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I’ve seen the 64 color EGA demo floating around recently. I may have a copy on my old laptop. I’ll have a look. I’m pretty sure I tested this on a 5154 at some point and it worked..:but I was likely using an EGA Wonder.

Pentium 75/90/100/120 had "boxed" versions. Not sure exactly when these appeared, but probably sometime in 1995. These are the first boxed CPUs from Intel I remember seeing. Apparently the FDIV bug replacement P60s also came in box of some sort, but it wasn't really a retail product as far as I...

They do actual video, though not at a very good resolution or framerate. You could adjust the video to postage stamp size on slow systems to "speed" things up a bit. I think in '97 I bought a Connectix Quickcam VC (just before they were sold to Logitech). It was for a K6-200 system I had just...

Mounting flour drives in an original IBM XT is a complete mess. You really needed the 1985/86 version to do it correctly. I think the 1985/1986 versions all came with an additional mounting point on the bottom of the chassis. That helped stop the drives from sliding around. But to make it all...

Does the the more compact later revision of this card still need the module to be compatible with the compaq portable? I was under the impression it did not.

The chip names on this board seems to correspond to ones found in the C&T CS8220 chipset...except that chipset only has five chips, and this one has six. You forgot to include the 82C202 which is in DIP package. Although not mentioned in the datasheet, I think the 82C206 on this chipset was...

The date codes on the motherboard components are from late '87 and early '88, so it doesn't seem to be a prototype. The speculation that this might have been produced after the original stockpile of boards ran out is probably correct. Have the BIOS chips on this thing been dumped yet? Any...

Not really sure what is meant by "plain IDE". I think I heard there exist IDE CD-ROM drives that are not ATAPI, though I've never encountered one. Perhaps this is what the poster is looking for?

It's easy enough to know if the cache timings can be adjusted or not...just check in the CMOS setup. It's not like we're dealing with exotic stuff here. AMI Color BIOS and OPTi 491 are pretty well understood. I used to buy cache memory on eBay, but this was many years ago. People I talk to...

I checked the part numbers for those cache chips. They really are 35ns. https://www.datasheetbank.com/pdf-view/MS62256A-Mosel-Vitelic For a 33MHz 486, that's pretty rough. Normally at 33MHz, nothing slower than 20ns is used. It would be unfortunate to alter the original condition of this...

Maybe it's just my imagination, but is the cache memory really 35ns? That seems awfully slow for a 486. I think the slowest I've ever seen is 25ns.

The grill on this thing sure is weird. It gives the illusion that something heavy caused the left side of the case of cave in.

Unfortunately, I don't own this board. The seller who had it already sold it to someone else, and I probably won't be able to find out who the new owner is. I had heard that the IBM AT had sold in France quite a bit later than in North America, so it's possible that the XT-286 continued on past...

I recently came across some photos of an XT286 which I initially thought had an aftermarket motherboard installed due the presence of an integrated chipset. However, on closer inspection the board appears to be manufactured by IBM. Unlike normal 5162 boards it has no SIMM slots and four rows of...

On this motherboard, are the ISA slots running off the same clock as the CPU? If you run in de-turbo mode (I assume 6 or 8MHz), does the data corruption problem go away?

Did you hear a little ringy dingy? On the ESS cards, even if you don't have SB16 compatibility, you can still use WSS which is 16-bit. From what I understand the 16-bit samples used in a lot of games were of very low quality anyway. Some of the clone cards were pretty solid. I second ESS.

This computer also appears to have no L2 cache. Adding it will be hard since it uses one of those weird Intel cache modules. Maybe an AMD 5x86 would be the way to go, since at least you'll have 16kb L1 to work with.

The 40MHz one is the one you need to replace. I'd desolder it, and put a socket in its place, that way you can revert back easily if need be. If just stepping the bus speed up to 25MHz, it's unlikely that you'll be running anything very far out of spec. 8MHz is usually what ISA runs at, but...

The clock signal should come either from a crystal oscillator or a clock generator. If you have sufficient soldering skills, it's probably possible to modify the board for a 25 or 33MHz bus.