Post #3744037
2026-07-11 17:39 UTC
@DosFox@tech.lgbt Hm, the only addresses that the MonsterMac ROM accesses which I cannot explain are 0xfa0000 and 0xfa00{89}{08}. These are read via moveml, which doesn't make sense for a 5380.
In a MacPlus, the 5380 is found at 0x580000 and in the Mac 512k SCSI extension at 0x500000. I can't find any address in this range in the ROM. Perhaps you had to upgrade to 128kB ROMs – but the addresses called by the MonsterMac ROMs only make sense with 64kB ROMs.
http://www.applefool.com/se30/sites/Mac%20GUI%20SCSI%20512K.html
https://github.com/SuperSVGA/MacSCSI
Replies (2)
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@me_@sueden.social 2026-07-11 17:43
@DosFox@tech.lgbt There's a possible hint in the BlueSCSI docs – "SCSI upgrade cards for the Macintosh 128K and 512K, like the Dove MacSnap or the Levco MonsterMac, use Macintosh Plus ROMs and will work with the appropriate Mac Plus .ini configuration file" https://bluescsi.com/docs/Compatibility
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@me_@sueden.social 2026-07-11 17:54
@DosFox@tech.lgbt I think the 0xfa0000 address range is where the additional two ROM sockets are mapped to, there's a check for the magic (0x55aa aa55) signature in the code.