JDW: Last night I tested the floppy drive with this configuration:
SE/30 (80MB RAM)
IIsi adaptor
Turbo040 (later ASIC version) (4.11 ROM IIRC but I can TattleTech it if needs be) (40MHz 68040 @ 48MHz overclock)
Asante MacCon si
IIfx ROM SIMM
7.5.5
External 1.44MB floppy (upgraded external 800k drive with auto-inject SuperDrive mechanism)
Same results as you: proper operation with 800k floppies, inability to read 1.44MB ones (shows 'disk is unreadable' dialog box and formatting fails almost immediately)
Having reproduced your results, I think the Turbo040 and the IIfx ROM SIMM are incompatible in the SE/30. The only better test would be a Turbo040 attached to the proper DayStar SE/30 adaptor, but I don't imagine that there'd be any difference, since they're the same circuit, differently shaped.
SE/30 (80MB RAM)
IIsi adaptor
Turbo040 (later ASIC version) (4.11 ROM IIRC but I can TattleTech it if needs be) (40MHz 68040 @ 48MHz overclock)
Asante MacCon si
IIfx ROM SIMM
7.5.5
External 1.44MB floppy (upgraded external 800k drive with auto-inject SuperDrive mechanism)
Same results as you: proper operation with 800k floppies, inability to read 1.44MB ones (shows 'disk is unreadable' dialog box and formatting fails almost immediately)
Having reproduced your results, I think the Turbo040 and the IIfx ROM SIMM are incompatible in the SE/30. The only better test would be a Turbo040 attached to the proper DayStar SE/30 adaptor, but I don't imagine that there'd be any difference, since they're the same circuit, differently shaped.