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| A Bit Of A Rarity |
Posted by: blusnowkitty on 2020-06-03 06:24:00
As a side note, does anyone have a schematic of the ROM adapter? If the ROM gets released I might burn it to some real ROMs and throw it in my retail Mac 128 for a laugh 😀
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Posted by: Dog Cow on 2020-06-03 06:27:57
Good luck!
Any idea if those ROMs are on the Web somewhere? They've been on Mac GUI Vault for a few years:Â Twiggy Mac prototype ROM
I also did some write-ups back in 2014, investigating the file format and ROM:
Twiggy Mac ROM disassembly
Report on Twiggy Mac disks
As a side note, does anyone have a schematic of the ROM adapter? If the ROM gets released I might burn it to some real ROMs It isn't necessary to have the adapter. You can merge the contents into a Hi and Lo ROM as used on the production Macintosh board. Some people have already done it a few years ago with the newer Twiggy ROM version.
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Posted by: blusnowkitty on 2020-06-03 06:40:01
It isn't necessary to have the adapter. You can merge the contents into a Hi and Lo ROM as used on the production Macintosh board. Some people have already done it a few years ago with the newer Twiggy ROM version. Ah cool; soÂ
copy /b high1.bin + high2.bin combined_hi.bin
copy /b low1.bin + low2.bin combined_lo.bin
or for *nix
cat high1.bin high2.bin > combined_hi.bin
cat low1.bin low2.bin > combined_lo.bin
Burn to a pair of 27256 EPROMs and enjoy? Sounds easy enough.
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Posted by: jake18125 on 2023-01-25 15:30:07
I wonder if the PALs have the security fuses blown.
I'm guessing as it is a prototype and still very much a development system there is a minor chance that they would still be readable by a programmer.
If so, that's probably the only way to get at least some of the PAL equations for the macintosh! |
Posted by: Paralel on 2023-01-26 14:26:08
Now that this thread has been brought back to life, where did this all end up? Were the ROMs backed up? Was the disk recoverable? |
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