Date   : Fri, 17 Jun 1983 07:05:00PM-EDT
From   : Edward Huang <RMS.G.EH%MIT-OZ@mit-mc>
Subject: Problem with Heath Z37 controller and Tandon TM-100-4 drives

Hello,
When running Heath/Zenith CP/M with the Z37-89 DD controller
and Tandon TM-100-4 drives, I often get BDOS SELECT errors.
Notice that this Tandon drive was brought from an outside
dealer NOT from Heath [Heath jacks up the price on outside
things they sell in their stores]. The drive is rated for 3ms
seek - those Bdos error SELECT happen during warm boot @ 6ms
When I increased the speed to 12 ms step, the errors went away
as well as all those soft errors I didnt know about. (see
SECERR counter in Heath BIOS listing - they give you # of
soft errors and retries)  Does any-one know what is wrong??
Is it because I used a non-Heath drive or what?
Thank you very much,
-Ed
RMS.G.EH@MIT-OZ via MIT-MC