Recent content by wrljet

People will be unearthing never-used Raspberry Pis in desk drawers for ages. I don't see those becoming collectible any time soon.

I'm aware of that.

I'm not going to give away my CAD work but I will create dimensioned drawings from it. Just not "overnight".

I wouldn't mind seeing the char ROM for the 3278 APL font.

https://docs.pcjs.org/manuals/intel/80286/80286_B2_B3_Errata-1984-11-21.pdf https://docs.pcjs.org/manuals/intel/80286/80286_C2_Errata-1984-11-21.pdf

Oh, I see what you meant! The 8088 is missing also.

What's the 4331 in this context? There's two rows of 9 DRAMs. Some have white labels that look like MK4332. The other ones look similar to the TI ones with two chips that were recently mentioned on this forum as being available from Electronic Goldmine.

Interesting article. I've seen those two pictures of the prototype planar board before and have thought about making up a semi-replica but never got around to it.

640K was 10 times as much as most of the older systems, though. That really ought to have been enough for anybody until the next new major breakthrough system came along.

Yes. And the address space just above that wasn't used until the VGA.

The 640K is from needing to put the video RAM and option ROMs *someplace*.

Which makes be wonder how the charge pump ckt in post #201 works. Because the negative bias supply is not present before the other voltages. It must not have been ultra critical.

What's the problem?

Bill Gates looks so young there.

Hi!