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 <mranalog_at_home.com>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
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_at_pressstart.com (work)
>Sr. Software Eng. mranalog_at_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
>====================================================
Received on Mon Jul 12 1999 - 09:03:41 BST