Can anyone ID these SEMI chips? - test-drb@ccmp.vtda.org

12 Jul 1999

EMM SEMI made a number of odd-shaped (as compared with more conventional
configurations of the time) staticc memories back in the late '70's -early
'80's.  These don't particularly ring a bell, though the 256x8 seems to
sound about right.  I haven't seen any literature lately. perhaps someone
with a recent IC master will have more.

Dick
-----Original Message-----
From: Doug Coward &lt;mranalog(a)home.com&gt;
To: Discussion re-collecting of classic computers
&lt;classiccmp(a)u.washington.edu&gt;
Date: Monday, July 12, 1999 12:41 AM
Subject: Can anyone ID these SEMI chips?

...
 Hi everyone,
 I'm curious about identifing some chips.
I have was appears to be a memory board made by "EMM".
It also appears to be Q-bus, at least the power and
ground seem to be in the right places to be Q-bus.
Anyway, the board has 64 of these chips, and looking
at the interconnection between chips, they appear to
be arranged in 2 groups of 32. The chips are labeled:

  SEMI
 4200ACC
  7733

 These are 22 pin chips, made in 1977, but I can't
seem to find any chip manufacturer named SEMI or
any reference to this 4200 number.

 Can anyone identify these chip?

Thanks in advance,
--Doug
====================================================
Doug Coward           dcoward(a)pressstart.com (work)
Sr. Software Eng.     mranalog(a)home.com (home)
Press Start Inc.      http://www.pressstart.com
Sunnyvale,CA

Curator
Analog Computer Museum and History Center
http://www.best.com/~dcoward/analog
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