Experiencing to run System 7.5.1 and lower in SS

[sheepmyshaver123]

Well I was try to make SheepShaver can boot System 7.1.2-7.5.1 without changing model ID (I know it was hardcoded for PM 9500/9600, but where is the code to change the model id of SheepShaver in GitHub?). However when SheepShaver tries to run bootable System 7.1.2-7.5.1, it will not boot and showing "This startup disk will not work on this Macintosh model.". I will tried to replace the resources (info) (boot, gbly, gusd, gtbl, etc.) from the System 7.5.2 Update enabler file to the system file, but failed (it will show "Sorry, a system error occurred" without error code).

And the worst thing is, when I tried to edit vers ID = 1 from the System 7.5.2 Update enabler file and changing the version number to 7.5.1, 7.5, or 7.1.2, SheepShaver refuses to boot them (showing "This startup disk will not work on this Macintosh model."). This is not affected on the System file v7.5.5, when the version number is changed to 7.5 or 7.5.1 (7.1.2 does not work), it will boot but 7.5.5 resources is used, identified to be 7.5 or 7.5.1, strange. This also affects on the System file v7.5.2, when the version number changed to 7.5.1 or lower it will not boot.

So how to make the System 7.5.1 or 7.1.2 to get it boot in SheepShaver since it uses the hardcoded model ID?

[Cat_7]

Is there any powerpc code in the versions you try to boot? If not, model-id or not, you will not be able to boot these versions in SheepShaver.

Best,
Cat_7

[sheepmyshaver123]

Yes, they contain PowerPC codes, however it was designed for Power Macintosh before PCI (NuBus and LC PowerMacs).

[yksoft1]

Those Nubus Powermacs had different code in their ROM and their special OS would require those features to run, which are not in Sheepshaver's PCI Mac OS ROMs.

[sheepmyshaver123]

Well you might check the source code at GitHub and see where the ROM detections are coded. I think it will won't add it for NuBus & LC Power Macintosh.