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Posted Sun Jan 27, 2019 10:53 PM
Posted Thu Jan 31, 2019 12:40 PM
To piggyback on this, I run into this same problem when I try to boot DOS from CP/M (Softcard //e) in DuoDisk Drive 2. "BOOT D2," or whatever the command is, would only boot from Drive 1.
Once in DOS, I'm golden--I can do anything I want with Drive 2. But CP/M is giving me static for some reason.
Posted Tue Feb 5, 2019 10:46 AM
Just a quick update: I tried copying a disk using both Copy II Plus and ADTPro. The issue persists. These programs say they are reading/writing Drive 2, but actually use Drive 1.
If anyone has any advice on next steps for troubleshooting, it will be appreciated. Thanks!
Posted Tue Feb 5, 2019 5:48 PM
Sounds like a device select line isn't pulling its weight. If its not throwing any other errors... I don't have any hard and fast idea where to start though, it'd have to originate on the controller and run all the way through to the interface inside the duo. Might require some schematic looking.
Posted Tue Feb 12, 2019 9:13 PM
Thanks for the info. I found the 590-0114 cable pinout online, and tested the voltages on the ENBL A and ENBL B lines (DB-25 pins 11 and 8, respectively). I assume ENBL A is Drive 1 and ENBL B is Drive 2. Anyway, I got very consistent results:
At Rest (baseline state):
ENBL A = 4.44 volts
ENBL B = 0.24 volts
Reading Drive 1:
ENBL A = 0.09 volts
ENBL B = 0.89 volts
Reading Drive 2:
ENBL A = 0.09 volts
ENBL B = 0.87 volts
I tried reading from each drive using both CATALOG and Copy II Plus. It seems that the voltage drops significantly on A and nudges upward on B in either case. There doesn't seem to be any dramatic difference calling one drive or the other. Is it possible the controller card is messed up? Or maybe the cable?
If anyone happens to know the expected results for those lines when reading from each drive, that would be very helpful.
Posted Tue Feb 12, 2019 9:37 PM
If the state of the two lines is the same reading either drive, that could be your smoking gun right there... I'm sorry I don't have the tech details to help a lot more. You could try checking the signal states on the card itself without the drive attached. It might help rule the card out. I'll see if I can find something more useful
Posted Wed Feb 13, 2019 12:12 PM
Posted Wed Feb 13, 2019 5:42 PM
It provides fixes for several problems but not this one. However, it refers to the Apple 5.25-Inch Disk Drive Diagnostic diskette, which I can't find much information about but seems like it might be handy. Does anyone happen to know if there's an image of this disk available for download?
Not off hand, that'd be another whole search I have a duodisk "guide" in the winds, I'm just awaiting access too, once I have it I'll post. Most of the documents I've seen thus far mostly refer just to the drive mechanisms. Like the one you have there.
Posted Fri Feb 15, 2019 11:17 AM
It turns out that one of my colleagues has an identical IIe with a DuoDisk, and both drives work fine. We're going to test the line voltages on that one, and then I'll have something to compare my results to. Hopefully this will at least narrow it down.
Things are looking less hopeless!
Edited by d_a_parker, Fri Feb 15, 2019 11:18 AM.
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