Quote:
Originally Posted by JohnBHanson
You may need pullups on the SCSI lines to see it with your logic probe or at least something else on the SCSI bus.
Try measuring the voltage at pin11 and check it is within range (It should be a valid high level). If not pullups or suitable scsi device on the bus is required.
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I had been checking whilst single stepping under Gemdebug and could not see the -SEL signal, however, when the code is run at full speed I can see the -SEL activity. I can also see that with the disk connected the line is pulled up. After each -SEL I read the status and I always get FFh. I am wondering g if I have hit the issue you mentioned.
I noticed from the manual that the GM849A latches the -SEL, is that correct? I don't have a circuit diagram for that card.
I also noted that the SCSI2SD I am using has a Xebec Quirks mode, I will investigate what that offers also.