Re: A86: Re: Simple Routine Help

Re: A86: Re: Simple Routine Help

• To: assembly-86@lists.ticalc.org
• Subject: Re: A86: Re: Simple Routine Help
• From: Aaron Curtis <acurti1@umbc.edu>
• Date: Wed, 02 Jun 1999 23:04:37 -0400
• Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
• Delivered-To: assembly-86@lists.ticalc.org
• References: <28e27a27.2486af40@aol.com> <00d801bead52$5b4ab9e0$5b52dfd1@david>
• Reply-To: assembly-86@lists.ticalc.org

Actually I have had the phantom keypress problem even when using the
regular im 1 handler, but either way it was only with _really_ dead
batteries...  The rom has 4 nop's between the in and the out, so if you
want to be really cautious do that.  I haven't seen any difference when
leaving them out though.

David Phillips wrote:
> 
> I haven't personally seen the difference, but Mardell or someone else said
> you need at least a couple of NOP's in between the in and out (can't have
> too much time, but at least a couple of cycles to give the hardware a chance
> to respond).  And besides what Jeremy said, if you are disabling interrupts
> or writing your own handler, you need to do a <ld a,$ff \ out (1),a> to
> reset the port in your main loop or int handler.  If you don't, the calc
> will give you phantom key presses (very strange).

• A86: Simple Routine Help
• From: Jkhum98@aol.com
• A86: Re: Simple Routine Help
• From: "David Phillips" <david@acz.org>

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