Re: A89: how does one turn off the ti-89 in ASM with a key press?

Re: A89: how does one turn off the ti-89 in ASM with a key press?

• To: assembly-89@lists.ticalc.org
• Subject: Re: A89: how does one turn off the ti-89 in ASM with a key press?
• From: Olle Hedman <oh@hem.passagen.se>
• Date: Sun, 05 Mar 2000 12:22:02 +0100
• References: <20000305064920.15247.cpmta@c012.sfo.cp.net> <38C204F0.11D67ECE@geocities.com>
• Reply-To: assembly-89@lists.ticalc.org

Scott Dial wrote:
> the calc off. Btw, I was interested if anyone knew how to turn the LCD
> off without turning the whole calc off? The best I have accomplished is
> the random one line that you see just before the OS turns the calc off.

Have you tried to clear bit 1 in port $600015 ?
I havn't tried that myself, but according to my docs, it should work.

from 89hw.txt:
600015:0                turns on the ~740kHz oscillator used for the LCD and the
timers 
      :1                turns on data to the LCD, if 0, the LCD is all "white"
      :2                enables Autointerrupt 3, OSC/2^19 (1.4Hz)
      :3                enables incrementing of $600017 
      :5..4             frequency of increment of $600017:    

Oh. I just remembered. I _have_ tried it, and it do work :)

//Olle

• A89: how does one turn off the ti-89 in ASM with a key press?
• From: Caleb Austin <caaustinn@altavista.com>
• Re: A89: how does one turn off the ti-89 in ASM with a key press?
• From: Scott Dial <homosapian@geocities.com>

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