Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ucbvax!COGSCI.BERKELEY.EDU!bryce
From: bryce@COGSCI.BERKELEY.EDU.UUCP
Newsgroups: comp.sys.cbm
Subject: Re: sync detect
Message-ID: <8706020928.AA18199@cogsci.berkeley.edu>
Date: Tue, 2-Jun-87 05:28:29 EDT
Article-I.D.: cogsci.8706020928.AA18199
Posted: Tue Jun  2 05:28:29 1987
Date-Received: Thu, 4-Jun-87 06:14:14 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Lines: 13


> The Commodore 1541 disk drive has a routine to search for a sync character on
> a formatted disk. This routine ($F556) reads bit 7 (sync detect line) of $1C00
> to detect the sync character.  My question is, where (and what) is the routine
> that updates the ram location $1C00? 

It's not a RAM location.  $1c00 is part of the input/ouput chip that controls
the disk.  For a good description of all this see "Inside Commodore DOS", by
Richard Immers.   The author apologizes that the book is more expensive to
photocopy than purchase -> you see, he never got paid for writing it.


: bryce@cogsci.berkeley.EDU -or- ucbvax!cogsci!bryce  flush flash!