Path: utzoo!utdoe!generic!pnet91!cindy
From: cindy@pnet91.cts.com (Tom Peng)
Newsgroups: comp.sys.apple2
Subject: Interrupt
Message-ID: <283@generic.UUCP>
Date: 16 Dec 90 07:50:03 GMT
Sender: root@generic.UUCP
Organization: People-Net [pnet91], Etobicoke, ON
Lines: 28

Thanks for the various reply on the VBL interrupt on 8-bits Apple IIs.
However, I would like to know if there is any other interrupts that can be
used to create a background music player. Does clock cards generate an
interrupt that can be trapped so that periodically, the 6502 will jump to the
music player and click the speaker before passing control back to whatever it
was doing...

What I am saying is that, any ideas as to how I should approach to a
background music player program on an 8 bits Apple II? As most people agreed,
some sort of multitasking mechanism is required, but am I stuck with using the
VBL? Is VBL trappable on the II? Is so, how? Is there any 'better' interrupt
to use? 

Thanks in advance for all the replies. I am seriously devouted in getting
something like this completed.

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Tom Peng
University of Toronto Mechanical Engineering
Email: tomp@pro-micol.cts.com
       cindy@pnet91.cts.com

"Rewrite the Canadian constitution!!"

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