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Modify BIOS / Remove VGA BIOS - MS-6159

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First post, by matze79

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Hi,

I removed the VGA BIOS from my MS-6159 ROM, but it doesn’t launch the external VGA BIOS.
I soldered two BIOS chips piggy-back and made them selectable so I can experiment with the BIOS.

cbrom bios.bin /vga release — this removed the VGA BIOS.

However, my Matrox card never initializes unless I add the Matrox VGA BIOS directly to the main BIOS ROM.
What do I need to modify in order to get my BIOS to launch the ROM on the PCI card?

Thanks,
Matthias

Reply 1 of 3, by matze79

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The attachment vgapatch.jpg is no longer available

i got some progress, i know get a picture with a PCI Video Card.
But i need to fix the Checksum now.

One step closer

Reply 2 of 3, by Roman555

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matze79 wrote on 2026-05-30, 18:19:

But i need to fix the Checksum now.

Modbin fixes the System BIOS (first #0 module) checksum - change for example bios message and save to a new BIOS file.
CBROM fixes the whole Award ROM checksum - make some manipulation with a module (add/release) to force re-calculate.

Anyway, BIOS launches PCI OpROM only if a PCI device with corresponding VEN-DEV signature is connected to PCI bus.

MS-6159 has onboard AGP VGA. So you have to setup PCI videocard priority in BIOS settings first.

[ MS6168/PII-350/YMF754/98SE ]
[ 775i65G/E5500/9800Pro/Vortex2/ME ]

Reply 3 of 3, by NeoG_

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Why the need for BIOS modifications? The "Init Display First" set to PCI slot doesn't work?

98/DOS Rig: BabyAT AladdinV, K6-2+/550, V3 2000, 128MB PC100, 20GB HDD, 128GB SD2IDE, SB Live!, SB16-SCSI, PicoGUS, WP32 McCake, iNFRA CD, ZIP100
XP Rig: Lian Li PC-10 ATX, Gigabyte X38-DQ6, Core2Duo E6850, ATi HD5870, 2GB DDR2, 2TB HDD, X-Fi XtremeGamer

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