Intel i750

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The Intel i750 is a two-chip graphics processing unit composed of the 82750PB pixel processor and 82750DB display processor.

Although Intel had made earlier chips targeting graphics (e.g., 82786 graphics coprocessor), this was seen as Intel's first attempt to break into the video controller marketplace. The effort was a failure and led to Intel leaving the market for some time. The Indeo video compressor was originally built to work with the i750, but was later ported to other systems as well.

The 82750PB pixel processor is packaged in a 132-pin PQFP running at 25 MHz. It contains 57 instruction set, eight entries 64 bit vector registers(same MM0~MM7 register naming that mapped on x87 stack, only different is i750 has dedicate register while the x86 mmx cpu did not included. However it is lacked of integer general purpose register makes it different than its x86 counterpart.), an 64-bit ALU, a 512×48-bit instruction RAM, a 512×16-bit data RAM, two internal 16-bit buses, a wide instruction word processor, a variable length sequence decoder, a pixel interpolator and an interface supporting a 4 GB linear address space. These features make it capable of text, 2D and 3D graphics, video compression, and real-time video decompression and video effects. It can support up to 30 frames per second.

The 82750DB display processor supports variable bits per pixel, pixels per line, and pixel widths allowing trading-offs in image quality vs. refresh rate and VRAM requirements.

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References[edit]

  • Manepally, R.; Sprague, D. (1991). "Intel's i750 (R) video processor-the programmable solution". COMPCON Spring '91 Digest of Papers. pp. 324–329. doi:10.1109/CMPCON.1991.128825. ISBN 0-8186-2134-6. 
  • 82750PB Pixel Processor, Specification. Intel Corporation. February 1991. 
  • 82750DB Display Processor, Specification. Intel Corporation. February 1991.