Look up hear in Wiktionary, the free dictionary.

Hear may refer to:

• to hear, as in Hearing, the ability to detect sound
• Hawaiian Ecosystems at Risk project
• Hear (album), an album by Diesel

See also[link]

• Hearing (disambiguation)
• Here (disambiguation)

This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.

MS-DOS

64px
An example of MS-DOS's command-line interface, this one showing that the current directory is the root of drive C.
Company / developer	Microsoft Corporation
Programmed in	Assembly language[1]
OS family	DOS
Working state	Discontinued/Historic
Source model	Closed source
Initial release	1981
Latest stable release	8.0 / September 14, 2000; 11 years ago  (2000-09-14)
Available language(s)	Multilanguage
Available programming languages(s)	C, Pascal, QBasic, Batch, etc.
Supported platforms	x86
Kernel type	Monolithic kernel
Default user interface	Command-line interface, Text user interface
License	Proprietary

MS-DOS ( /ˌɛmɛsˈdɒs/ EM-es-DOSS; short for Microsoft Disk Operating System) is an operating system for x86-based personal computers. It was the most commonly used member of the DOS family of operating systems, and was the main operating system for IBM PC compatible personal computers during the 1980s to the mid 1990s, until it was gradually superseded by operating systems offering a graphical user interface (GUI), in particular by various generations of the Microsoft Windows operating system.

MS-DOS grew from a 1981 request by IBM for an operating system for its IBM PC range of personal computers. Microsoft quickly bought the rights to QDOS (Quick and Dirty Operating System), also known as 86-DOS,^[2] from Seattle Computer Products, and began work on modifying it to meet IBM's specification. The first edition, MS-DOS 1.0, was launched in 1982.^[3] The version shipped with IBM's PCs was called PC DOS. Although MS-DOS and PC DOS were initially developed in parallel by Microsoft and IBM, the two products eventually went their separate ways.

During its life, several competing products were released for the x86 platform,^[4] and MS-DOS itself would go through eight versions, until development ceased in 2000. Ultimately it was the key product in Microsoft's growth from a programming languages company to a diverse software development firm, providing the company with essential revenue and marketing resources. It was also the underlying basic operating system on which early versions of Windows ran as a GUI.

History[link]

MS-DOS was a renamed form of 86-DOS – informally known as the Quick-and-Dirty Operating System or Q-DOS^[3] – owned by Seattle Computer Products, written by Tim Paterson.^[3] Microsoft needed an operating system for the then-new Intel 8086 but it had none available, so it bought 86-DOS for $75,000 and licensed it as its own then released a version of it as MS-DOS 1.0.^[3] Development started in 1981, and MS-DOS 1.0 was released with the IBM PC in 1982.^[3] (86-DOS, in turn, was a clone of Digital Research's CP/M (for 8080/Z80 processors), ported to run on 8086 processors and with two notable differences compared to CP/M, an improved disk sector buffering logic and the introduction of FAT12 instead of the CP/M filesystem. This became possible because of the increased availability of RAM compared to what was typically available when CP/M was designed originally.)

Originally MS-DOS was designed to be an operating system that could run on any 8086-family computer. Each computer would have its own distinct hardware and its own version of MS-DOS, similar to the situation that existed for CP/M, and with MS-DOS emulating the same solution as CP/M to adapt for different hardware platforms. To this end, MS-DOS was designed with a modular structure with internal device drivers, minimally for primary disk drives and the console, integrated with the kernel and loaded by the boot loader, and installable device drivers for other devices loaded and integrated at boot time. The OEM would use a development kit provided by Microsoft to build a version of MS-DOS with their basic I/O drivers and a standard Microsoft kernel, which they would typically supply on disk to end users along with the hardware. Thus, there were many different versions of "MS-DOS" for different hardware, and there is a major distinction between an IBM-compatible (or ISA) machine and an MS-DOS [compatible] machine. Some machines, like the Tandy 2000, were MS-DOS compatible but not IBM-compatible, so they could only run software written exclusively for MS-DOS without dependence on the peripheral hardware of the IBM PC architecture.

This design would have worked well for compatibility, if application programs had only used MS-DOS services to perform device I/O, and indeed the same design philosophy is embodied in Windows NT (see Hardware Abstraction Layer). However, in MS-DOS's early days, the greater speed attainable by programs through direct control of hardware was of particular importance, especially for games, which often pushed the limits of their contemporary hardware. Very soon an IBM-compatible architecture became the goal, and before long all 8086-family computers closely emulated IBM's hardware, and only a single version of MS-DOS for a fixed hardware platform was needed for the market. This version is the version of MS-DOS that is discussed here, as the dozens of other OEM versions of "MS-DOS" were only relevant to the systems they were designed for, and in any case were very similar in function and capability to the same-numbered standard version for the IBM PC, with a few notable exceptions.

While MS-DOS appeared on PC clones, true IBM computers used PC DOS, a rebranded form of MS-DOS. Ironically, the dependence on IBM-compatible hardware caused major problems for the computer industry when the original design had to be changed. For example, the original design could support no more than 640 kilobytes of memory (the 640 KB barrier), because IBM's hardware design reserved the address space above this limit for peripheral devices and ROM. Manufacturers had to develop complicated schemes (EMS and XMS, and other minor proprietary ones) to access additional memory. This limitation would not have been a problem if the original idea of interfacing with hardware through MS-DOS had endured. (However, MS-DOS was also a real-mode operating system, and the Intel x86 architecture only supports up to 1 MB of memory address space in Real Mode, even on Pentium 4 and later x86 CPUs, so for simple access to megabytes of memory, MS-DOS would have had to be rewritten to run in 80286 or 80386 Protected Mode.) Also, Microsoft originally described MS-DOS as "an operating system for Intel 8086-based microcomputers", and the 8086 CPU (and its cousin the 8088) itself has only 1 MiB of total memory address space.

Versions[link]

Microsoft licensed or released versions of MS-DOS under different names like Lifeboat Associates "Software Bus 86"^[5] aka SB-DOS,^[4] COMPAQ-DOS,^[5] NCR-DOS or Z-DOS^[4] before it enventually enforced the MS-DOS name for all versions but the IBM one, which was originally called "IBM Personal Computer DOS", later shortened to IBM PC DOS. (Competitors released compatible DOS systems such as DR-DOS and PTS-DOS that could also run DOS applications.)

