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IBM Fixed Disk and Diskette Drive Adapter For 5170

offensive_Jerk

offensive_Jerk

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Joined
Jul 13, 2009
Messages
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Location
Wisconsin
I must have a bad fixed disk card in one of my ATs. It occasionally throws a 601 error on post. Also it always throws a “ disk unusable” Error when trying to format a diskette. Reading is also flakey. Not sure what the issue is.

I borrowed a card from my other system and it seemed to work normally.

I suppose I need a replacement card.
 
No, I should try that though.
I did replace the capacitors just because I had a different one that had a shorted capacitor. Didn't help.
 
You might check the power supply. I have seen an instance recently where it seemed noisy/weak power may have been responsible for intermittent floppy issues. Similarly, you might test the card in a minimal configuration or in another machine.
 
I had the similar issue. Abort, Ignore, Retry on disk A; hang on disk B. Two things may have been at play. The Terminating resistor chip which should have only been installed on Drive A and swapping molex connectors, which could have related to the power supply like SomeGuy mentioned or dirty terminals.
 
Cleaned the contacts, no luck. Invalid media or track 0 bad message on both a and b drives.
Swapped a different card in from a 5170 that just blew the psu and both drives formatted fine.
Strange...
 
Is that an MFM controller? If so I can dig through my small collection of the things and send you one or two that may or may not work for the cost of shipping if it helps.
 
I've got several 16-bit RLL floppy+HD controllers that are collecting dust here. Good (WD1006V-SR2) for their day, but hopelessly obsolete today. I drop you one for the cost of shipping.
 
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