Re: A85: Usgard

To: assembly-85@lists.ticalc.org
Subject: Re: A85: Usgard
From: Miklos Bergou <jbergou@superlink.net>
Date: Tue, 24 Mar 1998 22:29:09 -0500
Delivered-To: assembly-85-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <ead2c636.3518675d@aol.com>
Reply-To: assembly-85@lists.ticalc.org


what & really does is that it tells Usgard to add the location of your
program to the number you wrote, in this case, 0.  so the number you were
actually loading into hl was probably somehting like $9999 or some other
location in the ram.  the reason the screen scrolled was because you told
it to start writing on something like row 200 when there are only 8 rows to
write in, so it scrolled about 190 rows.
-miklos

>I was writing some code when I noticed something strange (when I made an
>error):
>
>ld hl,&0000
>ld ($800C),hl
>ld hl,&TEXT
>call D_ZT_STR
>
>TEXT:
>.db "text",0
>
>When that was executed the screen scrolled up, and no text was displayed.
>Notice the ld hl,&0000 opposed to the proper ld hl,$0000. What is happening
>when this is executed?
>
>Try it out.
>
>-Mikel Blanchard
>TheLayer.home.ml.org

References:

A85: Usgard

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