16 Feb
2014
16 Feb
'14
10:16 p.m.
On Sun, Feb 16, 2014 at 4:14 PM, Charles
<charlesmorris800 at centurytel.net> wrote:
I have a hex-height (Omnibus) board in my junk box...
M8549 "Universal
Substitute Board". It has a few 10101 (ECL??) IC's. Here is a picture
of both sides.
http://s1181.photobucket.com/user/DrCharlesMorris/library/PDP-8
Anyone know what this is for, and any schematic info? I can't find it
on any module list.
ECL makes me think "PDP-10". The fact that it has signals on the "F"
finger tells me that it's not an OMNIBUS board - those use A-D for the
OMNIBUS itself, and memory cards/memory controllers can use the "E"
finger for the extra address lines. Nothing in a PDP-8 uses "F".
I don't have an exhaustive card list handy, but see what else shares
the M85xx range. Related boards often have sequential or
nearly-sequential handle numbers.
-ethan