90X8941: Listed only on the 8580-Axx planar - I also have one on a Model 30 286 with the single 40-pin EPROM planar, so also likely pin-compatible
Possibly Japanese origins?
ramping up for the PS/55 series. The Model 30 and PC Convertible share some BIOS calls - MCGA and VGA development needs to be probed further, although Eric delidding the early MCGA Gate Array chip showed IBM markings inside.Possibly Japanese origins?
I've stated before that I think Seiko-Epson Japan got connected to IBM for the PC Convertible (static RAM and the BIOS chips are marked with their logo) with the flat-panel flailings. IBM bought a TFT plant from Seiko-Epson, although it is viewed as
I envision a pinout diagram of the chips - at least I think it will be that IBM developed the 72X8287 chip (making video standards was nothing new for them) and turned it over to Seiko-Epson for line production. The models with which versions of thechips are installed - and date-code decoding - can be definitive too. Let's get started!
...And then some 55 SX, 65 SX, 70 T2, and maybe other PS/2 planars.
72X8287: The "metal-can" version on the Model 80 'Type 2' planar and 8-bit VGA adapter for the Model 30 - This is the only IBM VGA chip that isn't (PQFP) plastic and with a Seiko-Epson marking to top
Evil Dave, what are the date codes for the VGA ASICs?
If I understand your Delphic utterance, there are only TWO metal capped
VGA, the 8580 Type 2 system board -AND- the Model 30 [ISA] VGA adapter.
From DIMM memories, VGA would be on all 8525, 8530, 60, 65, 70, and 80.
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