Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!ut-emx!ccwf.cc.utexas.edu!greg
From: greg@ccwf.cc.utexas.edu (Greg Harp)
Newsgroups: comp.sys.amiga.programmer
Subject: "Nicest" way to sample at a given speed?
Message-ID: <44510@ut-emx.uucp>
Date: 21 Feb 91 00:16:59 GMT
Sender: news@ut-emx.uucp
Reply-To: greg@ccwf.cc.utexas.edu (Greg Harp)
Organization: The University of Texas at Austin
Lines: 26
Originator: greg@sylvester.cc.utexas.edu

What is the OS-nicest way to sample a pin on the joystick port at a given 
speed (such as 10kHz)?  I need to record some binary data coming in and
the speed at which I do it must be constant and fast.  

One way I thought of doing it was to use Paula in non-DMA mode (where she
sends a level 4 interrupt for every word).  I would then have an interrupt
server set up at level 4 to sample the port and store the status of the 
input.

Am I completely off track here?  

Is it possible to use the CIA timers at this high of a speed?  I know 
switching between PAL and NTSC presents a timing problem here, but does the
same problem exist in Paula?

I've not done anything requiring such accurate timing at such a high speed
before on an Amiga, so any help would be appreciated.

Thanks!

Greg
-- 
       Greg Harp       |"How I wish, how I wish you were here.  We're just two
                       |lost souls swimming in a fishbowl, year after year,
greg@ccwf.cc.utexas.edu|running over the same ground.  What have we found?
  s609@cs.utexas.edu   |The same old fears.  Wish you were here." - Pink Floyd