More Disk ][ Troubles

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Last seen: 4 months 1 day ago
Joined: Jul 15 2014 - 10:52
More Disk ][ Troubles

Neither of my Disk ][ drives will read any disks. I've had this problem before; replacement of the 74LS125 on the analog card solved it then. I tried a similar thing today, but the problem persisted.

For what it's worth, I noticed that the impedances of Drive 2's head are higher than they should be according to Sams Computerfacts.

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Last seen: 4 weeks 16 hours ago
Joined: Feb 16 2018 - 06:30
Re: More Disk ][ Troubles

Impedance on one drive shouldn't affect the other. Have you got a scope?

I'd start by working through this and seeing if you're getting signals off the various test points:
http://apple2online.com/web_documents/apple_disk_ii_technical_procedures.pdf

d.

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