Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!cbmvax!jesup
From: jesup@cbmvax.commodore.com (Randell Jesup)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Bug in Trackdisk.device?
Message-ID: <14462@cbmvax.commodore.com>
Date: 14 Sep 90 21:46:46 GMT
References: <6506@sugar.hackercorp.com> <20544.26e39e69@psuecl.bitnet>
Reply-To: jesup@cbmvax.commodore.com (Randell Jesup)
Organization: Commodore, West Chester, PA
Lines: 24

In article <20544.26e39e69@psuecl.bitnet> d6b@psuecl.bitnet writes:
>What you might be thinking of is the hardware sync feature. All versions
>of trackdisk up to and including 1.3 completely ignored it (hopefully
>someone at Commodore can explain why).

	Because it originally didn't have it (in pre-a1000 paulas).  Software
people asked for it, it got added, but the software never got revised to
make use of the feature until I rewrote parts of trackdisk for 2.0.

>One thing I don't like about the 2.0 trackdisk (and I don't know a lot
>about it, as I haven't yet disassembled it :-)) is that, although it
>does let you use the hw sync feature (via RawRead), it doesn't let
>you specify the sync word; it always places a $4489 in the register.
>Very annoying...

	If you need that level of control, use disk.resource GetUnit/GiveUnit
and program the hardware yourself.  $4489 is fine for most uses: both the
Amiga standard and the normal MFM disk controller (aka IBM/ST/etc) formats
use $4489.

-- 
Randell Jesup, Keeper of AmigaDos, Commodore Engineering.
{uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.cbm.commodore.com  BIX: rjesup  
Common phrase heard at Amiga Devcon '89: "It's in there!"