CP/M-86

CP/M-86 was a version of the CP/M operating system that Digital Research (DR) made for the Intel 8086 and Intel 8088. The system commands are the same as CP/M-80. Executable files used the relocatable .CMD file format (the same filename extension .CMD is used by Microsoft Windows for unrelated batch files). Digital Research also produced a multi-user multitasking operating system compatible with CP/M-86, MP/M-86, which later evolved into Concurrent CP/M-86. When an emulator was added to provide PC DOS compatibility, the system was renamed Concurrent DOS, which later became Multiuser DOS. The DOS Plus, FlexOS, and DR DOS families of operating systems started as derivations of Concurrent DOS.

IBM PC

When IBM contacted other companies to obtain components for the IBM PC, the as-yet unreleased CP/M-86 was its first choice for an operating system because CP/M had the most applications at the time. Negotiations between Digital Research and IBM quickly deteriorated over IBM's non-disclosure agreement and its insistence on a one-time fee rather than DRI's usual royalty licensing plan. After discussions with Microsoft, IBM decided to use 86-DOS (QDOS), a CP/M-like operating system that Microsoft bought from Seattle Computer. Microsoft adapted it for PC, and licensed it to IBM. It was sold by IBM under the name of PC DOS. When PC-clones came about, other companies sold it under the name of MS-DOS. After learning about the deal, Digital Research founder Gary Kildall threatened to sue IBM for infringing DRI's intellectual property, and IBM agreed to offer CP/M-86 as an alternative operating system on the PC to settle the claim.

M86

M86 or M-86 may refer to:

M-86 (Michigan highway)

M-86 is an east–west state trunkline highway in the US state of Michigan in the southern portion of the Lower Peninsula. The highway starts at Business US Highway 131 (Bus. US 131) and M-60 in Three Rivers and ends at US Highway 12 (US 12) near Coldwater. In between, it crosses farm country and runs along a section of the Prairie River. Following a highway originally numbered M-7, the roadway was renumbered M-86 in 1940. It has been a part of the state highway system at least since 1927. Two other roadways carried the M-86 designation in the 1920s. Two bridges along the road are eligible for inclusion on the National Register of Historic Places (NHRP).

Route description

M-86 begins in Three Rivers at a junction with Bus. US 131 and M-60. From there the road travels south out of town on Main Street and across the St. Joseph River. After crossing the river, the highway runs through a residential area of town and turns eastward into rural farm lands. M-86 crosses the Prairie River and follows Burr Oak Street into the community of Centreville. The highway switches to follow Main Street through downtown Centreville; east of downtown, Main Street curves along a bend in the river, and it runs parallel to the river out of town. As part of its support of the state highway system, the Michigan Department of Transportation (MDOT) tracks the traffic levels along the roads it maintains. These traffic counts are expressed in terms of average annual daily traffic (AADT), a calculation of the vehicles using a segment of roadway on a typical day of the year. In 2009, MDOT measured 7,642 vehicles including 138 trucks along M-86 in Centreville, the highest traffic levels along the whole highway. As the highway leaves town, it passes by the north side of Lake Templene, and Sand Lake near Nottawa before meeting M-66.