First post, by WJG6260
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Hello all,
Recently, I purchased this STB Powergraph C33. It's in fairly decent shape, and, after properly setting jumpers W1 and W2, the card worked a-okay in my 486. I tried to set it at 0WS, and it worked there too, but I set it back to factory while benchmarking.
After that, I was using the Philscomputerlab DOS benchmark pack and accidentally ran MTRRLBFE, and the card started to act quite strange. For example, DOS text would randomly get dim, then bright, then fade. I checked the connections, tried another VGA cable, and nothing worked. I even tried the card in another VLB board and came across the same issue.
Now, when I start a PC with it installed, I get a signal to my monitor, but no picture at all. After testing some more, I'm convinced there's something up with the VGA BIOS, but I'm not certain about that. The only reason I suspect as such was that the card was absolutely working prior to running MTRRLBFE, and--occasionally--text will show up on the screen.
I've tried everything--re-seating jumpers, re-seating the card, different VGA cables, a different monitor. Is there anything I'm missing? I dumped my BIOS, and noticed something odd. The BIOS on the VGAMUSEUM seems to be 64k, while mine is 32k. Can anyone confirm that 32k is proper?
Either way, I ordered some Winbond W27E257 EEPROMs, and I'm going to try to burn a new ROM, just to humor myself. On that note, to any of you who have one of these cards, would you mind sharing a copy of your BIOS?
Attached are a copy of my BIOS and the one from VGAMUSEUM. Mine is labeled STBPowerGraphC33 and the one from the site is WD90C33-ZZ.
I'd love to hear any thoughts that any of you may have, and any help would be vastly appreciated. When this card was working, it was quite fast--almost as fast as my ARK1000VL! It's a pretty weird card, that's for sure.