Can anyone ID these SEMI chips?

From: Richard Erlacher <>
Date: Mon Jul 12 09:03:41 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.

-----Original Message-----
From: Doug Coward <>
To: Discussion re-collecting of classic computers
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:
> 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 Coward (work)
>Sr. Software Eng. (home)
>Press Start Inc.
>Analog Computer Museum and History Center
Received on Mon Jul 12 1999 - 09:03:41 BST

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:32:11 BST