General Category > Lisa Troubleshooting and Repair
Lisa Sun Remarketing scsi card 92 error
sigma7:
--- Quote from: bmwcyclist on June 08, 2025, 06:53:22 pm ---Any sources to recommend?
--- End quote ---
Since you mentioned friends with EPROM programmers, I suggest you ask one of them to read the ROM from the SCSI card.
The first ten bytes should be 00 1B 00 00 00 00 00 00 00 00, to set the card ID to 1B, and the counter/pointers to 0. I think the rest can remain blank (FF's).
Depending on what they find, you could ask VintageMicros to resolve the problem, or just reprogram the part, or program a new one if your friend has some on hand - it is a 2716.
bmwcyclist:
--- Quote from: sigma7 on June 08, 2025, 07:27:58 pm ---
The first ten bytes should be 00 1B 00 00 00 00 00 00 00 00, to set the card ID to 1B, and the counter/pointers to 0. I think the rest can remain blank (FF's).
Depending on what they find, you could ask VintageMicros to resolve the problem, or just reprogram the part, or program a new one if your friend has some on hand - it is a 2716.
--- End quote ---
Do I understand correctly that the only data on the ROM is 00 1B 00 00 00 00 00 00 00 00 and the rest is blank??
Therefore, I don't need any special data to make a new ROM?
AlexTheCat123:
Yep, that's all you need. There's no actual code; the 1B is there to identify the card to MacWorks as a SCSI card, and MacWorks handles the rest. I've attached a file that you can burn straight into a 2732 if that makes things easier.
bmwcyclist:
--- Quote from: AlexTheCat123 on June 12, 2025, 09:26:11 am ---Yep, that's all you need. There's no actual code; the 1B is there to identify the card to MacWorks as a SCSI card, and MacWorks handles the rest. I've attached a file that you can burn straight into a 2732 if that makes things easier.
--- End quote ---
Thank You!
stepleton:
--- Quote from: AlexTheCat123 on June 12, 2025, 09:26:11 am ---Yep, that's all you need. There's no actual code; the 1B is there to identify the card to MacWorks as a SCSI card, and MacWorks handles the rest. I've attached a file that you can burn straight into a 2732 if that makes things easier.
--- End quote ---
Component golf challenge: you're MacGyver, the 2732 is missing, and you don't have an EPROM burner anyway. You need to reproduce the ROM with TTL ICs, discrete transistors, and/or passives --- or at least (it sounds like) you need something that returns 00 1B 00 00 00 00 00 00 00 00 for addresses 0..9. How do you do it? Note that use of a 74LS68[2/4/5/7/8] e.g. or similar is basically cheating :-) Highest marks for lowest BOM cost.
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