The following versions of MS-DOS were released to the public:^[6][7]

• MS-DOS 1.x
  • Version 1.12 (OEM) - Compaq release of PC DOS 1.10
  • Version 1.19 (OEM)^[8] - Zenith OEM
  • Version 1.25 (OEM) - Microsoft repackaging of PC DOS 1.10
• MS-DOS 2.x - Support for 10 MB hard disk drives and tree-structure filing system
  • Version 2.0 (OEM)
  • Version 2.1 (OEM)
  • Version 2.11 (OEM)
  • Version 2.2 (OEM)
  • Version 2.21 (OEM)
• MS-DOS 3.x
  • Version 3.0 (OEM) - Support for FAT16
  • Version 3.1 (OEM) - Support for Microsoft Networks
  • Version 3.2 (OEM)
  • Version 3.21 (OEM)
  • Version 3.25 (OEM)
  • Version 3.3 (OEM)
  • Version 3.3a (OEM)
  • Version 3.3r (OEM)
  • Version 3.31 (OEM) - Compaq MS-DOS 3.31 supports FAT16B and larger drives.
  • Version 3.35 (OEM)
• MS-DOS 4.x - includes a graphical/mouse interface.
  • Version 4.00 (OEM)
  • Version 4.01 (OEM) - IBM patched Version 4.00 before Microsoft released it. First version to introduce volume serial number when formatting hard disks and floppy disks (Disk duplication also).^[9]
  • Version 4.01a (OEM)
• MS-DOS 5.x
  • Version 5.0 (Retail) - includes a full-screen editor. A number of bugs required reissue.
  • Version 5.0a (Retail) - With this release, IBM and Microsoft versions diverge.
  • Version 5.0.500 (WinNT) - All Windows NT 32-bit versions ship with files from DOS 5.0
• MS-DOS 6.x
  • Version 6.0 (Retail) - Online help through QBASIC. Disk compression and antivirus included.
  • Version 6.1 (none) - IBM and Microsoft alternate DOS 6 versions. IBM released 6.3 also.
  • Version 6.2 (Retail) - Scandisk as replacement for CHKDSK. Fix serious bugs in DBLSPACE.
  • Version 6.21 (Retail) - Stacker-infringing DBLSPACE removed.
  • Version 6.22 (Retail) - New DRVSPACE compression.
• MS-DOS 7.x
  • Version 7.0 (Win95,95A) - Support for VFAT long file names. New editor. JO.SYS is an alternative filename of the IO.SYS kernel file and used as such for "special purposes". JO.SYS allows booting from CD-ROM to hard disk.
  • Version 7.1 (Win95B-Win98SE) - Support for FAT32 file system. Last general purpose DOS to load Windows.
• MS-DOS 8.0
  • Version 8.0 (WinME) - Integrated drivers for faster Windows loading. Four different kernels (IO.SYS) observed.
  • Version 8.0 (WinXP) - DOS boot disks created by XP and later contain files from WinME. The internal command prompt still reports version 5.0

Microsoft DOS was released through the OEM channel, until DRI released DR-DOS 5.0 as a retail upgrade. With PC DOS 5.00.1, the IBM-Microsoft agreement started to end, and IBM entered the retail DOS market with IBMDOS 5.00.1, 5.02, 6.00 and PC DOS 6.10, 6.30, 7.00 and 2000.

A number of beta versions have surfaced on the Internet, such as 5.0 (a ten-diskette version in the same vein as 4.0), 7.00 beta 1 (based on 6.00), 7.00 beta 2 (based on 6.22). An OEM source package for 6.00, and a late release of 6.2(b) have also been seen. These are not retail versions.

Competition[link]

This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (April 2010)

On microcomputers based on the Intel 8086 and 8088 processors, including the IBM PC and clones, the initial competition to the PC DOS/MS-DOS line came from Digital Research, whose CP/M operating system had inspired MS-DOS. In fact, there remains controversy as to whether Q-DOS was more or less plagiarised from early versions of CP/M code. Digital Research released CP/M-86 a few months after MS-DOS, and it was offered as an alternative to MS-DOS and Microsoft's licensing requirements, but at a higher price. Executable programs for CP/M-86 and MS-DOS were not interchangeable with each other; much applications software was sold in both MS-DOS and CP/M-86 versions until MS-DOS became preponderant (later Digital Research operating systems could run both MS-DOS and CP/M-86 software). MS-DOS originally supported the simple .COM, which was modelled after a similar but binary incompatible format known from CP/M-80. CP/M-86 instead supported a relocatable format using the file extension .CMD to avoid name conflicts with CP/M-80 and MS-DOS .COM files. MS-DOS version 2.0 added a more advanced relocatable .EXE executable file format.

Most of the machines in the early days of MS-DOS had differing system architectures and there was a certain degree of incompatibility, and subsequently vendor lock-in. Users who began using MS-DOS with their machines were compelled to continue using the version customized for their hardware, or face trying to get all of their proprietary hardware and software to work with the new system.

In the business world the 808x-based machines that MS-DOS was tied to faced competition from the Unix operating system which ran on many different hardware architectures. Microsoft itself sold a version of Unix for the PC called Xenix.

In the emerging world of home users, a variety of other computers based on various other processors were in serious competition with the IBM PC: the Apple II, early Apple Macintosh, the Commodore 64 and others did not use the 808x processor; many 808x machines of different architectures used custom versions of MS-DOS. At first all these machines were in competition. In time the IBM PC hardware configuration became dominant in the 808x market as software written to communicate directly with the PC hardware without using standard operating system calls ran much faster, but on true PC-compatibles only. Non-PC-compatible 808x machines were too small a market to have fast software written for them alone, and the market remained open only for IBM PCs and machines that closely imitated their architecture, all running either a single version of MS-DOS compatible only with PCs, or the equivalent IBM PC DOS. Most clones cost much less than IBM-branded machines of similar performance, and became widely used by home users, while IBM PCs had a large share of the business computer market.

Microsoft and IBM together began what was intended as the follow-on to MS-DOS/PC DOS, called OS/2. When OS/2 was released in 1987, Microsoft began an advertising campaign announcing that "DOS is Dead" and stating that version 4 was the last full release. OS/2 was designed for efficient multi-tasking — an IBM speciality derived from deep experience with mainframe operating systems — and offered a number of advanced features that had been designed together with similar look and feel; it was seen as the legitimate heir to the "kludgy" DOS platform.

MS-DOS had grown in spurts, with many significant features being taken or duplicated from Microsoft's other products and operating systems. MS-DOS also grew by incorporating, by direct licensing or feature duplicating, the functionality of tools and utilities developed by independent companies, such as Norton Utilities, PC Tools (Microsoft Anti-Virus), QEMM expanded memory manager, Stacker disk compression, and others.

During the period when Digital Research was competing in the operating system market some computers, like Amstrad PC1512, were sold with floppy disks for two operating systems (only one of which could be used at a time), MS-DOS and CP/M-86 or a derivative of it. Digital Research produced DOS Plus, which was compatible with MS-DOS 2.11, supported CP/M-86 programs, had additional features including multi-tasking, and could read and write disks in CP/M and MS-DOS format.

