ptmcd@dalcsug.UUCP (06/01/87)
I am posting this request for a friend who does not have access to usenet news.
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 $1C00? If anyone out there in netland has an
answer please send me mail that I can forward to my friend.
All help would would be greatly appreciated.
--
P. Trent MaCDougall @ Dalhousie University
Halifax, Nova Scotia
uucp: {seismo,utai,aucs,wathmat}!dalcs!dalcsug!ptmcdbryce@COGSCI.BERKELEY.EDU.UUCP (06/02/87)
> The Commodore 1541 disk drive has a routine to search for a sync character on > a formatted disk. This routine ($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!