Saturday, 28 March 2015 09:35

IBM 72X8287

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Unknown onboard IBM chip.


Inmos IMSG171P-35 is 35MHz Ramdac designed to be compactible with IBM PS/2 VGA graphics systems. Datasheet is here. So i guess it can be part of IBM PS/2 motherboard with 1st vga chipset or XGA 1. Questions are: is it silver chip really graphics core or it ended with rest of motherboard in recycled stuff? (got it as you see it), chipset name, source computer name, memory size/type, year.

Vlask's chip:

IBM 72X8287
IBM 72X8287
IBM 72X8287
IBM 72X8287 output
IBM 72X8287 output
IBM 72X8287 output

Additional Info

  • Made by: IBM
  • Codename: unknown
  • Bus: Integrated
  • Card Type: VGA
  • Manufacturer: IBM
  • Owned by: Vlask (chip/not working)
  • Outputs: 15 pin D‐sub
  • Sold by: IBM
  • Ramdac (MHz): 35
Read 9065 times Last modified on Saturday, 28 March 2015 10:57


# RE: IBM 72X8287Lee 2016-02-11 19:49
Apparently, IBM's 8-bit VGA for older machines used the 72X8287, so my guess is that this is the original (manufactured by IBM Microelectronics), and the 15F6864 is essentially the same thing, but manufactured on a cheaper process (note the all-plastic package and Epson "mountain" logo).

These are all basic VGAs that support 256k of RAM, 25.175 and 28.322 clocks, and 640x480 max.

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