While OS/2 was under protracted development, Digital Research released the MS-DOS compatible DR-DOS 5, which included features only available as third-party add-ons for MS-DOS (and still maintained considerable internal CP/M-86 compatibility). Unwilling to lose any portion of the market, Microsoft responded by announcing the "pending" release of MS-DOS 5.0 in May 1990. This effectively killed most DR-DOS sales until the actual release of MS-DOS 5.0 in June 1991. Digital Research brought out DR-DOS 6, which sold well until the "pre-announcement" of MS-DOS 6.0 again stifled the sales of DR-DOS.

Microsoft had been accused of carefully orchestrating leaks about future versions of MS-DOS in an attempt to create what in the industry is called FUD (fear, uncertainty, and doubt) regarding DR-DOS. For example, in October 1990, shortly after the release of DR-DOS 5.0, and long before the eventual June 1991 release of MS-DOS 5.0, stories on feature enhancements in MS-DOS started to appear in InfoWorld and PC Week. Brad Silverberg, Vice President of Systems Software at Microsoft and General Manager of its Windows and MS-DOS Business Unit, wrote a forceful letter to PC Week (November 5, 1990), denying that Microsoft was engaged in FUD tactics ("to serve our customers better, we decided to be more forthcoming about version 5.0") and denying that Microsoft copied features from DR-DOS:

"The feature enhancements of MS-DOS version 5.0 were decided and development was begun long before we heard about DR-DOS 5.0. There will be some similar features. With 50 million MS-DOS users, it shouldn't be surprising that DRI has heard some of the same requests from customers that we have." – (Schulman et al. 1994).^[10]

The pact between Microsoft and IBM to promote OS/2 began to fall apart in 1990 when Windows 3.0 became a marketplace success. Much of Microsoft's further contributions to OS/2 also went in to creating a third GUI replacement for DOS, Windows NT.

IBM, which had already been developing the next version of OS/2, carried on development of the platform without Microsoft and sold it as the alternative to DOS and Windows.

Legal issues[link]

As a response to Digital Research's DR DOS 6.0, which bundled SuperStor disk compression, Microsoft opened negotiations with Stac Electronics, vendor of the most popular DOS disk compression tool, Stacker. In the due diligence process, Stac engineers had shown Microsoft part of the Stacker source code. Stac was unwilling to meet Microsoft's terms for licensing Stacker and withdrew from the negotiations. Microsoft chose to license Vertisoft's DoubleDisk, using it as the core for its DoubleSpace disk compression.^[11]

MS-DOS 6.0 and 6.20 were released in 1993, both including the Microsoft DoubleSpace disk compression utility program. Stac successfully sued Microsoft for patent infringement regarding the compression algorithm used in DoubleSpace. This resulted in the 1994 release of MS-DOS 6.21, which had disk-compression removed. Shortly afterwards came version 6.22, with a new version of the disk compression system, DriveSpace, which had a different compression algorithm to avoid the infringing code.

Prior to 1995, Microsoft licensed MS-DOS (and Windows) to computer manufacturers under three types of agreement: per-processor (a fee for each system the company sold), per-system (a fee for each system of a particular model), or per-copy (a fee for each copy of MS-DOS installed). The largest manufacturers used the per-processor arrangement, which had the lowest fee. This arrangement made it expensive for the large manufacturers to migrate to any other operating system, such as DR DOS. In 1991, the U.S. government Federal Trade Commission began investigating Microsoft's licensing procedures, resulting in a 1994 settlement agreement limiting Microsoft to per-copy licensing. Digital Research did not gain by this settlement, and years later its successor in interest, Caldera, sued Microsoft for damages. It was believed that the settlement ran in the order of $150m, but was revealed in November 2009 with the release of the Settlement Agreement to be $280m.^{[citation needed]}

Use of undocumented APIs[link]

Microsoft also used a variety of tactics in MS-DOS and several of their applications and development tools that, while operating perfectly when running on genuine MS-DOS (and PC DOS), would break when run on another vendor's implementation of DOS. Notable examples of this practice included:

• Microsoft's QuickPascal released in early 1989 was the first MS product that checked for MS-DOS by modifying the program's Program Segment Prefix using undocumented DOS functions, and then checked whether or not the associated value changed in a fixed position within the DOS data segment (also undocumented). This check also made it into later MS products, including Microsoft QuickC v2.5, Programmer's Workbench and Microsoft C v6.0.^[10]
• The (once infamous) AARD code, a block of code in the Windows 3.1 beta installer. It was XOR encrypted, self-modifying, and deliberately obfuscated, using various undocumented DOS structures and functions to determine whether or not Windows really was running on MS-DOS.^[10]
  • Note that the Windows 3.0 beta code only gave a warning that Windows would not operate properly on a "foreign" OS. It did in fact run just fine on DR-DOS 6.0.
• Interrupt routines called by Windows to inform MS-DOS that Windows is starting/exiting, information that MS-DOS retained in an IN_WINDOWS flag, in spite of the fact that MS-DOS and Windows were supposed to be two separate products.^[10]

End of MS-DOS[link]

In 2011, MS-DOS is still used in some enterprises to run legacy applications, such as this US Navy food service management system.

Today, MS-DOS is rarely used for desktop computing. Since the release of Windows 95, it was integrated as a full product used for bootstrapping, troubleshooting, and backwards-compatibility with old DOS games and no longer released as a standalone product.

Windows XP contains a copy of the Windows Me boot disk, stripped down to bootstrap only. This is accessible only by formatting a floppy as an "MS-DOS startup disk". Files like the driver for the CD-ROM support were deleted from the Windows ME bootdisk and the startup files (AUTOEXEC.BAT and CONFIG.SYS) no longer had a content. This modified disk was the base for creating the MS-DOS image for Windows XP. Some of the deleted files can be recovered with an undelete tool.^[12] With Windows Vista the files on the startup disk are dated 18 April 2005 but are otherwise unchanged, including the string "MS-DOS Version 8 © Copyright 1981-1999 Microsoft Corp" inside COMMAND.COM.

However the only versions of DOS currently recognized as stand-alone OSs, and supported as such by the Microsoft Corporation are DOS 6.0 and 6.22, both of which remain available for download via their MSDN, volume license, and OEM license partner websites, for customers with valid login credentials.

MS-DOS is still used in embedded x86 systems due to its simple architecture and minimal memory and processor requirements. The command line interpreter of NT-based versions of Windows, cmd.exe, maintains most of the same commands and some compatibility with DOS batch files.

Windows command-line interface[link]

All versions of Microsoft Windows have had an MS-DOS like command-line interface (CLI). This could run many DOS and variously Win32, OS/2 1.x and Posix command line utilities in the same command-line session, allowing piping between commands. The user interface, and the icon up to Windows 2000, followed the native MS-DOS interface.

