2600XT bios recovery

Discussion in 'Mac Pro' started by cornflakes1023, Feb 19, 2017.

  1. cornflakes1023, Feb 19, 2017
    Last edited: Feb 19, 2017

    cornflakes1023 macrumors newbie

    Oct 23, 2016

    I was trying to recover a 4870 that did not like the bios I created for it. I used the 2600XT from my 2008 Mac Pro as the primary card and the 4870 as the secondary card. I verified that the 4870 was device 1 using the command "atiflash -i". So I used the command "atiflash -p -fs -fp 1 4870.rom" to flash the 4870 back to it's original bios and that did work. However, the 2600XT will no longer display video. In a Windows system, it will boot all the way into Windows but the screen remains black.

    After much digging around I found an ancient Nvidia card to use as the primary card with the 2600XT as the secondary card.

    Using the command "atiflash -i" I get the following:

    adapter bn dn dID asic flash romsize test bios p/n
    ==== == == == ===== ===== ====== === =====
    0 04 00 9500 RV630/M76 R600 spi 10000 fail -

    With the command "atiflash -ai" I get:

    Adapter 0 (BN=04, DN=00, PCIID=95801002, SSID=95801002)
    Asic Family : RV630/M76
    Flash Type : R600 SPI (64kb)
    No VBIOS

    I downloaded what I believe to be the original 2600XT bios, one provided to another user by MacVidCards in another thread, it is 60k. However, when I try to flash that (or a few others) to the 2600XT using the same command "atiflash -p -fs -fp 0 2600XT.rom" it comes back with the error "failed to read rom"

    My question: Does anyone know how to get past the "failed to read rom" error? If I need to replace the bios chip, does anyone have a picture showing which of the many 8 legged chips is the bios chip?

    Any help would be appreciated. Thank you in advance.
  2. cornflakes1023 thread starter macrumors newbie

    Oct 23, 2016
    Update for anyone whom cares. I identified the bios chip, removed it. Programmed a fresh chip and soldered that on. I get the same as above. I also read the contents of the original chip and the bios appears intact.

    Anyone got any insight on this?
  3. 666sheep macrumors 68040


    Dec 7, 2009
    You already did much more than it's worth. Trash it.

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