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From: treesh@vangogh.helios.nd.edu
Newsgroups: comp.sys.cbm
Subject: Re: ML help!!!
Message-ID: <1990Dec3.183605.19548@news.nd.edu>
Date: 3 Dec 90 18:36:05 GMT
References: <1990Nov30.161424.2348@uoft02.utoledo.edu>
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Organization: University of Notre Dame,  Notre Dame
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What you need to do is use whats called an IRQ splice.  I dont know exactaly
how this is done on the C128, but I would guess its not that hard.  If its
anything like its done on the 64, you will need to make one small modification
to the end of your ML routine, insteat of having it RTS, you will have it
JMP to a locations somplace in the Kernal ROM.  You will then alter an
IRQ vector, so that it now points to your ML, and when your ML is done it
will jump to the place in ROM to where it normally would have gone if you
had not alterd the vector in the first place.

IRQ's are jumpped to 60 times a second on the 64, and are for all pracitcal
pourposes transparrent to BASIC.

ctfm