Re: A83: Program creation <--- For Ian Graf.

To: assembly-83@lists.ticalc.org
Subject: Re: A83: Program creation <--- For Ian Graf.
From: Ian Graf <ian_graf@geocities.com>
Date: Thu, 04 Jun 1998 22:25:31 -0700
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
References: <19980604220008.442BD3504A@towerguard.unix.edu.sollentuna.se>
Reply-To: assembly-83@lists.ticalc.org


1) ldir stands for

ld: load
i: increment
r: and repeat

what this does is copies the byte hl points to, to the byte de points
to, and decrements bc. then it increments both de and hl and repeats
this process untill bc=0 (remember at each pass it decrements bc)

so if you wanted to copy a pic you made with pic83 this is what you
would do:

     ld hl,pic          ; where to copy from- points to the pic data
     ld de,plotsscreen  ; where to copy to- points to the graph buffer
     ld bc,756          ; the number of bytes to copy-
                        ; 12 bytes per row x 64 rows = 756 bytes
     ldir               ; now copy, byte by byte


2) the "prgm" token (in hex) is 5F. in order to add it to your program
do this:

     .db $5F,"IAN"

that would be prgmIAN


3) the data for the program you wanted to make would be this

     .db tLbl,"1",tEnter
     .db tDisp,tString,"IAN MAKES GREAT PROGRAMS",tEnter
     .db tPause,tEnter
     .db tGoto,"1"

     ; :Lbl 1
     ; :Disp "IAN MAKES GREAT PROGRAMS
     ; :Pause
     ; :Goto 1

the only thing i had to change was the message. as you probaly noticed
they are all caps. in basic it is the biggest pain in the ass to use
lower case because they have to be 2 byte tokens, and there isn't
actually a character for every letter. to answer your question of how to
start a new line that is what "tEnter" does.


one thing to always remember is when you create the program, make sure
it is as long as the data you going to be copying to it. for example the
program in number 3 would be 34 bytes long.

References:

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