Path: utzoo!attcan!uunet!iconsys!caeco!i-core!geo-works!bryan
From: bryan@geo-works.UUCP (Bryan Ford)
Newsgroups: comp.sys.amiga.tech
Subject: Questions on the floppy drive hardware
Message-ID: <2117.AA2117@geo-works>
Date: 12 Aug 89 11:23:30 GMT
Followup-To: comp.sys.amiga.tech
Lines: 32

I have a few questions on the floppy drive hardware.

First, does the WORDSYNC feature shift each bit into a compare register as
they come in, and compare it at each bit, or does it just grab a whole word
at a time and compare it at each word boundary?  I would think the former,
but the manual is a little vague on this, and I've learned not to assume
anything.  :-)

What affect do the PRECOMP0, PRECOMP1, and MFMPREC bits have on data input
and output?  I know that the hardware doesn't automatically do
precompensation.  Is this just a hook for a later hardware feature?  What
does the standard trackdisk.device use for these bits?

I know that if you use FAST mode (2 usec per bit), you can't have two 1's
right next to each other in the data stream.  Is this limitation imposed by
the actual disk drive hardware, or the hardware in the Amiga, or both?


Thank you for your help.

				Bryan

P.S.  CBM, if/when you make a new Hardware manual, please clarify some of
this stuff a little bit better, and mention somewhere the FAST limitation.

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