Re: Re: WTD: tandon 603s or 602s

From: André Fachat (
Date: 2006-07-04 09:19:54

Von: Spiro Trikaliotis <>
> Hello Ethan,
> of the ST251-1 HD) could be selected as DS0, DS1, DS2 and DS3. To me, it
> seems that there were two bits on the shugart bus for selecting the
> drive (00, 01, 10, 11). The PC seemed to only use 01 and 10 (this is

No. There are four select lines on the cable. In PC drives one of those
has been converted to the "MOTOR ON" equivalent for the second drive.
See the VC1581 schematics or my CSA-Shugart bus card.



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