Consumer Windows (up to 3.11, Win9x, WinME) ran as a Graphical User Interface (GUI) running on top of MS-DOS. With Windows 95, 98, and ME the MS-DOS part was integrated, treating both operating systems as a complete package. The command line accessed the DOS command line (usually command.com), through a Windows module (winoldap.mod).

A new line of Windows, (Windows NT), boot through a kernel whose sole purpose is to load Windows. One can not run Win32 applications in the loader system in the manner that OS/2, UNIX or Consumer Windows can launch character mode sessions.

The command session permits running of various supported command line utilities from Win32, MS-DOS, OS/2 1.x and POSIX. The emulators for MS-DOS, OS/2 and POSIX use the host's window in the same way that Win16 applications use the Win32 explorer. Using the host's window allows one to pipe output between emulations.

The MS-DOS emulation is done through the NTVDM (NT Virtual DOS Machine). This is a modified SoftPC (a former product similar to VirtualPC), running a modified MS-DOS 5 (ntio.sys and ntdos.sys). The output is handled by the console DLLs, so that the program at the prompt (cmd.exe, 4nt.exe, tcc.exe), can see the output. Command.com passes most of its commands down to the underlying processor (cmd.exe, 4nt.exe, ...), but is generally not used. If you need commands that rely on TSR programs, you must launch these from command.com. 64-bit Windows does not have either the DOS emulation, or the DOS commands (edit, debug, edlin, kbd16), that come with 32-bit Windows.

The DOS version returns 5.00 or 5.50, depending on which interrupt is used to determine it. Utilities from MS-DOS 5.00 run in this emulation without modification. The very early beta programs of NT show MS-DOS 30.00, but programs running in MS-DOS 30.00 would assume that OS/2 was in control.

The OS/2 emulation is handled through OS2SS.EXE and OS2.EXE, and DOSCALLS.DLL. OS2.EXE is a version of the OS/2 shell (cmd.exe), which passes commands down to the OS2SS.EXE, and input-output to the Windows NT shell. Windows 2000 was the last version of NT to support OS/2. The emulation is OS/2 1.30.

POSIX is emulated through the POSIX shell, but no emulated shell: the commands are handled directly in CMD.EXE.

The Command Prompt is often called the MS-DOS prompt. In part, this was the official name for it in Windows 9x and early versions of Windows NT, and in part because the SoftPC emulation of DOS redirects output into it. Some purists object to this name, because the underlying binaries are Win32 console applications, rather than DOS programs. This confusion does not exist under OS/2 because there are separate DOS and OS/2 prompts, and running a DOS program under OS/2 will launch a separate DOS window to run the application.

All versions of Windows for x86-64 and Itanium architectures no longer include the NTVDM and can therefore no longer natively run MS-DOS or 16-bit Windows applications. There are alternatives in the form of Virtual machine emulators such as Microsoft's own Virtual PC, as well as VMware, DOSBox, and others.

Legacy compatibility[link]

From 1983 onwards, various companies worked on graphical user interfaces (GUIs) capable of running on PC hardware. With DOS being the dominant operating system several companies released alternate shells, e.g. Microsoft Word for DOS, XTree, and the Norton Commander. However, this required duplication of effort and did not provide much consistency in interface design (even between products from the same company).

Later, in 1985, Microsoft Windows was released as Microsoft's first attempt at providing a consistent user interface (for applications). The early versions of Windows ran on top of MS-DOS and its clones. At first Windows met with little success, but this was also true for most other companies' efforts as well, for example GEM. After version 3.0 (1990), Windows gained market acceptance.

Later versions (Windows 95, Windows 98 and Windows Me) used the DOS boot process to launch into protected mode. Basic features related to the file system, such as long file names, were only available to DOS when running as a subsystem of Windows. Windows NT ran independently of DOS but included a DOS subsystem so applications could run in a virtual machine under the new OS. With the latest Windows releases, even dual-booting MS-DOS is problematic as DOS may not be able to read the basic file system.

Related systems[link]

Single-user[link]

Several similar products were produced by other companies. In the case of PC DOS and DR-DOS, it is common but incorrect to call these "clones". Given that Microsoft manufactured PC DOS for IBM, PC DOS and MS-DOS were (to continue the genetic analogy) "identical twins" that diverged only in adulthood and eventually became quite different products. Although DR-DOS is regarded as a clone of MS-DOS, the DR-DOS versions appeared months and years before Microsoft's products. (For example, MS-DOS 4, released in July 1988, was followed by DR-DOS 5 in May 1990. MS-DOS 5 came in April 1991, with DR-DOS 6 being released the following June. MS-DOS 6 did not arrive until April 1993, with Novell DOS 7, DR-DOS' successor, following the next month.^[13]) What made the difference in the end was Microsoft's control of the Windows platform and their programming practices which intentionally made Windows appear as if it ran poorly on competing versions of DOS.^[10] Both IBM (DOS 5.02) and DRI (DOS 6 update) had to release interim releases to circumvent Windows limitations inserted artificially,^[10] designed specifically to provide Microsoft with an unfair competitive advantage.^[10]

• PC DOS,
• DR-DOS / Novell DOS / OpenDOS,
• GNU/DOS / FreeDOS / FreeDOS 32,
• PTS-DOS.

These products are collectively referred to as DOS. However, MS-DOS can be a generic reference to DOS on IBM-PC compatible computers.

See also[link]

• Bad command or file name
• Comparison of x86 DOS operating systems
• DOSKey, MS-DOS utility
• History of Microsoft Windows
• List of DOS commands
• List of Microsoft Windows versions
• List of MS-DOS games
• Microsoft Windows
• MS-DOS API
• Timeline of x86 DOS operating systems
• Win32 console - a text-rendering system akin to MS-DOS
• 4DOS - designed to replace the default command interpreter COMMAND.COM
• DOSBox

Quotations[link]

"IBM wanted CP/M prompts. It made me throw up." -- Tim Paterson^[14]

Notes[link]

References[link]

Microsoft. MS-DOS 6 Technical Reference

External links[link]

Wikibooks has a book on the topic of Basic Computing Using Windows/Appendices/Dual Booting

• MS-DOS Resources - Information on various aspects of MS-DOS including downloads
• Current License Agreement Policies for MS-DOS and Windows
• Tim Paterson on DOS - Paterson wrote the QDOS OS
• MS-DOS: A Brief Introduction
• Richard Bonner's DOS website
• Batfiles - the DOS batch file programming handbook and tutorial
• Arachne graphical browser for DOS
• MS-DOS Reference
• Linux/dosemu
• Ralf Brown's Interrupt List
• DOS command overview
• DOSBox, a multiplatform DOS emulator
• Garbo - An MS-DOS program distribution library at the University of Vaasa, Finland
• MS-DOS 6 Technical Reference at Microsoft TechNet
• Promotional video for MS-DOS 5
• List of all released Microsoft Operating Systems and betas

