Posted by Tom on February 26, 19103 at 23:10:24:
In Reply to: GRiD 1520 memory posted by Tom on February 26, 19103 at 22:28:18:
Hmm.
It seems they work in pairs, but oddly.
slot 1-5, 2-6, 3-7, and 4-8 should be the same,
but also 1-4,5-8 seems to be a pattern as well.
: Actually, it won't, now.
: The memory slots are really, really odd.
: I have:
: 8 original grid memory sipps (256k each ~ 120ns)
: 2 brands of 4 256k ~ 80ns sipps
: 4x1MB 80ns parity ( :( 2 are now broken after repated removal. )
: Now..
: going from bottom up (towards back)
: you have 8 slots.
: A) If the first four are used, the second four do not seem to matter, if the right combo of memory is used in the first. There must still be memory here, but the ordering does not matter. Mixing GRiD and non-grid memory causes read errors. Putting in the parity here causes it to see only 512k.)
: B) The parity cannot be in the first two slots. If 4 are used, they must be in every second slot. This brought me to 1480k.
: C) Putting GRID memory in with the parity causes the speaker to beep in a 1-3-3 pattern.
: D) Mixing GRID and non-parity works. It may cause read errors.
: E) I have had it read up to 4MB. However I do not know what combo I had to use, and I broke too many sipp's trying. At this point I'll have to settle with 384k. :(
: Actually, I'm going to try some more.
: If anyone has more info on just what's going on, post here, since I'm lost. I can't see a pattern with the memory, but I'm starting to figure things out.