Creating new CP/M disks - Progress on IMSAI - test-drb@ccmp.vtda.org

12 Jan 2008

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Subject: Re: Creating new CP/M disks - Progress on IMSAI
   From: M H Stein <dm561 at torfree.net>
   Date: Sat, 12 Jan 2008 12:53:45 -0500
     To: "'cctech at classiccmp.org'" <cctech at classiccmp.org>

-----------Original Message:

Date: Sat, 12 Jan 2008 09:47:58 -0500
From: "Richard A. Cini" <rcini at optonline.net>
Subject: Re: Creating new CP/M disks - Progress on IMSAI

It must have been a fluke...I can't get the YE drive to operate reliably
either. The drive won't recal consistently. I might try lengthening the HL
time in software and then give it another shot. 
FYI if the drive is at track 79... you MUST issue recal twice as the 765
only issues 77 steps MAX to recal. So if you get a recal fail do it again
and see if it works the second time (I bet it will).

Also if the step rate is 3MS set the 765 for 4ms.  Some of the floppies
need a 6ms step rate and if stepped faster they will miss a step (or many).

There are three controls in the 765 HLT (wait for head load) for those 
drives that load heads and to let the carriage settle, step rate and 
head unload time (rarely important).  This is set with the Specify
command.

Allison

...
 I may have to have to stick with the Teac drive and
figure out a way to
control the heads by software.

----------Reply:

If you're talking about a YE Data YD-380 (no suffix; the -B and -C are
completely different drives), AFAIK it does not have the normal DC/RY
option. Instead, it has an RY jumper with no pins provided which, when
jumpered, puts out /READY on pin 4!

mike 