Katy Perry
Katy Perry at the Logie Awards in 2011
Background information
Birth name	Katheryn Elizabeth Hudson
Also known as	Katy Hudson
Born	(1984-10-25) October 25, 1984 (age 27) Santa Barbara, California, U.S.
Genres	Pop, rock, dance, gospel
Occupations	Singer-songwriter, actress
Instruments	Vocals, guitar, piano
Years active	2001–present
Labels	Red Hill, Island, Columbia, Capitol
Associated acts	The Matrix
Website	Katyperry.com

Katheryn Elizabeth Hudson^[1] (born October 25, 1984), known by her stage name Katy Perry, is an American singer, songwriter and actress. Perry grew up with gospel music, and during her first year of high school she pursued a music career as Katy Hudson, releasing her first studio album called Katy Hudson which failed to chart. She recorded a solo album later, which was never released. After signing with Capitol Music Group in 2007, her fourth record label in seven years, she adopted the stage name Katy Perry.

She first gained recognition with the release of her first mainstream album, One of the Boys in 2008, which spawned three Billboard Hot 100 top-ten songs—"I Kissed A Girl", "Hot n Cold" and "Waking Up In Vegas". Perry supported the album with her Hello Katy Tour. In 2010, her third studio album, Teenage Dream (2010), which topped the Billboard 200 chart, and spawned five number one singles—"California Gurls", "Teenage Dream", "Firework", "E.T." and "Last Friday Night (T.G.I.F.)"—Teenage Dream was the only album (after Michael Jackson's Bad)—to do so, and the first female in history to achieve this milestone. She embarked on the California Dreams Tour, which grossed nearly $60 million worldwide.^[2] Perry re-released the album under the name of Teenage Dream: The Complete Confection on March 26, 2012, and the re-release has already spawned the number-one single "Part of Me".

Perry is the only artist to spend over 52 consecutive weeks in the top ten of the Billboard Hot 100, and has since heightened this to 69 weeks.^[3] As of 2012, Perry has been nominated for eight Grammy Awards. She was named 2011's "Artist of the Year" by MTV.^[4] She has sold 37.6 million digital tracks in the United States and 11 million albums worldwide.^[5] Perry was a guest judge on the seventh series of The X Factor UK and the ninth season of American Idol. She has released fragrances "Purr" and "Meow". She ventured into film, voicing Smurfette in the 2011 film The Smurfs. Perry was married to British comedian Russell Brand from 2010 to 2012.

Early life[link]

Perry was born Katheryn Elizabeth Hudson in Santa Barbara, California^[6] to Keith, a West Coast scenester in the 1960s,^[7] and Mary Hudson (née Perry), an evangelist who grew up in Southern California and had a "tempestuous" first marriage in Zimbabwe.^[7] Perry has Portuguese, German, Irish, and English ancestry.^[8][9][10] She is the second child of two pastors.^[11] She has an older sister named Angela Hudson and younger brother named David Hudson.^[12] Perry's mother's aunt and uncle were screenwriter Eleanor Perry and director Frank Perry.^[7] Perry was incorporated into her parents' ministry^[11] and sang in their church between the ages of 9 and 17.^[13] She grew up listening to gospel music,^[14] was not allowed to listen to what her mother called "secular music",^[13][15] and attended Christian schools and camps.^[11] As a child, Perry learned how to dance in a recreation building in Santa Barbara. She was taught by seasoned dancers and began with swing, Lindy Hop, and jitterbug.^[16] She took her GED after her first year at Dos Pueblos High School and decided to leave school in the pursuit of a career in music.^[17] Perry initially started singing "because [she] was at that point in [her] childhood where [she] was copycatting [her] sister and everything she [would do]."^[17] Her sister practiced with cassette tapes, while Perry took the tapes herself when her sister was not around. She rehearsed the songs and performed them in front of her parents, who suggested she take vocal coaching. She grabbed the opportunity and began taking lessons at the age of nine and continued until she was sixteen. She later enrolled in at the Music Academy of the West in Santa Barbara, and studied Italian opera for a short period of time.^[17]

Career[link]

1999–2006: Career beginnings[link]

Perry performing on her guitar, an instrument she learned to play when she was just starting her record career

When Perry was 15, her singing in church attracted the attention of rock veterans from Nashville, Tennessee, who brought her there to polish her writing skills.^[18] In Nashville, Perry started recording demos and was taught by country music veterans how to craft songs and play guitar.^[13][15] Perry signed to the Christian music label Red Hill, under which she recorded her first album at the age of 15.^[19] Performing as Katy Hudson, she released a self-titled gospel rock album in 2001.^[18] She supported this album with The Strangely Normal Tour, accompanied by Phil Joel, LaRue, Luna Halo, Earthsuit and V*Enna.^[20] The album was unsuccessful as the label ceased operations at the end of 2001.^[19] She later changed her surname to Perry, her mother's maiden name, because "Katy Hudson" was too close to film actress Kate Hudson.^[18][21]

Perry performs at the 2008 Warped Tour

At the age of 17, Perry left her home for Los Angeles, where she worked with Glen Ballard on an album for Island Records.^[22] Growing up listening to mostly gospel music, Perry had few references when she began recording songs.^[13] Asked by the producer with whom she would like to collaborate, Perry had no idea. That night, she went with her mother to a hotel. Inside, she turned on VH1 and saw producer Glen Ballard talking about Alanis Morissette;^[13] Ballard produced Morissette's Jagged Little Pill, which had a "huge influence" on Perry.^[18] She expressed interest in working with Ballard to her initial collaborator, who arranged a meeting for her with Ballard in Los Angeles. Perry presented one of her songs to Ballard. Ballard then helped Perry develop her songwriting over the next few years.^[13] The album was due for release in 2005,^[18][19] but Billboard reported it also went nowhere.^[19] Perry was dropped by The Island Def Jam Music Group.^[7] Some of Perry and Ballard's collaborations included "Box", "Diamonds" and "Long Shot", were posted on her official MySpace page. "Simple", one of the songs she recorded with Ballard, was released on the soundtrack to the 2005 film The Sisterhood of the Traveling Pants.^[23][24] "Long Shot" and "I Do Not Hook Up" was later recorded by Kelly Clarkson for her 2009 album All I Ever Wanted.^[25]

Perry signed to Columbia Records in 2004. However, the label was not amenable with her vision, not putting her in the "driver's seat".^[19] Instead, one of Columbia's ideas was to pair Perry with the record production team The Matrix, who was working on an album, to serve as its female vocalist. Although the album was later shelved,^[26] she caught the attention of the music press: Her burgeoning music career led to her being named "The Next Big Thing" in October 2004 by Blender magazine.^[19] With no album project ongoing, Perry began recording her own. Eighty percent completed, however, Columbia decided not to finish it and dropped her from the label.^[19] While waiting to find another label, she worked in an independent A&R company called Taxi Music. In 2006, Perry was featured in the tail-end of the video to P.O.D.'s single "Goodbye for Now".^[27] She made a cameo appearance in Carbon Leaf's video, "Learn to Fly".

