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From: adamd@rhi.hi.is (Adam David)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Problems/Questions about Chinon HD drives.
Message-ID: <2626@krafla.rhi.hi.is>
Date: 15 Jan 91 15:15:17 GMT
References: <2623@krafla.rhi.hi.is>
Organization: University of Iceland
Lines: 23

I've narrowed down the possible causes for the problems I encountered with
dual Chinon FX357 drives.

Basically:
1) it is not related to the power supply,
2) it is not caused by heat,
(only worsened by it, there are only two states: Drive A: functions correctly
or drive A: consistently reads the same garbage. I have not dared attempt to
write data to drive A: while the drive is malfunctioning),
3) the floppy controller is in good order,
4) it does not appear to be caused by Spectre GCR (though possibly accentuated),
5) I doubt if signal termination is a problem. The dual drive setup works 100%
if one or both of the drives are standard DD types. Therefore:
6) I strongly suspect that the problem is signal interference between the two
drives on one of the five pins that used to be earthed on the older types.
What do these signals do?

I can probably "fix" this by simply cutting a few wires in the cable, but I am
not happy with applying a blind fix. See my previous posting for why not.

Thanks for any help,
--
Adam David.  adamd@rhi.hi.is