On September 1, 2018 9:41:37 AM PDT, Cameron Kaiser via cctalk <cctalk@classiccmp.org> wrote: >> > Trying to restore an Alpha Micro ColdFire-based system, and it's >missing >> > its cache SIMM. It works without it, but it sure would be nice. AM >doesn't >> > have much info on it but it appears to be a 72-pin 64KB SIMM >(unknown >> > speed), same keying as 72-pin RAM SIMMs. >> > >> > I doubt this is a custom part and ISTR that PCs of around that time >used >> > something similar. If you've got something like this mouldering in >your >> > parts drawer, please advise. Thanks! >> > >> I have three devices which if I remember right were cache modules, >but >> they all appear to be 80 pin devices. >> Slightly longer pins than the typical 72-pin SIMMs, fit into a >vertical >> socket on the MB. Any chance you've got the pin count wrong? > >An excellent question, but it is exactly the same socket as the 72-pin >RAM >SIMMs below it. I even labouriously counted all the pins on the board >socket >this morning just in case I'd missed something, and it's 72. The >service >manual even warns against installing RAM there. > >Is this actually a *non*-standard thing? I know Apple had all kinds of >boffo >L2 cache configurations for the beige Power Macs but Apple's Apple and >certainly larger than Alpha Micro. > >-- >------------------------------------ personal: >http://www.cameronkaiser.com/ -- >Cameron Kaiser * Floodgap Systems * www.floodgap.com * >ckai...@floodgap.com >-- Seen on hand dryer: "Push button for a message from your >congressman." -----
I had a regular Pentium motherboard with cache like that. The manual describes this as COAST for Cache On A Stick. The actual SIMM has gold fingers that are much longer than the ones found on regular DRAM SIMMs. I curiously tried putting a regular SIMM into a COAST slot and vice versa. It didn't work because of this length difference. -- David Griffith d...@661.org
