On Tue, Oct 9, 2018 at 5:14 PM Ethan Dicks via cctalk <cctalk@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 >