olePigeon
Well-known member
@joethezombie I've source NOS chips as well, but I didn't order them pending your SIMMs. Do you need more DRAM packages? I can forward you the link if you do.
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The memory chips are standard. The way they are wired to the SIMMs is proprietary, in the sense that only Apple ever did it that way. There's a thread where this is discussed at length. If you follow the linked threads upstream from Joethezombie to Doug's, to the link he provides on page one and two of his six page thread, you'll find that the link doesn't work. Sigh. I hope it comes back.Is Mac IIfx and LaserWriter RAM proprietary indeed? Not some sort of relatively uncommon but still standard RAM?
Does anybody have knowledge about this?
As mentioned in that thread that is currently missing, sigh, the SIMMs made with X4 chips work reliably four at a time, but not eight at a time. They'll also work in a 4 & 4 configuration with the "conventional" SIMMS, and actually, there's a config of 6 & 2 that works. I suspect too few chips is not sinking enough current in one of the address or control lines and causing ringing, but haven't experimented yet. It's on the list, right after that PEX ROM DIMM...@trag Those are interesting, it appears that the chips on the second are still available from one of my contacts in China, which is a big surprise. Not a big fan of their price but you only need 2...
@trag If you get the PEX ROM built, what do you think development wise can be done with such a ROM? Do you think it could be used in a 8600/9600?
By the way, number 1 will never happen... I've been trying for years.
What better way to spend one's time?Still trying to figure out where the last fifteen years went. Of course the eighteen-year-old might have something to do with it.
What do you have? I have a IIfx that is RAM-deficient.I don't really understand this thread but I have some spare IIfx SIMMS...
To bring this thread round full circle, if you need RAM for a IIfx, I have 4x 1MB sticks that you are welcome to. Say $10 for the 4?What do you have? I have a IIfx that is RAM-deficient.