Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!samsung!munnari.oz.au!brolga!bunyip.cc.uq.oz.au!marlin.jcu.edu.au!glmwc
From: glmwc@marlin.jcu.edu.au (Matt Crowd)
Newsgroups: comp.sys.amiga.tech
Subject: Re: CIA Timers and Interrupt priority problems
Message-ID: <1991Jan7.104513.9163@marlin.jcu.edu.au>
Date: 7 Jan 91 10:45:13 GMT
References: <650@faatcrl.UUCP> <1991Jan3.030604.21890@watdragon.waterloo.edu>
Organization: James Cook University of North Queensland
Lines: 22

In article <1991Jan3.030604.21890@watdragon.waterloo.edu> ccplumb@spurge.uwaterloo.ca (Colin Plumb) writes:
>In article <650@faatcrl.UUCP> jimb@faatcrl.UUCP (Jim Burwell) writes:
>>Hi...
>>
>>I'm writing a CLI based [Med|*tracker] module player.  The thing is pretty
>>much done, 'cept for one problem.  The music player routine uses Interrupts
>>from a CIA timer for its timing.  This is better than using vblank since
>>you don't have to worry about NTSC/PAL timing differences.  But now that CBM 
>>has stolen both CIA A timers for 2.0, I must use one of the CIA B timers.  
>
>Both CIA A timers are in use in 1.x, it's just that it wasn't properly
>documented for a long time.  See Appendix F of the 1.3 Hardware manual, or
>other recent sources.
>

If they are in use in 1.3 why does MED work in 1.3 but not in 2.0.  It
comes up with an alert in 2.0  "CIA timer A in use".  The code
for the player seems well written.

>	-Colin

Colin (different one!)