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From: ISEIC.EA@SIMTEL20.ARPA (Mark Rhyner)
Newsgroups: comp.sys.atari.st
Subject: Cartridge Port R/W
Message-ID: <12343746139.19.ISEIC.EA@SIMTEL20.ARPA>
Date: Mon, 19-Oct-87 11:42:41 EDT
Article-I.D.: SIMTEL20.12343746139.19.ISEIC.EA
Posted: Mon Oct 19 11:42:41 1987
Date-Received: Tue, 20-Oct-87 20:51:00 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 23

I am working on a school project (U of AZ, ECE Dept) which involves using the 
cartridge port to support a graphics card. I am using OSK as the operating 
system for this project.
 
I lost the article in which someone (Ashwin, Moshe, or Jawar?) stated how they 
implemented writing to the cartridge port. I would like to follow that 
implementation and support it as a "de facto" standard, i.e., clock to pin x, 
AS to pin y, etc.
 
I am making a modification to the implementation - I believe that he was 
writing to $3FFFFF. I am going to make the I/O port both read and write at 
$4FFFFF or above. I want to do this to avoid a potential conflict between the 
port and future memory expansion up to 4 megs. Any thoughts on this?
 
I would appreciate if the person in question could email the info contained in 
that article to:
                   iseic.ea@simtel20.arpa
 
I need the info as quickly as possible in order to complete this portion of 
the project this weekend (24-25 OCT) -- the end of the semester draws near!
 
I appreciate the help.         Mark Rhyner
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