Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!ucsd!ucbvax!CCC.NERSC.GOV!MORAGUES%CCV.MFENET
From: MORAGUES%CCV.MFENET@CCC.NERSC.GOV
Newsgroups: comp.sys.apple2
Subject: One Byte Memory Reads
Message-ID: <900808130731.2020095d@CCC.NERSC.GOV>
Date: 8 Aug 90 20:07:31 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 18

Hi everyone -
 
A while back I was trying to do some work with the 16-pin game port connector
on my //GS.  I was trying to use the four digital outputs.  To do this, 
memory locations must be referenced in order to toggle the states.  My problem
is that referencing one location usually created a 16-bit read that referenced
the following location which usually toggled the next signal.  This makes it
dificult to keep a steady state if the signals all are pulsating.  

I was wondering if there is a way to make the GS only do an 8-bit reference
while in native mode.  I would appreciate sample code in TML pascal if 
possible, ORCA Assembler or Pascal would also be appreciated.  I don't have
the exact memory locations with me now, but if you want them, I can post it.

Thanks in advance for your help

Bob Moragues
MORAGUES@CCC.NERSC.GOV