Re: A92: Keyboard Interrupt

To: assembly-92@lists.ticalc.org
Subject: Re: A92: Keyboard Interrupt
From: "Bryan Christopher Turner" <bcturner@eos.ncsu.edu>
Date: Thu, 12 Feb 1998 19:30:45 -0500
In-Reply-To: Edward Plese <eplese@lnd.com> "A92: Keyboard Interrupt" (Feb 11, 9:23pm)
References: <34E26B39.F5433246@lnd.com>
Reply-To: assembly-92@lists.ticalc.org


>
> In the 3d raycasting game I am working on, it runs at a decent frame
> rate normally, but as soon as I hold down one of the arrow keys or any
> key at all, the frame rate is at least cut in half!  I'm sure this is
> due to the keyboard interrupt service routines.  Is there any way to get
> rid of this slowdown?
>

   For games, I'd advise running without any interrupts.  You may read from the
keyboard I/O ports to get the data you need.  The keypress interrupt is AutoInt
2, so setting the interrupt mask to 2 will turn it off.  However, the key
reading interupt is Auto Int 1, so it will be turned off too.  Can't have it
both ways I guess.
   moveq #2,d0    ; Turn off keyboard interrupts, #7 to turn them all off
   trap #1


--Bryan
bcturner@eos.ncsu.edu

Follow-Ups:

A92: Trig Lib

From: Anton Ivanov <ivanova@ucs.orst.edu>

References:

A92: Keyboard Interrupt

From: Edward Plese <eplese@lnd.com>

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