First you need to check the ROM and make sure that it is:
a.) Actually an EEPROM that is flashable.
b.) Large enough to hold the Mac code. I believe it needs to be 64k for 
the Rage II/Pro cards, but its been a few years.

Generally speaking mac video cards tend to have larger firmware images 
than their exact x86 counterparts, requiring the mac versions to have 
larger flash chips. (and 200% markup for the extra 15 cents a card it 
would cost to put a larger chip on it)

Then you have to find out if the DOS based flasher will flash the Mac 
firmware to the card. I don't remember seeing a Mac flasher for the 
Rage II/Pro series cards for mac, not to suggest that one doesn't 
exist.

You can probably find an XClaim 3D/VR [128], Apple OEM Rage 128, or 
Rage Orion on Ebay for a few bucks, most of the time it is far less 
frustration.

On Apr 7, 2005, at 5:54 PM, Jeff Wyman wrote:

> I have an ATI Rage II card here. Would it be possible to flash it with 
> Mac
> firmware, or are there other differences on the card itself? XF86 
> detects
> it, but it doesn't show up in OBP, so I don't expect it to work as-is.
>
> If flashing it is possible, does anybody know of a firmware image for 
> Rage
> I/II cards? Can't find one anywhere.