GSC is a bus used in many of the HP 9000 workstations and servers. The acronym has various explanations, including Gecko System Connect (Gecko being the codename of the 712 workstation), Gonzo System Connect and General System Connect.

GSC was a general 32-bit I/O bus, similar to NuBus or Sun's SBus, although it was also used as a processor bus with the PA-7100LC and PA-7300LC processors. Several variations were produced over time, the later ones running at 40 MHz:

GSC-1X

The original GSC bus implemented on PCX-L and used in the Gecko (712), Mirage (715) and Electra computers. Peak Bandwidth 142MB/s w/DMA, 106 MB/s with PIO writes.

GSC+, aka "Extended GSC" or "EGSC"

Enhancements added for KittyHawk/SkyHawk (U2 chip) that allow for pending transactions. GSC+ enhancements are orthogonal to the GSC-1.5X and GSC-2X enhancements.

GSC-1.5X

GSC-1X with an additional variable length write transaction.

GSC-2X

GSC-1.5X with a protocol enhancement to allow data to be sent at double the GCLK rate, with a peak bandwidth of 256 MB/s.

GSC could refer to:

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