Can anyone ID these SEMI chips?

From: Dave Dameron <ddameron_at_earthlink.net>
Date: Mon Jul 12 16:48:33 1999

At 11:24 PM 7/11/99 -0700, Doug wrote:
>Hi everyone,

> 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?
>
I don't know that part number (a 4k dynamic ram like Intel 2107??), but the
company was "EMM Semi", a part of
Electronic Memories & Magnetics. They were in Phoenix, AZ.
-Dave
Received on Mon Jul 12 1999 - 16:48:33 BST