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Re: GD5422 BIOS weirdness

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 …

Re: GD5422 BIOS weirdness

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 …

Re: GD5422 BIOS weirdness

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! 😁

Re: GD5422 BIOS weirdness

Yeah I wondered about that, but a bit outside my experience of hex editing!! I attach the executable that has the 1.41 BIOS in it. This runs great from DOS and all, but of course I figure better loaded from ROM, and if it's in the ROM it should work for any hard coded BIOS routine calls.

Re: GD5422 BIOS weirdness

Yay great success! It was exactly as you all theorised, ODD and EVEN lay on top of each other. I used the split command and then combined them back, wrote it to an EPROM and it worked first time. I've attached the new (1.30) BIOS that I made in case anyone stumbles across this thread in the future. …

Re: GD5422 BIOS weirdness

In which case for a purely hardware solution I could correct the bad address lines on the card, then allowing me to run the standard ROM? Some scalpel action and a couple of bodge wires... 🤔

Re: GD5422 BIOS weirdness

Thanks so much for your reply! Ah!! So perhaps this board was originally designed to have two EPROMS (odd and even) and later it was squished down to one? How would I go about formatting my BIN to comply with that standard?

GD5422 BIOS weirdness

Hi everyone! I'm having something of a problem I've never seen before and I wonder if it rings a bell to anyone? I have an old ISA card based on the Cirrus Logic CL-GD5422 chipset. Card is in good condition and works fine, but it has a home programmed EPROM on it with the original 1.00b BIOS that …

CA64-T Chip Trouble!

Hi! I'm currently working through a backlog of damaged / unknown / dumped older motherboards and I've came across one that I think might be worth some time to fix up. Only one small issue: it's missing some chips and I can't find a decent high res picture of the board anywhere to figure out which …

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