while navigating the web looking for a PC bios for my MAC rage 128 card i stumbled upon this thread
and i realized that i was not the only one trying to do this conversion
since you are struggling the same way i do, and some of you now are even convinced that it might not be possible to do it
well let me share my experience with you maybe someone might get some benefit out of it.
i have found an ATI rage 128 PCI (up until now i didn't know it was a mac version) in the scrap yard the card looked fine
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used it in my P4 machine (a corporate dull hp) the card showed no sign of life
so i inserted an AGP card and went to flash utility the card shows as a Rage128 adapter, good, tried to reflash the bios
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so as you see in the picture the flash utility couldn't do its task, not good
so suspecting a bad bios i desoldered and dumped it with Xgpro the flash eeprom reads fine, good
went to theretroweb and found couple of bioses, one of the was for MAC ! aha
i compared the one i dumped to the mac and it was the exact same thing, goood
so at that moment i realized that it was a MAC card from the beginning, i downloaded the two other bioses
one was 32KB the other is 64KB, flashed the 32KB version, soldered the rom chip, and went to HWINFO under windows
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the card shows fine as a rage128 32MB, Good
tried to post with the card, black screen nothing happens, Not Good
so i had to try the other bios 64kB, luckily this time i was able to flash it using the utility but from a Pentium 3 pc!
the flash utility was upset about my P4 maybe!!
flash went fine, tried to post with the card as primary adapter, and voila ! the card Posts 😁, Gooooooood
but when the post screen changes to MSDOS or windows loading screen, i get "Signal Error" on my LCD monitor, Not Goood
so back to the AGP as primary and into windows HWinfo, the card shows up as a rage128 All-in-Wonder 16MB !!! Aghhhhh damn
ironically the working bios was from an All-in-Wonder card that its just a 16MB
so asked chatgpt what can be the problem with my monitor signal error, it adviced me to use a CRT as LCD can be little picky
sure i did, got that CRT, and the card worked !!! goooood
but eventhough its working the vBios i have is just initializing half of the VRAM
so here i am looking for the right bios
who ever found it let me know please
End of story.