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If i remember correctly, this chip goes bad when disk drive connector is plugged incorrectly (in the Disk II drive at least)

You know, I just happen to have the manuals for the Mylex MI386 motherboard, if that's any help.

I can give 3.1 a try. This evening I tested without the cache card and it still failed. I installed a smaller set of SIMMs in the second bank and...

I checked your website to find out what the hell an MCM/70 is, but couldn't find it. It must be really something if it's now at #1 in your list. ...

My NetBSD IIci runs with 128MB of RAM. I can't imagine A/UX wouldn't, but stranger things. Maybe see if 3.1 does better than 3.0.1 (that's what I...

I don't have a huge collection yet(not enough to have a top ten rarest) but some interesting and rare electronics I own are: A Newtek Calibar A...

You miss what I said. The micro processor is executing the NOP instruction. It is driving the addresses, not the front panel. When you do a examine...

The 2nd model 100 arrive. It worked... case was nicotine covered. I took it apart and re-did 7 caps and the battery. Took the perfect case from #1...

The chip in question is "weird" in that it does not match any of the others. The chip I stole from bank 3 to fill in for this chip appears to be...

CGA_COMP turns on colorburst, so if it isn't working, no TSR will. That isn't logical. Of course one could be broken and not the other. ...

Except when fitted to the 16KB-64KB version of the 5150 motherboard, in which case, the diagnostics test to 64K, not 640K - see here]. Not...

I can try pulling the cache card. I'll also try installing some 1MB SIMMs in the second bank and see if I have the same issue. I did try...

Make me an offer

Unless I find it's something that can be fixed that's what I'll do. When I owned a IIfx as my main system I ran A/UX and only had 8MB so 64MB should...

My rarest machine I own is a Tandy Model 16. Its in excellent cosmetic shape and I'm planning on doing a full restoration starting in January of...

Good luck with that. I've found the InterWave chips are much more problematic to setup and operate vs a true GF1. I can see more than $250 for a...

As far as chips between CPU and RAM, look for ls244, ls245, and iirc ls373. There once was a full page pc/xt schematic, many years ago. I guess no...

Years ago, I bought a Minolta Dimage Scan Dual scanner and slowly worked my way through a couple hundred family slides. Some years went by there...

The extra long slot is probably for a memory upgrade card. Unfortunately, there was no standardization on these cards so it will be impossible to get...