A82: Display port question

A82: Display port question

• To: assembly-82 <assembly-82@lists.ticalc.org>
• Subject: A82: Display port question
• From: Doug Torrance <profzoom@earthling.net>
• Date: Mon, 24 Nov 1997 15:24:39 -0500
• Organization: Manticore Software
• Reply-To: assembly-82@lists.ticalc.org

Hello, I'm trying to figure out how to write directly to the display
port.  I'm having troubles, however.

ld a,$20
 call $7f3
 out ($10),a
 ld a,$80
 call $7f3
 out ($10),a
 ld a,$ff
 out ($11),a

I thought this code would draw a line on the screen, however it does
nothing.  If I take out the call $7f3's, it draws a line sometimes,  but
not everytime.  What am I doing wrong?

Thanks!

--
Doug Torrance
profzoom@earthling.net
http://profzoom.home.ml.org
(:  Have a happy day!  :)

• A82: Avalanche 1.0 for Ash 3.0 bug or secret
• From: Creasy <n3ynd@bellatlantic.net>
• Re: A82: Display port question
• From: Dines Christy Justesen <c958362@student.dtu.dk>

• Prev: Re: A82: Lites Out
• Next: A82: Avalanche 1.0 for Ash 3.0 bug or secret
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