LZ: Help with an interrupt

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LZ: Help with an interrupt

The subject says it all.  I'd like some help with an interrupt for a 
program I am working on.


You see, I don't have a clue as to how to install and/or use an 
interrupt.  I know what they are and kinda how they work, and one 
will prove VERY helpful to what I am doing.


Here is what I need to do:
The data I'm sending through the link port needs to be sent at a 
fairly constant rate.  NOT at a certian speed (although FAST).  The 
output just needs to be reasonably constant.  YES, I know that the 
EXACT speed of the calc varies with the batteries, but that will NOT 
matter here.  I also know that an interrupt occurs at a fixed rate 
(50 times a sec?) on the 85.  This is why I want to use an interrupt. 
 I know that an interrupt jumps to a certian location in RAM (or ROM) 
when it occurs (this could be the graph mem at $8641) and that the 
index register (is that the right name?) has something to do with it.




Can anyone help me?


TIA,


____
~Keith
FFNP69C@PRODIGY.COM