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Huh?
TOPIC
I just upgraded from Mac OS version 7.5.1 to 7.5.3 and now I am unable to use my 24AC Display Card. When I change resolutions or the bit depth (number of colors displayed), the screen is not legible. What could be happening?
DISCUSSION
The symptom you are describing is related to the ROM version of the Macintosh Display Card 24AC. Version 1.0 of the ROM is not compatible with System 7.5.3 or greater. When Apple shipped the Macintosh Display Card 24AC, it had ROM v1.1 installed. ROM version 1.1 is fully compatible with System 7.5.3 and greater.
The only way you would have ROM version 1.0 on your Macintosh Display Card 24AC would be if you had a DVT card (developer version) or the card was purchased from Radius.
Identifying ROM Versions
To identify what version of the ROM is installed on the Macintosh Display Card 24AC, look for a label on the solder side of the display card. The label has Mac Display Card 24AC printed on it. A Bar Code number is also printed on the card. If the Macintosh Display Card 24ACIf you have a DVT card, contact Apple Computer, or your local Service Provide to get a replacement card. If you have a Radius version of the display card, contact Radius for additional help and instructions.
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