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From: blgardne@esunix.UUCP (Blaine Gardner)
Newsgroups: comp.sys.amiga
Subject: 80 track 5.25" drive help needed!
Message-ID: <383@esunix.UUCP>
Date: Sun, 28-Jun-87 17:55:12 EDT
Article-I.D.: esunix.383
Posted: Sun Jun 28 17:55:12 1987
Date-Received: Wed, 1-Jul-87 02:33:58 EDT
Organization: Evans & Sutherland Computer Corporation
Lines: 41
Keywords: df2: 80 track 5.25 SOS

I need help with getting a 5.25" drive to format to 80 tracks under
AmigaDOS.

I've successfully adapted a Teac FD-55-FV (DS-DD, 80 track) to my Amiga
using information previously posted here and elsewhere, But I still have
some problems.

1) I cannot format to 80 tracks. Using the mountlist entry suppled on
   the 1.2 workbench I have changed "df1:" to "df2:" and "unit 1" to
   "unit 2". This allows the drive to work as a 440K AmigaDOS drive.
   I expected that changing HighCyl from 39 to 79 would allow all 80 
   tracks to be used, but FORMAT dies on track 41.

2) The diskchange signal is not being read by the Amiga. I have CHNG*
   wired from pin 2 of the 34 pin drive connector to pin 11 of the 
   DB23. The Teac drive does generate a diskchange signal.

3) The head load solenoid on the Teac loads and unloads with every track
   change. It should load the head, format the disk, then unload the
   head. Instead it does the following: load head, format track 0,
   unload head; load head, format track 1, unload head, etc. As you can
   imagine, this makes for a lot of noise!

Can anyone shed some light on the problems mentioned above? The head
load is likely a hardware problem, but are the diskchange and 80 track
problems caused by hardware or AmigaDOS?

Can anyone give me some information on the various jumper settings on
the Teac FD-55-FV? I've got an older Teac manual, but it's no help on
this drive.

I was really hoping to be able to use the Teac as my SYS: drive,
combined with Facc I'd be able to clear a lot of stuff out of vd0: and
still have ramdisk speed. (Facc isn't much use on df0: since it's cache
is invalidated whenever I eject the Workbench disk.)

Any help would be greatly appreciated!
-- 
Blaine Gardner @ Evans & Sutherland
UUCP Address:   {ihnp4,decvax}!decwrl!esunix!blgardne
Alternate:      {ihnp4,seismo}!utah-cs!utah-gr!uplherc!esunix!blgardne