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From: donm@pnet07.cts.com (Don Maslin)
Newsgroups: comp.os.cpm
Subject: Re: uniform and 8 inch cpm formats on AT controllers
Message-ID: <1990Dec13.220504.25302@simasd.uucp>
Date: 13 Dec 90 22:05:04 GMT
Sender: pnet@simasd.uucp (People-NET)
Organization: People-Net [pnet07], San Diego, CA
Lines: 45

fzsitvay@techbook.com (Frank Zsitvay) writes:
>
>i had a file around here that showed how to wire a HD drive to an
>8 inch port, and imagine that i'll have to use the same cable
>for the 8 inch drive to 5.25 inch controller.  problem is, it's
>buried in a couple boxes of 8 inch cp/m disks and i don't relish
>the thought of spelunking into that box to find it.  besides, since
>there are probably other people on the net that want this information,
>could someone be so kind as to post that file for us??
>
>also, if anyone has any comments or suggestions concerning making a
>cable for this, feel free to add to the discussion.  i'm going to
>have to visit the library sometime later in the week and see what
>signals on the interface will have to go where, and work from that,
>but if someone knows it off of the top of their head, it would
>save me a trip into downtown portland, something i also do not
>relish.
>
The following table is extracted from the CompatiCard manual:
 
      Card            34              50      8 Inch Drive
Signal Name          Pin  Direction  Pin     Signal Name
========================================================================
Programmable          2       --->    2       Low Current
Index                 8       <---    20      Index
Drive Select 1/3      12      --->    28      Head Load
Motor Enable 1/3      16      --->    18      Drive Select 2
Step Direction        18      --->    34      Direction Select
Step Pulse            20      --->    36      Step
Write Data            22      --->    38      Write Data
Write Enable          24      --->    40      Write Gate
Track 0               26      <---    42      Track 0
Write Protect         28      <---    44      Write Protect
Read Data             30      <---    46      Read Data
Select Head 1         32      --->    14      Side Select
 
Connect odd number pins of 34 pin connector to odds of 50 pin connector
 
 
Hope this helps................................... - don


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