There may be some light at the end of this tunnel yet! There may be a IIfx ROM SIMM incompatibility.
I played around with my IIci and the Turbo601 a little bit this evening. Like most IIcis, it's got a ROM SIMM socket, a soldered ROM, and a jumper to select which ROM to use. Here were some interesting results:
The lines with the footnotes on them tell the story. I'm trying to boot an SE/30 with a T601 in it, but the T601 won't boot even in a IIci with the ROM SIMMs I have available.
If anyone has a IIsi ROM SIMM, a T601, and a IIci, I'd be interested to see if the IIci can boot the T601 with the IIsi ROM SIMM and the jumper open.
If anyone knows what happened to Gamba's homemade ROM SIMM, or has duplicated the effort, I'd be interested in hearing from you, too.
I played around with my IIci and the Turbo601 a little bit this evening. Like most IIcis, it's got a ROM SIMM socket, a soldered ROM, and a jumper to select which ROM to use. Here were some interesting results:
Code:
ROM SIMM | Jumper | Cache | Chime | Boot | Notes
--------------------------------------------------------------
empty | closed | empty | Normal | stock configuration
empty | open | empty | No | No | No ROM in use
IIfx | closed | empty | Normal | soldered ROM
IIfx | open | empty | Normal | IIfx ROM [1]
SE/30 | closed | empty | Normal | soldered ROM
SE/30 | open | empty | Doom | No | SE/30 ROM too old
empty | closed | T601 | PPC | Boot | stock configuration
empty | open | T601 | PPC | Boot | [2]
IIfx | closed | T601 | PPC | Boot | soldered ROM
IIfx | open | T601 | PPC | Boot | IIfx ROM [3]
SE/30 | closed | T601 | PPC | Boot | soldered ROM
SE/30 | open | T601 | PPC | Boot | SE/30 ROM
--------------------------------------------------------------
[1] "IIfx ROM SIMM hack" in a IIci
[2] This indicates the onboard ROM is being used for something
[3] This config worked fine without the T601If anyone has a IIsi ROM SIMM, a T601, and a IIci, I'd be interested to see if the IIci can boot the T601 with the IIsi ROM SIMM and the jumper open.
If anyone knows what happened to Gamba's homemade ROM SIMM, or has duplicated the effort, I'd be interested in hearing from you, too.