Interesting. I've never heard of or seen an Apple II ignore the card and just go to Basic ] prompt but that's why your's does. The first 4 bytes are the card ID.
If the ID is not found, the computer keeps scanning slots, then exits to basic. A $20 in place of $00 means that bit 5 is always set. What are the next 4 bytes?
They should be A2 03 86 3C. If those have bit 5 set they will be A2 23 A6 3C. If so, try reseating the P5 and P6 proms on the card. For that matter, you could reseat them all.
I assume the card is fried but maybe not. It could also mean a prom is bad but in that case you will need another card anyway.
If the ID is not found, the computer keeps scanning slots, then exits to basic. A $20 in place of $00 means that bit 5 is always set. What are the next 4 bytes?
They should be A2 03 86 3C. If those have bit 5 set they will be A2 23 A6 3C. If so, try reseating the P5 and P6 proms on the card. For that matter, you could reseat them all.
I assume the card is fried but maybe not. It could also mean a prom is bad but in that case you will need another card anyway.