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Many HP printers take 72-pin SIMMs ("PS/2" SIMMs). What does that mean? This depends upon the kind of printer you may have. Some need SIMMs with parity, some can take SIMMs with or without parity (SIMMs w/o parity are quite a bit cheaper). The SIMM wants parity. Real parity, not "fake" (computed) parity. The SIMM needs to be FPM, 70ns or faster. EDO memory will work in some printers, however not all. The Presence Detect pads must be linked accurately. N.B.: HP's half numbers for parity SIMMs are C2065A and C2066A (4MB and 8MB respectively). The SIMM does not want parity. The SIMM needs to be FPM, 70ns or quicker. EDO memory will work in some printers, however not all. The Presence Detect pads have to be linked correctly. N.B.: HP's half numbers for non-parity SIMMs are C3132A, C3133A and C3146A (4MB, 8MB and Memory Wave Experience 16MB respectively). There seem to be a number of part numbers for 32MB SIMM, I have seen D2298A, D3578A and KTH-NPVEC/32.

FPM stands for "Fast Page Memory". That is an outdated memory sort, often found at 70ns or 80ns. Something 60ns or faster stands a good likelihood of being EDO, although there is 60ns FPM memory. You can not tell FPM and EDO Memory Wave Experience apart by simply wanting on the module; although you can lookup the half variety of the memory chips used and see whether or not they are FPM or EDO memory. To inform memory with parity aside from memory with out parity, merely depend the variety of memory chips on the module. If it has 9 or 18 memory chips, all alike, it has parity. If it has four or eight or 16 memory chips, all alike, it doesn't have parity. If your module has 8/sixteen (unlikely to be 4) memory chips and then another 1/2 chips that aren't memory (however most likely "in line" with the memory chips, like this: MMMMcMMMM), then it more than likely has computed parity slightly than real parity and Memory Wave won't work in a printer that wants parity.

What appears to be like like a parity module would possibly even be ECC, though; so ensure what you're getting earlier than you get it. Relating to EDO SIMMs: Whether this works relies upon in your printer mannequin. Critically although, we have now had experiences of successful use, Memory Wave and experiences of unsuccessful use. The memory controller has to help EDO if there's to be any probability of it working. With older printer models, that might be not the case. Mixing FPM and EDO is discouraged, as a result of it's not stable at what was thought-about excessive memory access pace in these days. Nonetheless, since HP says "80ns or slower", we don't necessarily see an issue in utilizing EDO, as long as it really works: Even though the constructed-in memory might be FPM, and thus you're mixing. ECC memory is error-correcting memory and will never work in a HP printer, although it is going to bodily fit. Relating to speed: 70ns or faster means you may take a 60ns SIMM, encode it as 70ns, and it will work.

We have efficiently carried out this. HP actually quotes 80ns, or "80ns or slower", but we wish to be very conservative about this type of thing. SIMMs you buy these days can be 60ns, anyway. Proper. Pads (or pins, when you so will) 67 to 70 on a 72-pin SIMM encode the dimensions and velocity of that SIMM. Every of them can both be open or linked to GND (floor). Have a look at a SIMM you took out of your Laptop. Chances are high you will see traces operating from pads 67 to 70 to empty points where a solder blob or SMD resistor would fit. Pc clones, as a rule, do not use the Presence Detect pads on a SIMM. That's why the pads are (usually) left unsoldered. Furthermore, there is no standard for the encoding of those pads. IBM has their own method, as does HP, as does Dell, as do others.