Path: utzoo!mnetor!uunet!husc6!cmcl2!brl-adm!umd5!ames!pasteur!ucbvax!WPI.BITNET!MPENDER
From: MPENDER@WPI.BITNET
Newsgroups: comp.sys.apple
Subject: (none)
Message-ID: <8805052340.AA24724@wpi.local>
Date: 5 May 88 23:40:49 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 33

For the people who asked about interrupts on the laser 128:

The interrupt generator is activated by:
C0C7: 0
This turns on the vertical backdrop interrupts, mouse interrupts are
handled by the vectored routine at $3FE.
Invisible mouse interrupts are generated and passed through $C4BA.
These invisible interrupts are regular, at 60 Hz.
The invisible interrupts can be intercepted by using the loader.obj0
routine from a system master disk.  If you rename fpbasic integer basic
it will load true apple fpbasic into the language card
(ram bank switched into upper 16K of normal memory).
Then after reading c083 twice to prepare the language card to be written
to, a person can change the irq system vector at $FFFE.

I have a routine which does this and puts a clock on the screen under
DOS 3.3, it needs a fix or two, but I'll try to upload it to this
board before I leave on Saturday.

I need to add one routine to it so reset doesn't deactivate the clock,
(so shoot me, I have crude software.)

                                Mike.
_______________________________________________________________________________
Bitnet:   MPENDER@WPI.BITNET                      Michael Pender
Internet: MPENDER%WPI.bitnet@talcott.harvard.edu  Computer Science /
       or MPENDER%WPI.BITNET@cunyvm.cuny.edu      Electrical Engineering

Worcester Polytechnic Institute: 100 Institute Rd., Worcester Mass., 01609

The Laser 128:  99.99% compatible, now if I can only get them to make an
 upgrade kit (for the apples).
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