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From: toddpw@nntp-server.caltech.edu (Todd P. Whitesel)
Newsgroups: comp.sys.apple2
Subject: Re: High level language "fools" (was:Re: Stellar 7 re-release)
Message-ID: <1990Dec16.090131.1794@nntp-server.caltech.edu>
Date: 16 Dec 90 09:01:31 GMT
References: <14703@smoke.brl.mil>
Organization: California Institute of Technology, Pasadena
Lines: 23

unknown@ucscb.UCSC.EDU (The Unknown User) writes:

>	It's in 8088 on PCs... One thing I will say about the PCs was
>that doing interrupt stuff sure is damn easy! You just do a little BIOS
>call and change an address to your new routine... (I would HOPE it's
>that easy on the GS, but you have to go through the toolbox, don't you??
>Someone please inform me)..

Patching out the interrupt vectors is really easy. I've got an init that
patches out the AppleTalk IRQ handler to work with the ZipGS _without_ needing
the AppleTalk Delay option. You make tool calls to get and set the address; in
my case I save the old address because I want to be in-between the AppleTalk
IRQ code and the system.

Here at Caltech one of the recommended course sequences for EE's and CS people
is a pair of courses which cover 80188 programming and microcontrolled system
construction -- I still have mine. The 8 mhz 80188 wasn't fast enough to do
what I wanted to do via interrupts because the Segment registers take too long
to save and restore. A 65816 would have made the software for the project a
lot easier.

Todd Whitesel
toddpw @ tybalt.caltech.edu