Has a 128 Mb EDO module fried my PPC ???

[Tahoe]

Avoid HP9000 parts, that's a UNIX server with a completely different hardware design to a regular PC. Chances are those SIMM's use a very different voltage and maybe even pin orientation. I know upgrading memory on one os those machines cost us more then a complete new Proliant server!
I can confim the D4893A work fine in my 1230 (or better, in my SCSI option, the simm is too large for the Blizzard itself). The D4892A also work, but these are 32MB.

[Tahoe]

Doubt it, but it's not impossible. You would expect the SIMM to get too much volt and burn, but then the PPC should work normally. I have seen this often on PC mainboards, people fixing their DIMM's wrong way around. You get a burned DIMM (really burnt, tracks completely molten off) but the mainboard works fine afterwards. The SIMM itself does not give any voltage back to the slot. The only option could be that a input line is crossed with an output line on such a dimm, basically sending cards voltage back to the card in a place it shouldn't be.
Hope you get it fixed!