Better news today! :approve:
One of our intrepid ROM Hackers PM'd me about the possibility of a jumper on the motherboard that might be necessary to reset to toggle MoBo ROM & SIMM ROM, so I checked it out and found one to try! I stuck a header pin jumper on it and it disabled the MoBo ROMs all right! [
] ]'>
Tried the modified IIfx ROM SIMM again on my lunch break, but no joy . . .
. . . tried the stock IIfx ROM SIMM and I got boot chimes! :
The Radius Color Pivot II PDS Card's Pre-boot splash screen followed up a four chime (?) memory error message, (?) which didn't really surprise me a bit.
Wolfed down some lunch and went back to work with GttMFH2E in hand and did a bit of copying and research. The error message probably results from the 1MB soldered to the IIsi MoBo as a funky Vampire Video RAM Buffer. It appears that the IIfx can't use SIMMs smaller than 1MB, so the IIsi's measly equivalent of four 256k SIMMs in Bank A made the IIfx ROM SIMM equipped IIsi barf!
Got home after work just now, pulled all the RAM out of Bank A of the IIfx and it booted up just fine! :approve:
Next step: desolder all the VCC connections to that measley 1MB of soldered DRAM on the IIsi's MoBo and see what transpires! }
One of our intrepid ROM Hackers PM'd me about the possibility of a jumper on the motherboard that might be necessary to reset to toggle MoBo ROM & SIMM ROM, so I checked it out and found one to try! I stuck a header pin jumper on it and it disabled the MoBo ROMs all right! [
] ]'>Tried the modified IIfx ROM SIMM again on my lunch break, but no joy . . .
. . . tried the stock IIfx ROM SIMM and I got boot chimes! :
The Radius Color Pivot II PDS Card's Pre-boot splash screen followed up a four chime (?) memory error message, (?) which didn't really surprise me a bit.
Wolfed down some lunch and went back to work with GttMFH2E in hand and did a bit of copying and research. The error message probably results from the 1MB soldered to the IIsi MoBo as a funky Vampire Video RAM Buffer. It appears that the IIfx can't use SIMMs smaller than 1MB, so the IIsi's measly equivalent of four 256k SIMMs in Bank A made the IIfx ROM SIMM equipped IIsi barf!
Got home after work just now, pulled all the RAM out of Bank A of the IIfx and it booted up just fine! :approve:
Next step: desolder all the VCC connections to that measley 1MB of soldered DRAM on the IIsi's MoBo and see what transpires! }