VOGONS


GD5422 BIOS weirdness

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Reply 21 of 32, by slartibardfast0

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ChrisXF wrote on 2022-01-13, 12:55:

Oh, I actually found 1.41 here: https://ardent-tool.com/video/1MB_Short_SVGA.html

I'll give that a go today! 😀

I too have been looking for the real bios version of 1.41 for an AST Bravo with built-in GD5422!

I tried to dump the in memory version of the TSR, thought seen as it starts with 0x55 0xAA it would work, but no luck.

time to acquire more AM27C010-200JC EPROM's for burning, cheers thanks!

Reply 22 of 32, by ChrisXF

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Well, I ran that BIOS through the even/odd splitter and burnt it to an EPROM for my card... Sadly, it did NOT work: 'Eeeek, NO VGA!!' post beeps galore.

We've already more than established that my card is weird though, so maybe you'll have much better luck? Fingers crossed here! 😁

Reply 23 of 32, by weedeewee

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Would you mind posting a photo of your card ?

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Reply 24 of 32, by ChrisXF

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Yes, I meant to do that earlier!

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Reply 25 of 32, by weedeewee

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You said you ran the bios through the odd/even splitter. I'm assuming you mean you merged the odd/even files into one file?

I wonder what settings get saved in the XL93CS46 1024bit eeprom. 🤔

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Reply 26 of 32, by ChrisXF

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Yes, that BIOS is in normal straightforward format - so I split it even and odd and copied it back /b even+odd, just as I've been doing so far with success. No dice on this BIOS for some reason though.

I've attached the file I built for reference, and the file it's originally built from.

I think that mini EPROM is for the VGA EDID or something similar. I could unsolder it and read it out if we're curious!?

Attachments

  • Filename
    BIOS1.41 - No Luck.zip
    File size
    40.9 KiB
    Downloads
    12 downloads
    File license
    Fair use/fair dealing exception

Reply 27 of 32, by weedeewee

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Looking at those files...

06h6915.bin is a normal bios you should write to an eeprom.

bios1.41.bin is fubar.

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Reply 28 of 32, by ChrisXF

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weedeewee wrote on 2022-01-13, 16:30:

Looking at those files...

06h6915.bin is a normal bios you should write to an eeprom.

bios1.41.bin is fubar.

Yeah.... You might want to read the whole thread from the start and you'll see why that is. Writing the first .bin to an EPROM will not work at all for this card. Might work great for other cards though!

Reply 29 of 32, by weedeewee

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ChrisXF wrote on 2022-01-13, 16:37:
weedeewee wrote on 2022-01-13, 16:30:

Looking at those files...

06h6915.bin is a normal bios you should write to an eeprom.

bios1.41.bin is fubar.

Yeah.... You might want to read the whole thread from the start and you'll see why that is. Writing the first .bin to an EPROM will not work at all for this card. Might work great for other cards though!

My bad. That's annoying.

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Reply 30 of 32, by weedeewee

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Are you using the same size (e)eproms ?

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Reply 31 of 32, by weedeewee

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erhm...

BTW... are bios images from mca cards compatible with ISA cards ?

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