[edit] 2007–09: Commercial success with One of the Boys and MTV Unplugged

While in the process of being dropped by Columbia in 2006, the company's publicity executive Angelica Cob-Baehler enthusiastically recommended Perry to Virgin Records chairman Jason Flom.^[28] At the time Flom was leading a complete revival in fortunes at the label and looking to crown recent achievements by breaking a global pop act.^[28] Despite mixed reactions from fellow Virgin executives, Flom became convinced that Perry could be that breakthrough star, and at the start of 2007 extended discussions with Columbia resulted in Perry signing to the newly created Capitol Music Group, a merger between Virgin and Capitol. As part of the deal, the label secured the masters to the unfinished album, recorded while at Columbia, that would go on to form a significant part of her official mainstream debut album, One of the Boys.^[28]

The Columbia recordings were seen by Flom as being "very strong but lacking an undeniable smash or two that would work both at U.S. pop radio and internationally" and so one of the executive's first actions after completing the signing was to set up a collaboration between Perry and the writer-producer Dr. Luke.^[28] The results were the songs "I Kissed a Girl" and "Hot n Cold". Establishing her image was one of the immediate concerns of her management.^[19] A campaign was started in November 2007 with the release of the video to "Ur So Gay", aimed at introducing her to the music market. A digital EP led by "Ur So Gay" was later released to create online buzz and press story.^[11][19][29] This was a successful move that resulted in bringing Perry to the attention of Madonna,^[19] who mentioned her on KISS FM and KRQ's JohnJay & Rich morning show in Arizona. On March 10, 2008, she appeared as herself on the ABC Family television series, Wildfire, on the episode "Life's Too Short".^[30]

Perry during Hello Katy Tour on March 27, 2009

In the next step of promoting the album, Perry undertook a two-month tour of radio stations. The album's official lead single, "I Kissed a Girl", was released on May 6, 2008. Perry's A&R, Chris Anokute, told HitQuarters the song and its controversial theme had met with strong resistance at the label: "People said, 'This is never going to get played on the radio. How do we sell this? How’s this going to be played in the bible belt?'"^[29] Anokute said that they needed the support of one of the label's radio promoters to convince people to believe in the record; otherwise, Perry would have likely been dropped again. Capitol's SVP of Promotions, Dennis Reese, saw the vision and helped push the single on national radio. The first station to pick it up and take a chance was The River in Nashville. After playing it for three days they were innundated with enthusiastic calls.^[29] With the song climbing atop the charts, Perry embarked on the annual Warped Tour music festival, which her management used to "establish her as a credible performer and make sure she wasn't seen as just a one-hit wonder."^[19] The single was a commercial success, peaking at number one for seven weeks on the Billboard Hot 100.^[19] It has since become a major worldwide hit, topping charts in 30 countries,^[26] including Australia, Canada, and the United Kingdom.^[31] On June 12, 2008, Perry appeared as herself on the daytime soap opera The Young and the Restless,^[30] posing for the cover to the June 2008 issue of the fictional magazine Restless Style.^[32] Perry also performed backing vocals on the song, "Another Night in the Hills" from Gavin Rossdale's 2008 solo album Wanderlust.^[33]

One of the Boys was released on June 17, 2008, to mixed critical reviews.^[34] The album has reached number nine on the Billboard 200,^[35] and has been certified platinum by the Recording Industry Association of America.^[36] Perry released her second single, "Hot n Cold", which became her second top three single in dozens of countries around the world, including the United States where it reached number three on the Billboard Hot 100,^[19] as well as topping the charts in Germany, Canada, and Denmark. After Perry wrapped up her appearance at the Warped Tour, she went on tours in Europe. She later launched her first headlining tour, the Hello Katy Tour, in January 2009.^[19] "I Kissed a Girl" earned Perry a nomination for Best Female Pop Vocal Performance at the 2009 Grammy Awards.^[37] Perry was nominated in five categories at the 2008 MTV Video Music Awards, including Best New Artist and Best Female Video, but lost to Britney Spears.^[38] She won Best New Act at the 2008 MTV Europe Music Awards, which she co-hosted,^[39] and Best International Female Artist at the 2009 BRIT Awards.^[40] On February 9, 2009, both "I Kissed a Girl" and "Hot n Cold" were certified three-time platinum by Recording Industry Association of America for individual digital sales of over three million.^[41] The Guinness Book of World Records recognized Perry in its 2010 version as the "Best Start on the US Digital Chart by a Female Artist," for having her first two singles sell over two million digital copies.^[42]

Perry during the Hello Katy Tour in June 2009

The Matrix's self-titled debut album, which features Perry, was later released via the team's label, Let's Hear It, during Perry's solo tour. When the release date was scheduled, "I Kissed a Girl" had been charting well. Matrix member Lauren Christy spoke to Perry about the decision, but she wanted to hold the release until the fourth single of One of the Boys had been dispatched. Despite their communication, The Matrix was released on January 27, 2009, via iTunes Store.^[43]

In December 2008, Perry apologized to British singer Lily Allen for remarks in which she called herself a "skinnier version" of her, saying she meant it as a joke.^[44] Allen retaliated and told a British radio station that she "happen[ed] to know for a fact that she [Perry] was an American version" of her because their record company needed "to find something controversial and 'kooky'" like her.^[45] In January 2009, Perry embarked on her first headlining world tour, the Hello Katy Tour, visiting North America, Europe, Asia, and Australia. Beginning on January 23, 2009, and ending on November 28, 2009, the tour consisted of 89 concerts. During that time, Perry also opened select concerts for the band No Doubt, on their Summer Tour 2009.

