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From: hase@netmbx.UUCP (Hartmut Semken)
Newsgroups: comp.sys.atari.st
Subject: Re: 1.44mb drives
Message-ID: <2083@netmbx.UUCP>
Date: 13 Mar 91 12:30:29 GMT
References: <1991Feb28.085205.28239@phoenix.pub.uu.oz.au> <1991Mar06.123439.20676@actrix.gen.nz> <2886@krafla.rhi.hi.is>
Organization: netmbx, Berlin, West Germany
Lines: 37

adamd@rhi.hi.is (Adam David) writes:

>In <1991Mar06.123439.20676@actrix.gen.nz> Roger.Sheppard@bbs.actrix.gen.nz writes:
>It would be nice to change the step rate for the drives to suit the disk each
>time a disk is changed.

This cannot be done in a way, that will work on all versions of TOS,
cause the location of the drive parameter block in RAM varies with the
TOS version.
If You want to use documented system calls only, You ll have to change
the step rate once and for all.

>a) disk-in-drive
>b) density-sense
>c) .....anything else not on older DD drives?

depends on drive. There is no standard.
Teac FD235HF carry the "DD-disk-in-drive" (active low) on pin 2 if the
appropriate jumper on the drive is set.
You must also set the HD jumper for the drive to detect HD floppies and
reduce write current whe DD disks are inserted.

>oh, and while I'm at it: 

>Does anyone know whether the WD1772 can handle 1024-byte sectors?
>If so then it should be possible to format 1848k onto a HD disk.

This can be done in software. The WD1772 will read and write 256, 512
and 1024 byte sectors. TOS will only work with 512 byte sectors.

It is possible and pretty safe to format 10 sectors per track with DD
floppies, and so is 20 sectors per track with HD drives and media.

hase
-- 
Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP
Hi! (Zaphod Beeblebrox)