Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!apple!julius.cs.uiuc.edu!zaphod.mps.ohio-state.edu!van-bc!ubc-cs!sol.UVic.CA!marykuca
From: marykuca@sol.uvic.ca (Brent Marykuca)
Newsgroups: comp.sys.mac.programmer
Subject: Need help programming SCC
Message-ID: <1991Jan29.205455.26919@sol.UVic.CA>
Date: 29 Jan 91 20:54:55 GMT
Sender: marykuca@sol.UVic.CA (Brent Marykuca)
Organization: University of Victoria, Victoria B.C. CANADA
Lines: 27

Hello there,

We are trying to set up a fairly high-resolution timing device based
on the Time Manager's ability to run a task every millisecond.  Our
task simply increments a global counter and it seems to give reasonable
accuracy.  Our difficulty lies in trying to find an input device that
we can use which will give us nearly-immediate response.  We have tried
using the keyboard, but the ADB manager only seems to report keypresses
every 11ms or so, which is apparently not good enough.  Our plan now is
to wire up some sort of device to the serial port which will cause an
interrupt when one of two buttons is pressed, and then have our interrupt
handler read the clock for us.

So, what I'm looking for is somebody who has done some low-level serial
port interrupt handler stuff with the SCC, or any tips at all about how
to approach this project.  Can anybody help?

Cheers,

Brent Marykuca (marykuca@sol.uvic.ca)
Apple Research Partnership Program
University of Victoria, BC, Canada
-- 

Brent Marykuca (marykuca@sol.UVic.CA)
Apple Research Partnership Program
Computing User Services