28 Feb
2018
28 Feb
'18
1:42 a.m.
On Tue, Feb 27, 2018 at 8:44 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
Hi, all,
I'm going through a box of random ICs...
The IC is a 20-pin ceramic body with side brazed legs, gold pins, chromed
lid, with NEC D2168D on it with "-2" painted on the ceramic and date codes
from 1984. It's almost certainly a RAM chip of some kind, but I'm not
finding any pinouts or data sheets.
I found more parts of a similar nature which helped untangle this...
It appears to be the same configuration as the Mitsubishi M5M2167S,
which was easier to find. A document somewhere pointed me to the full
part number of my initial search of uPD2167D (the "uP" on the front
made all the difference).
16Kx1 55ns SRAM (-2 variant), 20 pins, crossed with Fujitsu and Intel
2167 parts, and the Inmos IMS1400.
Still don't know what vintage machines this might have appeared in.
Anyone know?
-ethan