Flashing on Mac OS X (using an AGP tower Mac and you have Mac PCI video card):
1. Go to the page of ATIccelerator I and download the latest version.
2. Find a a reduced ROM file for your card that has been enlarged to 128K.
3. Mount the ATIccelerator disk image, hold down the Option key and drag the "Flasher & dumper" folder out to the desktop to make a copy of it there.
4. Run ATIccelerator I, go to the Misc menu and choose to put a Mac ROM into the flasher. Select the full Mac Radeon ROM file and put it in the ATI Multi Flasher (with confirmation) copied to the folder on the desktop. Shutdown the Mac.
5. Open up your Mac. Install the PC Radeon AGP video card into the Mac, along with a working Mac PCI video card. Attach the monitor to the Mac PCI video card and turn on the Mac and wait for OS X to finish loading. If the Mac doesn't boot at all (no chime), shut it down, go to step 6. If you heard the chime but no disk activity and the OS does not load, use the steps for the PC. If it is booting properly, go to step 7.
6. Take the Radeon AGP card out of the Mac, get some sticky tape, cut two small strips of sticky tape and tape connectors #3 and #11 (counting from the right on the BACK of the card with the AGP connectors pointing downward). Install the card in the Mac, turn the Mac on.
7. After the OS X finished loading, run the "Run Me First" program copied from the ATIccelerator I package. This program will load the ATIUTEXT.kext file.
8. Run the ATI Multi Dumper and it should produce a PC ROM file and a text output file for the PC video card you are trying to flash. Keep the PC ROM file in a safe place.
9. Run ATI Multi Flasher (with confirmation), which you already put the reduced Mac Radeon ROM file, enlarged to 128K, in with ATIccelerator, read the dialog box to make sure you are flashing the right card. The flashing process should reach 100%. (If you use a reduced ROM file, not enlarged to 128K, and if the flashing process stops at something like 82%, DON'T RESTART OR SHUTDOWN THE COMPUTER, try to flash a full ROM file into the card immediately, which will stop at 50%. Find a reduced ROM file, enlarged to 128K, to flash the card). If you have the "ERROR Programming Devices" window popping up, this means that the Mac flasher does not support the ROM chip on your card - use a PC.
10. Shutdown the Mac. Take the Mac PCI video card out. Connect the monitor to the flashed Radeon AGP card, start up the Mac and you should see whether the card works. If it doesn't work with OS 9, it may work with OS X. It is safe to run the ATI October 2004 ROM update, which update the ROM to a newer (or full) version, if the ROM chip on your card is 128K, and update the ATI ROM Xtender to version 1.2. (Don't run the ATI Sept 2004 ROM update as it will try to flash a full Mac ROM file into the card even if the ROM chip on the card is 64K, and the flashing process will stops at 50%, and so you will have to flash it again).
Note: Unless you have enlarged a PC Radeon ROM file to 128K (by dumping it using a PC flasher or the Mac flasher, not by adding zeros by hand), don't ever try to flash a PC Radeon ROM file into a Radeon card on the Mac as it could result in a serious problem -- use a PC to do it. ATIccelerator I requires Java Runtime Environment 1.4. Java RE 1.4 is part of OS X 10.3. OS X 10.2.6 - 10.2.8 users need to install the Java 1.4.1 update.