[comp.sys.mac.hardware] Wanted: Apple HD20 Diagnostic Info

deufel@kacie.enet.dec.com (My name is...) (01/05/91)

Hi World,

I have an Apple HD20 that is dead and I am trying to identify the problem.
(This is the original 20 Mbyte drive that plugged into the floppy port.)

If I run "HD 20 Test", the Apple supplied diagnostic, I get the following
report:

1/3 18:48 StartUp...
1/3 18:49 Unit did not pass selftest; Stat5: 00037DE0
1/3 18:49 Failed[7]  xfers = 0 soft = 0 hard = 0 comm = 0

Can anyone out there interperate the contents of Stat5: for me? Or, better yet,
can anyone out there tell me what registers are to be found in the HD20 and
what the various fields and bits they contain mean?

BTW: The unit fails with the above message with both of the HD20 controller
boards I have available to me. This would lead me to believe that the Rodime
552 is the problem.

Finally, I know that typing CMD-D to Apple's "HD 20 Test" gets me to the
comprehensive test screen, but how does one get to the comprehensive screens
in Apple's "Apple Hard Disk Test" Version 1.0? 

Inquiring minds want to know!!!

Thanks in advance...

			Cheers,
			-Abdul-


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|   Daniel Allen Deufel                         Digital Equipment Corporation  |
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