128mb SIMMs are not compatible with the Phase 5 Blizzard 1260 unless
they are single sided. Double-sided 128mb SIMMs are just too fat for
both the 1260 and the SCSI-IV. This applies to desktop AND tower cases
since due to the SIMM socket (and a rogue capacitor on the DCE
SCSI-IV) the module cannot physically click into place.
Single sided 64mb SIMMs are rare let alone 128mb ones. Since a 128mb
SIMM must have at least 16x DRAM chips then a single sided would have
to have a 8x2 rectangular configuration.
I have a single-sided, 60ns, FPM 64mb SIMM... but the last 4mbytes
will crash the machine when utilised. Not sure if this is a
laser-printer module or whether it's an issue with a 3.0 ROM/SetMap.
Bare in mind also that you are best avoiding EDO and going for FPM
(Fast Page Mode) SIMMs and also nasty Compaq and Laser Printer memory.
Try also avoiding ECC/Parity SIMMs as they have non-useable extra
chips which take up space and may conflict with your system. EDO has
been known to conflict with Blizzard cards and the extra benefits
cannot be utilised on Amigas anyway.
Do a search and I'm sure you'll see a few more threads on the SIMM
issue. It's important to get the very hard-to-find ones and not the
mass-produced EDO stuff from '96 onwards.
