7800 GTX (512MB) - Mac PPC ROM

This is a modification of the ROM uploaded by pm7300 on the mac rumors forum. Timings have been modified to be compatible with a LeadTek, 7800 GTX 512MB card. For whatever reason, my card only reports 256MB of VRAM, but as I have found it very stable, I haven't attempted to rectify this.

I have uploaded an image on the Mac Rumors forums as a minor bit of proof and have included an image of the diff between pm7300's ROM and my own, it covers most of the differences but I encourage others to check for themselves.

For posterity, I had success flashing using NVFLASH 5.57 and FreeDOS. Use at your own risk, etc. I advise you backup your original ROM and shorten the ROM file name ready for DOS.

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VBIOS            = Original Leadtek PC VBIOS
PPC-7800GTX.ROM  = Modified Mac PPC ROM 
7800 GTX 512.ROM = Original Mac PPC ROM (Not included)

SHA2-256(VBIOS.ROM)          = 8c67825026e0cc23478b153859ae1467ef2ccccb9dcd59a3e45a9e3ef7db3255
SHA2-256(PPC-7800GTX.ROM)    = 8b5b3b7a38ce5fa7d2e812069d854cb5b1d35cfef6f8ea9f426ac3918f0b01b8
SHA2-256(7800  GTX  512.ROM) = 3608a1ee1ed80587d84c4df9924df2f1fca664db88550664cab9c4ee96272693

SHA1(VBIOS.ROM)          = 031ac5ebc7bb4b9f5aee75c63ddb8638f4b224e4
SHA1(PPC-7800GTX.ROM)    = f1966939859dd7789ceb940e6d911a45e644dcc7
SHA1(7800  GTX  512.ROM) = 7cc0ff39cbeba732aa8e27ed09d590e2139c491b

