Re: A86: ldir & lddr scrolling

To: assembly-86@lists.ticalc.org
Subject: Re: A86: ldir & lddr scrolling
From: David Phillips <electrum@tfs.net>
Date: Wed, 19 Aug 1998 11:29:35 -0500
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <00b701bdcb8e$6b3d0e80$fa46dacd@computername>
Reply-To: assembly-86@lists.ticalc.org

Yes, it's the same as scrolling the entire screen.  Since the screen is 128
pixels wide, and each pixel takes up 1/8 of a byte (a bit), there are 16
bytes per row.  To scroll part of the screen, load BC with the number of
rows to scroll times 16:

ld bc,32 * 16		; to scroll half the screen

At 12:28 PM 8/19/98 -0400, you wrote:
>    Would it be possible to only LDIR and LDDR part of the  screen to make
>only that part of the screen go up and down? --------------
>Jbrett
>tbarwick@esn.net
>http://ww2.esn.net/~tbarwick
>     

--
David Phillips
mailto:electrum@tfs.net
ICQ: 13811951
AOL/AIM: Electrum32

References:

A86: ldir & lddr scrolling

From: "JBrett" <tbarwick@esn.net>

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