History
In 1988, Silicon Graphics introduced the MIPS-based workstation computer, the Personal IRIS series. A few years later, IBM licensed both the graphics subsystem and the (then new) IRIS Graphics Library (IRIS GL) API for their RS/6000 POWERstation line of POWER1-based workstations. IrisVision was an unintended offshoot of SGI's attempts to port the subsystem to IBM's Micro Channel Architecture. They found it was much easier to debug the prototype implementations on an IBM PS/2.
To quote R.C. Brown:
- "At some point, the light went off in someone's head; "Why don't we sell this board set for use in PCs?". IrisVision was born. Initially, the MCA card was re-designed to offer some features critical for the PC market, including standard 15-pin VGA-style video output and a 15-pin VGA passthrough input connector. The IBM genlock connector was moved to the top of the card, and stereo display signals were also brought out to the VGA passthrough connector. The card occupied 1 32-bit MCA slot and an adjacent 16/32 bit slot. One or two daughter boards provided framebuffer and z-buffer memory.
- Work then began on the design of an Industry Standard Architecture (ISA or AT-bus) version of the card. It would occupy 2 16-bit ISA slots and use the identical daughter cards as the MCA (and IBM) versions of the board set."
Read more about this topic: Iris Vision
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