HP Printer Memory - Hp Laserjet, Designjet And Hp Colour Printer Memory Improve > 자유게시판

Many HP printers take 72-pin SIMMs ("PS/2" SIMMs). What does that mean? This relies on the sort of printer you've gotten. Some need SIMMs with parity, some can take SIMMs with or with out parity (SIMMs w/o parity are rather a lot cheaper). The SIMM needs parity. Real parity, Memory Wave not "faux" (computed) parity. The SIMM needs to be FPM, 70ns or sooner. EDO memory will work in some printers, but not all. The Presence Detect pads should be related 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 must be FPM, 70ns or faster. EDO memory will work in some printers, however not all. The Presence Detect pads should be related accurately. N.B.: HP's part numbers for non-parity SIMMs are C3132A, C3133A and C3146A (4MB, 8MB and 16MB respectively). There appear to be several half numbers for 32MB SIMM, I have seen D2298A, D3578A and KTH-NPVEC/32.

FPM stands for "Quick Web page Memory". This is an outdated memory sort, Memory Wave Routine often found at 70ns or 80ns. Anything 60ns or sooner stands an excellent likelihood of being EDO, although there may be 60ns FPM memory. You can not inform FPM and EDO memory apart by simply wanting on the module; though you'll be able to search for the part variety of the memory chips used and see whether or not they are FPM or EDO memory. To inform memory with parity other than memory with out parity, simply count the variety of memory chips on the module. If it has 9 or 18 Memory Wave Routine chips, all alike, it has parity. If it has four or 8 or 16 memory chips, all alike, it doesn't have parity. In case your module has 8/sixteen (unlikely to be 4) memory chips and then one other 1/2 chips that aren't memory (however probably "in line" with the memory chips, like this: MMMMcMMMM), then it most certainly has computed parity somewhat than actual parity and won't work in a printer that wants parity.

What seems to be like a parity module would possibly even be ECC, though; so ensure what you are getting earlier than you get it. Concerning EDO SIMMs: Memory Wave Whether or not this works relies upon on your printer model. Significantly though, we have had reports of profitable use, and stories of unsuccessful use. The memory controller has to support EDO if there is to be any chance of it working. With older printer fashions, that might be not the case. Mixing FPM and EDO is discouraged, because it is not stable at what was thought of high memory access speed in those days. However, since HP says "80ns or slower", we do not essentially see a problem in utilizing EDO, as long as it really works: Despite the fact that the constructed-in memory will probably be FPM, and thus you're mixing. ECC memory is error-correcting memory and will never work in a HP printer, though it'll physically match. Concerning pace: 70ns or sooner means you possibly can take a 60ns SIMM, encode it as 70ns, and it'll work.

Now we have successfully accomplished this. HP really quotes 80ns, or "80ns or slower", however we wish to be very conservative about this type of thing. SIMMs you buy these days will probably be 60ns, anyway. Right. Pads (or pins, for those who so will) 67 to 70 on a 72-pin SIMM encode the dimensions and speed of that SIMM. Every of them can both be open or related to GND (ground). Look at a SIMM you took out of your Pc. Likelihood is you will note traces running from pads 67 to 70 to empty points the place a solder blob or SMD resistor would fit. Pc clones, as a rule, do not use the Presence Detect pads on a SIMM. That is why the pads are (often) left unsoldered. Furthermore, there is no such thing as a customary for the encoding of those pads. IBM has their own way, as does HP, as does Dell, as do others.