On May 16, 2009, Perry performed at the opening ceremony of the annual Life Ball in Vienna, Austria.^[46] In June 2009, lawyers acting for Perry opposed the then-recent trademark of Australian fashion designer Katie Perry, who uses her own name to market loungewear.^[47] Some media outlets reported this as a lawsuit, which Perry denied on her blog.^[48] Katie Perry reported on her blog that at a hearing with IP Australia on July 10, 2009, the singer's lawyers withdrew their opposition to the trademark.^[49] During the summer of 2009 Perry filmed a cameo appearance for Get Him to the Greek; her scene, in which she kisses her future fiancé Russell Brand was cut, and does not appear in the final film. Discussing the issue with MTV, Perry hypothesized there may have been some fear that seeing the two make out would have taken viewers out of the experience.^[50] In 2009, Perry was featured on two singles: in August, a remix of Colorado-based band 3OH!3's song "Starstrukk" (the idea for the collaboration having come after Perry's tour that featured 3OH!3 as the supporting act, the song being released by iTunes on September 8, 2009); and, thereafter, in December, on "If We Ever Meet Again", the fourth single from Timbaland's album Shock Value II.^[51] In October 2009, MTV Unplugged revealed that Perry was one of the artists to perform for them, and that she would be releasing a live album of the performance, including two new tracks, "Brick by Brick" and Fountains of Wayne cover "Hackensack".^[52] The album, released on November 17, included both a CD and a DVD,^[53] and debuted at No. 168 on the US Billboard 200 chart.

[edit] 2010–present: Teenage Dream, film debut and The Complete Confection

Perry at 2011 MTV Video Music Awards

Perry appeared as a guest judge alongside Simon Cowell, Cheryl Cole and Louis Walsh during the Dublin audition stage of the seventh series of the British television show The X Factor on June 28, 2010.^[54] She was one of the many celebrities chosen to fulfil the role of judge whilst Dannii Minogue was on maternity leave. In May 2010, Perry released the first single from her second studio album, Teenage Dream entitled, "California Gurls". The single peaked at number one on the Billboard Hot 100 for six consecutive weeks.^[55][56] "Teenage Dream" was released as the second single from her album, and it also topped the Billboard Hot 100, becoming her third number one and second from the album. Teenage Dream was released August 24, 2010 and debuted atop the Billboard 200 chart with sales of 192,000 copies in its first week.^[57] The album as since sold over 2 million copies in the US, being certified Platinum by the RIAA. Following the album's release, the third single "Firework" was released and became the third consecutive single from Teenage Dream to top the Hot 100. With this, Perry became the first female in eleven years to have three consecutive number-ones from one album.^[58] In February 2011, Perry released the fourth single, "E.T.", a remixed version featuring Kanye West, that peaked at number one on the Billboard Hot 100 for five non-consecutive weeks.^[59] The music video for "E.T." was directed by Floria Sigismondi and features Shaun Ross as the main love interest. With "E.T." at number one on the chart of May 12, 2011, Perry became the first artist to spend 52 consecutive weeks in the top 10 of the Billboard Hot 100.^[3] In June 2011, Perry released the fifth single, "Last Friday Night (T.G.I.F.)". A remixed version featuring American rapper Missy Elliot was released in early August.^[60] The song topped the Billboard Hot 100 on August 17, 2011, making Perry the first female and second artist (tied with Michael Jackson) ever to have five No. 1 singles from one album. Also, when the song reached number 1 in the Pop Songs airplay chart, "Teenage Dream" became the first album to have 5 number 1's from the same album on that chart. Additionally, when the song reached number one in the Adult Pop Songs airplay chart, the album become the first to have 4 number 1's from the same album on the chart.^[61] In October 2011, Perry released the sixth single, "The One That Got Away". It reached No. 3 on Hot 100, becoming the third album in history to produce six top five hit singles,^[62] and the seventh song from Teenage Dream to reach the top of the Billboard Hot Dance Club Songs, the most by any album and setting a new record in the chart.^[63] Perry released a "The One That Got Away" remix featuring American rapper B.o.B. in December 2011. An acoustic version of the song was released in January 2012.^[64]

From February 2011 to January 2012, Perry embarked on an extensive world tour in support of Teenage Dream, the California Dreams Tour, playing 124 shows in Europe, Australasia, Asia, North America and South America and earning over $59 million.^[2] Perry made her perfume debut, releasing a fragrance named "Purr" in November. It is packaged in a cat-shaped bottle, and is available through Nordstrom stores.^[65][66] She followed it up with the fragrance's first flanker, "Meow".^[67][68]

Perry promoting her 2011 fragrance 'Purr'

In July 2011, Perry made her film debut in the 3D family film The Smurfs as Smurfette. The Smurfs earned $557,771,535 worldwide during its theatrical run. Perry appeared at the 2011 MTV Video Music Awards on August 28, 2011. She was nominated for ten awards, received the most nominations of the ceremony and was the first singer to have four different music videos shown in various categories, eventually winning three of those, Video of the Year for "Firework", Best Collaboration and Best Special Effects for "E.T.". On September 17, 2011, marked Perry' 69th consecutive week in the Top 10 with single "Last Friday Night (T.G.I.F.)".^[69][70] On September 23, 2011, she performed, along with Elton John, Brazilian Claudia Leitte and friend Rihanna, on the opening day of the 2011 Rock in Rio festival, which was extended to October 2.^[71] Perry performed for 100 thousand people, a show that received high praise from critics and audience alike.^[72]

On December 14, 2011, the annual list Forbes was elected the third singer who earned more than US$44 million, behind Lady Gaga (US$90 million) and Taylor Swift (US$45 million).^[73] On December 15, 2011, Perry was elected the Artist of the Year by MTV, for their performance on the charts worldwide and won the record during the year.^[4] On December 20, 2011, She released a Barbie doll that represents her style in 2012.^[74] On January 8, 2012, Perry was named the sixth best-selling digital artist of all time in the United States, having sold 37,620,00 million singles and albums as of 2011, according to Nielsen SoundScan.^[75]

In the week ending January 15, 2012, Perry became the first artist ever to have five songs sell over 5 million digital copies in the USA.^[76] Perry was once again recruited by EA Games to promote their new expansion pack The Sims 3: Showtime for their The Sims game franchise. The game content was based on Perry.^[77] Perry became the first person to have six songs top the Billboard Adult Pop Songs chart.^[78] In March 27, 2012, she re-released Teenage Dream under the title Teenage Dream: The Complete Confection on March 27, 2012. The lead single from the re-release (and seventh single from the Teenage Dream era overall) was "Part of Me", which released in February, debuted atop the Billboard Hot 100 chart.^[79] Perry has announced that she will release a part-biopic, part-concert film to be shown in 3D titled Katy Perry: Part of Me to be released on the 4th of July weekend of 2012 by Paramount Pictures.^[80][81] In April 2012, Perry performed in India for the first time at the opening ceremony of 5th edition of Indian Premier League, cricket match, in Chennai along with Indian actors Amitabh Bachchan, Salman Khan, Kareena Kapoor, Priyanka Chopra and Prabhu Deva.^[82][83][84] She performed her songs "Teenage Dream" and a remix version of "California Gurls".^{[85][83][86][87]} In April 2012, Perry stated that she was working on new music and changing her musical style, "My music is about to get real f—ing dark. You'd never see my face because my hair would be in it."^[88]

