You could try Seagate at http://www.seagate.com:80/support/disc/st506.shtml

At 12:06 PM 4/28/98 +0200, Manuel Bouyer wrote:
>
>Hi,
>Does someone know if the ST506 specs are available on-line somewhere (I
doubt -
>altavista didn't find anything).
>
>If someone knows how it works - I suppose the alternate register status
>doesn't exist on ST506 drives/controller (it has the property
>to not ack the interrupt on IDE systems, where the status register does) ?
>
>--
>Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
>--
>
>


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