Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!rex!ames!uhccux!munnari.oz.au!comp.vuw.ac.nz!actrix!Roger.Sheppard
From: Roger.Sheppard@bbs.actrix.gen.nz
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Problems/Questions about Chinon HD drives.
Message-ID: <1991Jan17.053516.1538@actrix.gen.nz>
Date: 17 Jan 91 05:35:16 GMT
References: <2623@krafla.rhi.hi.is>
Sender: Roger.Sheppard@actrix.gen.nz (Roger Sheppard)
Organization: Actrix Information Exchange, Wellington, New Zealand
Lines: 17
Comment-To: adamd@rhi.hi.is
Distribution:world

Atari uses the Write enable line for disk change, Some OEM drives do not
toggle this line when the disk is removed, this can be changed by
disabling the disk in switch, Note: Gemdos is polling the drive all the
time, some drive do not respond to this poll if there is no disk in, so
that the write enable line is not toggled, I have a NEC FD1037A and find
that they work ok. Note: it is posible to Run a HD drive with some mods,
one that is posible is to change the Clock to the WD1702 controler ic.
the Germans have done it this way, also change the controler for the 8"
type, this is the format used for HD disks, there is a kit for both
the other from the USA, but please use some short screen leads...to the
drives also the drive case could need a earth...
I do have a Chinon in my ST and it works ok. but did have the Disk
change problem, disabled the disk in switch...but that does cause a
small problem , the drives will run without a disk in them...
 
-- 
Roger W. Sheppard   85 Donovan Rd, Kapiti New Zealand...