Re: WTB: 64K cache SIMM (72-pin)
On 9/1/18 9:41 AM, Cameron Kaiser via cctalk wrote: > Is this actually a *non*-standard thing? it seems likely. I looked at the IDT and Micron 90's SRAM catalogs and the x32 stock sram modules they made are all 64 pin
Re: WTB: 64K cache SIMM (72-pin)
On Sat, 1 Sep 2018, Cameron Kaiser via cctalk wrote: > 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. I'd expect SRAM rather than DRAM on a cache SIMM. Cache memory is supposed to be fast after all. Otherwise why bother? -- caching only complicates things, so there has to be benefit in return. Maciej
Re: WTB: 64K cache SIMM (72-pin)
On September 1, 2018 9:41:37 AM PDT, Cameron Kaiser via cctalk 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
Re: WTB: 64K cache SIMM (72-pin)
> > 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." -
Re: WTB: 64K cache SIMM (72-pin)
On 8/31/2018 8:35 PM, Cameron Kaiser via cctalk 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? -Rick
WTB: 64K cache SIMM (72-pin)
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! -- personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckai...@floodgap.com -- Heisenberg may have been here. -
