obably w/o memory), but not an AX08 -- so I
was looking for the most cost-effective means to replicate critical AX08
functionality ... and did so. It's been a long time.
-Original Message-
From: Chris Zach
Sent: Saturday, January 22, 2022 7:07 PM
To: pbir...@gmail.com; 'General D
There's a couple of MC8/L manuals on bitsavers, this might jog your memory.
http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/pdp8l/
Anyway, the timing seems to be for the read core, transfer into MB,
write back into core (because reads are destructive) then send the
completed signal.
0:10 PM
To: 'General Discussion: On-Topic and Off-Topic Posts'
Subject: Re: Building a BA08 for a pdp8/L
Hi Paul!
That is really interesting. Did you need to recreate the delay lines or any of
that circuitry, or was it just wire the NAND gates into the chip address matrix
and ignore all
Hi Paul!
That is really interesting. Did you need to recreate the delay lines or
any of that circuitry, or was it just wire the NAND gates into the chip
address matrix and ignore all the various TP1-TP4 states?
Looking at it I could probably build the basic circuitry on a large
breadboard, I
Not a direct answer Chris, but back in the mid-70's I built a BM8 surrogate the
hard way (we were an impoverished neurophysiology lab so cutting corners
wherever reasonable) using banks of 2102L and S100 RAM PCBs. For density I
piggy-backed the 2102's to get 8Kbyte boards, then 3 boards gave 16
