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FWIW, 32-bit Windows 10 will still run 16-bit DOS programs.

Ahh

I don't see the delay lines either, but the picture isn't super high resolution.

I'm curious when your XT was made. Mine is from 1984 and the vertical walls on the outsides are half height. The one visible on the right side of your picture appears to be full height. Various adapter plates were used to help mount the disks in PCs. The center between the two bays, has holes...

Is it my imagination, or in the picture, does RN2 have a 4264 DRAM in the socket?

Here's my Jolt. My inheritance from a dear friend who passed away. He had it from new (and was responsible for that mess you see).

It does seem every time I buy chips, I then get a End-Of-Life notification.

Does this mean stuff like DIP packaged 74xx will be disappearing from Mouser, etc.?

With the camera at this angle the soldering and alignment looks good.

From that picture I wouldn't be surprised if you've got a short between pins on the CF socket.

I just received another board, a 386SX, with some Varta damage, and it's got cheesy SIMM sockets, too, with some physical damage.

Turbo Pascal, now that's a surprise!

I have used the technique of using a heavy copper wire (like solid 14 ga) and plenty of flux and solder, and a heavy iron tip, to successfully remove parts like DB-25 connectors from boards like the Xerox 820. I didn't think to use that on the 60 pins worth of dual SIMM sockets on the 386...

Yeah, I don't think removing 30-pin SIMM sockets (60 pins since they are sistered) is something I'll be doing again any time soon. If ever. I managed to accomplish what I wanted, w/o wrecking the motherboard. So I'm happy. In general, despite (or perhaps because of) having been doing this...

@GiGaBiTe I'm not recommending it either. But there was no way *I* was going to manage to unsolder those things without wrecking the board. Each socket is a dual, 60 pins, 8 of which go to a power or ground plane. I was never able to fully clear the solder properly from some of those ground...

Yes, IMHO, current modern Unicomp is not as good as the mid-'80s Model Ms that I've been using for decades.

I'll take it.

I'm not sure where I found this article, years ago. (but I've been using those 8085 instructions since Jesus was a little boy)

Microsoft did use the 8080 -> 8086 translator in their early work. So it did turn out to have an actual valid use.

One motherboard had some not-fully-decoded I/O ports and while scanning for something we managed to blow the Flash BIOS. That caused a lot of cussing.