Re: A83: Exx and ex af,af'

To: Alan C Johnson <assembly-83@lists.ticalc.org>
Subject: Re: A83: Exx and ex af,af'
From: Linus Akesson <lairfight@softhome.net>
Date: Tue, 08 Sep 1998 19:41:49 +0100
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <19980907.195825.-248659.0.benjamin99@juno.com>
Reply-To: assembly-83@lists.ticalc.org

The alternate registers are used by the interrupt routines, so either disable
interrupts OR don't use the alternate registers. One idea would be not to have
anything valuable in the registers in your program at all at that point.
Misinterpreting a great word of wisdom:

"Memory is needed for all the operations of reason."
      --Blaise Pascal

Linus

On 07-Sep-98, Alan C Johnson wrote:

>If I needed to preserve al of my registers while I ran Joe's ZLIB sprite
>routines, would it be a bad idea to exx and ex af,af' to save space?  Or
>should I just stick with push/pop?
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References:

A83: Exx and ex af,af'

From: benjamin99@juno.com (Alan C Johnson)

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