Follow

Treasure hunt victory. Just found a DEC F-11 CPU from Shenzhen. The second-generation of LSI-11, PDP-11 on a chip.

· · Web · 2 · 8 · 27

Just received the DEC F-11 CPU from my previous treasure hunt. This is the chip that powered the second generation of LSI-11 machines, including PDP-11/23 and PDP-11/24. Now I'm a proud owner of a PDP-11 on a chip.

You can still find some in the USA, but I never expected to find one in China. But not surprising, I can imagine that someday, somewhere in Guiyu, a container full of scrapped industrial equipment arrived, one of them was a PDP-11 (or perhaps only a KDF11 CPU board), it was sold as scrap metal and got scavenged here.

en.wikipedia.org/wiki/Electron

More treasure hunt victory from Shenzhen: Intersil IM-6100, IM-6100A and Harris HD-6120 CPUs - PDP-8-on-a-chip! Also known as "CMOS-8s".

@roytam1 J-11 has extensive chip-level documentation, but F-11 is more difficult, I only found system-level documentation and schematics for the KDF-11 CPU board. If I cannot find anything better, it's necessary to work backward from schematics.

@roytam1 Yep, I saw that one too. Need to do some "reverse-engineering" (in quote marks) from the schematics.

@niconiconi I think it might be easier to find USSR clones than genuine one in China.

@roytam1 I really want to get some USSR clones, the problem is all the documentation is in Russian.

@phooky I guess the selling point here was 12-bit ADC interfacing.

@niconiconi at various points I've been very tempted to buy one of the soviet PDP-11-on-a-chip designs on ebay

@izaya I'd love to buy them but I can't read Russian datasheets...

@niconiconi @izaya I wonder if @rin might know someone who knows russian, is into retrocomputing, and could help

@kumicota @wolf480pl @niconiconi @rin there's the bonus hurdle of the fact that most of them I've seen are in cursed packages like QIP28, with two rows of 14 pins on either side.
Sign in to participate in the conversation
Cybrespace

cybrespace: the social hub of the information superhighway jack in to the mastodon fediverse today and surf the dataflow through our cybrepunk, slightly glitchy web portal support us on patreon or liberapay!