On Nov 22, 2020, at 04:01 PM, Chris Hanson via cctalk <cctalk at classiccmp.org>
Does anyone know of anyone building them for sale? I dont need a real
PDP-8 in my life with all my other hardware (more Q-bus PDP-11, on the
other hand) but Id love having *a* PDP-8, especially one that doesnt
require enormous amounts of power.
There's a few options in this regard, in increasing degrees of
"realness" (and cost!) depending on how you define it.
1) The PiDP-8 by Oscar Vermeulen - Raspberry Pi based 8/i replica
running SIMH in a miniaturised case.
2) The SBC6120 - Originally by Spare Time Gizmos, but now re-released by
the RetroBrew Computers community. This is a 6120 based PDP-8/e replica,
with optional front panel. (the panel doesn't appear to be made
"officially" anymore, as the design files are missing, but a Russian
company appears to have copied it. (I have the Russian version but have
yet to assemble it.)
3) The LD12 / LD20 by Franklin Prosser and David E. Winkel -
This is a TTL based clone of a PDP-8/i, originally devised as part of an
exercise in the book "The Art of Digital Design An Introduction to Top
Down Design" in the early 80s. A few people on vcfed.org
their own based on these designs, and daver2 has made a run of PCBs
4) Vince Slyngstad of so-much-stuff.com
has scanned many PDP-8 boards
and re-created them in Eagle CAD software. I know he's been working on
re-creating the 8/e CPU recently but AFAIK it's not finished yet.
There are however many OMNIBUS peripheral cards, and a board that
combines 32KW of battery backed RAM with a boot ROM.
Roland Huisman has also re-created the RX8E floppy controller, and has
made an RX02 emulator to go with it, so if you lack an RX01/2 drive you
can still have something to boot off. Kyle Owen has also created a neat
bit of software that allows you to use a spare serial port and a *NIX
system to simulate an RK05.
So with all this, it should in theory be possible to build your own 8/e
class system soon enough if you can find all the parts for it.
mosst at sdf.org
SDF Public Access UNIX System - https://sdf.org