Re: A92: Business as usual

Re: A92: Business as usual

• To: assembly-92@lists.ticalc.org
• Subject: Re: A92: Business as usual
• From: Niklas Brunlid <e96nbr@efd.lth.se>
• Date: Mon, 30 Mar 1998 12:28:35 +0200
• Delivered-To: assembly-92-outgoing@towerguard.unix.edu.sollentuna.se
• References: <351F6883.7340E91B@ucs.orst.edu>
• Reply-To: assembly-92@lists.ticalc.org

Anton Ivanov wrote:
> 
> Can someone give me practical hints on how to make an event happen
> periodically (ex: blinking cursor).
> 

Use an interrupt. There are texts on ticalc.org about this.

> And still no one has answered my question about the legal ways to access
> BSS vars.
> In particular, how can I make a0 point to the first byte of data_table
> if data_table is in the BSS section?

Variables are accessed as usual, with two differences:
 1) They are not guaranteed to hold the same values as when you last
quit the program, and they are not initialized in any way.
 2) They don't have a constant adress relative to the program, meaning
you can't use "lea xxx(pc),a0". Simply use "move.l #xxx,a0" instead.

• A92: Business as usual
• From: Anton Ivanov <ivanova@ucs.orst.edu>

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