Artistry[link]

Musical style and themes[link]

Perry performing in 2009

Perry has a contralto vocal range.^[89] Perry's first album is of the Gospel music genre.^[11][19] She related that her perspective in music was "a bit enclosed and very strict", and everything she did was church-related.^[11] Her second album, One of the Boys, is described as "secular" and "rock," and reflects a departure from her religious musical roots.^[11] Her next album Teenage Dream featured more pop songs in the vein of Boys.^[16][90] In her childhood, Perry was introduced to the music of Alanis Morissette and Freddie Mercury, the late frontman of the British band Queen.^[26] In her tribute to Mercury on what would have been his 65th birthday, Perry stated; "Without you I wouldn't be making music or doing what I do because your lyrics inspired me as a 15 year old girl."^[91] Queen's song "Killer Queen" has inspired her to pursue a career in pop music after her first album.^[11] She also described that Morissette's album Jagged Little Pill as having influenced her music profoundly; even going on to work with Morissette's collaborator on the album, Glen Ballard because of that.^[18] Influence also came from a number of female pop rock singers, including Cyndi Lauper, Shirley Manson, Pat Benatar and Joan Jett, as "they came out with a vengeance."^[92] Perry also cited Madonna as another big influence, saying "I want to evolve like Madonna."^[93][94]

	"Part of Me" noicon A 22 second sample of Part of Me, a song with a pop rock influence, which is a common genre for Perry's songs.
Problems listening to this file? See media help.

Perry is artistically involved in her projects, especially in the writing process. Since she could play guitar, she would start writing songs at home and present it to her producers. Perry is mostly inspired by specific moments of her life. She said it is easy for her to write songs about heartbreak.^[13] Most of the themes in One of the Boys deal with heartbreak, teen adventure, and "puking into toilets".^[18] Perry's mother reportedly told British tabloid Daily Mail that she dislikes her daughter's music, calling it "shameful and disgusting".^[11][95] Perry said her mother was misquoted and told MTV that it was false information.^[95] Her songs "Ur So Gay" and "I Kissed a Girl" have received negative reactions from both religious and gay sectors.^[95] The songs have been respectively labeled as being homophobic and promoting homosexuality, as well as "lez ploitational".^[11] Musicians Pink, Kathleen Hanna and Beth Ditto criticized "I Kissed A Girl" as offensive to the LGBT community.^[96][97][98] MTV mentioned criticism suggesting that Perry is using "bi-curiosity" as a way to sell records.^[95] Perry responded to the controversy surrounding "Ur So Gay": "It's not a negative connotation. It's not, 'you're so gay,' like, 'you're so lame,' but the fact of the matter is that this boy should've been gay. I totally understand how it could be misconstrued or whatever ... It wasn't stereotyping anyone in particular, I was talking about ex-boyfriends."^[99] Perry has written several songs for other singers, including Ashley Tisdale ("Time's Up"), Selena Gomez & the Scene ("Rock God" and "That's More Like It"), Kelly Clarkson ("Long Shot" and "I Do Not Hook Up"), Jessica James ("Bullet" and "Girl Next Door"), Lesley Roy ("Slow Goodbye"), and Kady Malloy ("Wish You the Worst").

Public image[link]

Perry is known for her unconventional style of dress.^[16] It is often humorous, bright in color, and reminiscent of different decades, and she frequently uses fruit-shaped accessories, mainly watermelon, as part of her outfits.^[92] Perry's transformation into an artist began with fashion, inspired by American film actress Dominique Swain's portrayal in the 1997 film Lolita.^[18] She defines her fashion style as "a bit of a concoction of different things".^[16] Her fashion has caught the attention of designers.^[11][92] In June 2008, a publicity photo that showed Perry posing with a switchblade was criticized.^[100] The picture was defended as only an effort to give Perry a "sexy, harder edge".^[100] The criticism leveled at her was mocked by Perry who subsequently posed with a spoon instead.^[101] She was ranked 7th in Rolling Stone's global Queen of Pop poll in July 2011.^[102] Perry is also a gay activist. According to Dosomething.org, Perry had stated "I am a gay activist and I say that proudly. I voted no on Prop 8 (California’s Nov. 4, 2008, amendment declaring that marriage is defined as a union solely between a man and a woman), of course."^[103]

Personal life[link]

Russell Brand, Perry's estranged husband

Perry has had relationships with Gym Class Heroes frontman Travie McCoy, whom she met in a recording studio in New York,^[21] breaking up in December 2008;^[104] Relient K frontman Matt Thiessen, with whom she worked on her album Teenage Dream^[105] and British comedian Russell Brand.

Perry first met Brand in the summer of 2009 when she filmed a cameo appearance for Brand's film Get Him to the Greek. Although the cameo ultimately did not make it into the final cut of the movie, Perry later noted that the "scene called for me to make out with him...And on the way down the stairs after the scene, I was hopping like a bunny. I hop like a bunny when I'm happy".^[106][107] Perry and Brand began dating after meeting again several months later in September 2009 at the 2009 MTV Video Music Awards, where Brand, as host, remarked, "Katy Perry didn't win an award and she's staying at the same hotel as me, so she's gonna need a shoulder to cry on. So in a way, I'm the real winner tonight."^[108] The couple became engaged in December 2009 while vacationing in India.^{[109][110][111]} At the time, Perry stated that she had plans to take dual British citizenship. "One of the first things I'll do is apply for dual citizenship. I'm not too sure if I have to take a test as I've not had time to look into it. But England is like my second home".^[112] In an August 2010 interview with Rolling Stone, Perry also noted that, "I am sensitive to Russell taking the Lord's name in vain and to Lady Gaga putting a rosary in her mouth. I think when you put sex and spirituality in the same bottle and shake it up, bad things happen."^{[113][114][115]} Perry and Brand married on October 23, 2010, in a traditional Hindu ceremony near the Ranthambhore tiger sanctuary in Rajasthan, India, the same location where Brand proposed.^[116][117]

After 14 months of marriage, Brand filed for divorce from Perry on December 30, 2011, in Los Angeles, citing irreconcilable differences.^[118][119] The announcement of the divorce followed media speculation that the couple was having marital problems, including an Us Weekly report that they had got into a "massive fight" and spent Christmas 2011 on opposite sides of the globe, with Perry in Hawaii and Brand in London, both without their wedding rings.^[120][121] After Perry and Brand reached an agreement on financial issues, a judge granted the divorce request in February 2012; however the divorce will not become effective until July 2012, as California law requires a six-month interval from the initial filing.^[122]

Discography[link]

• Katy Hudson (2001)
• One of the Boys (2008)
• Teenage Dream (2010)

Tours[link]

Filmography[link]

Awards and nominations[link]

References[link]