Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!mucs!r2.cs.man.ac.uk
From: snowdond@r2.cs.man.ac.uk (D.N.Snowdon (MSc PJ))
Newsgroups: comp.sys.amiga.programmer
Subject: max rate of CIA interrupts?
Message-ID: <2160@m1.cs.man.ac.uk>
Date: 20 Feb 91 13:58:58 GMT
Sender: news@cs.man.ac.uk
Organization: Department of Computer Science, University of Manchester UK
Lines: 13


  Can anyone tell me what the maximum rate of interrupts
generated by the CIA timers is? I have a program that uses
a CIA interrupt to cause a soft int - the soft int does the
real processing as it can be quite lengthy. All my CIA int
code does is to check a flag indicating if the soft int is
still executing and if not it Cause's the soft int and exits.
  I can get up to about 544 interrupts/sec on a PAL A500
however this seems to be independant of the length of code
in the CIA int & whether I use a soft in or not. I seem to
remember someone saying he had acheived about 2000 CIA ints/sec
(albeit with sever CPU loading) but I don't know whether that
was using a 68000 or a faster processor.