12 Feb
2010
12 Feb
'10
7:17 p.m.
Jeff Walther wrote:
Anyone have a datasheet for the MCM62940 (MCM62940AFN14) static RAM? It's
not strictly off topic, as it's from the 256K level 2 cache of a computer
from the mid-90s (NuBus PPC Macintoshes).
The usual web searches have failed me. I thought I had downloaded it
years ago, but it turns out I only collected the datasheet for the TAG
SRAM and not for the cache chips.
This is particularly interesting because one can get 4000 of the chips
(soldered to boards) for about $50.
<http://eshop.macsales.com/item/Motorola/CACHE256M500PK/>
I have a couple of projects in mind where they might be useful. On the
other hand, they do take up a lot of board real estate (about .75"
square).
I have the Motorola 1995 Fast Static RAM databook, containing the datasheet for
the MCM62940A and B devices.
32K * 9 BurstRAM
Synchronous Static RAM
with Burst Counter and Self-Timed Write
I can:
- send you the entire databook for the cost of shipping from
Vancouver, B.C. (happy to send it somewhere it will be useful)
- send you a photocopy of the relevant pages,
or scan if I can get near a scanner in the near future,
- extract some pertinent data to you.