9 Oct
2018
9 Oct
'18
5:54 p.m.
On Tue, Oct 9, 2018 at 5:14 PM Ethan Dicks via cctalk <cctalk at classiccmp.org>
wrote:
Hi, All,
I asked a version of this question earlier this year. I have not been
able to find any vintage machines that used these 16Kx1 55ns SRAMs.
Anyone recognize them? Lots of them for sale on eBay. Probably few
buyers. One would want to know which systems used them, thus my
question.
They probably would have been excellent in a DEC MOS memory board but
I have no evidence they were used thusly. Contemporary DRAMs were
cheap and 64Kx1 so that's what was in consumer gear.
Anyone? Fast SRAM? Anywhere?
The Three Rivers PERQ used 48 of them for microcode store in the 16K CPU,
and on the Z80-based IO Processor. (I suspect the IO Processor didn't need
RAMs quite that fast, but 3RCC probably had a lot of them on hand due to
their use in the main CPU...)
- Josh
There's little point in wiring 8 of them up into a byte vs using a
62256 except for speed. 55ns is faster than any 8MHz machine really
needs (100ns-150ns was typical for those depending on bus
architecture). I could see these being cache RAM for a minicomputer
vs primary RAM.
-ethan