Letter Users Guide © Copyright 1999: Emir Sakic
Letter Users Guide
Welcome to Letter Users Guide. This guide will help you to use Letter - a TI-83 ASM word processing program.

The keys used in the "Letter" - program.

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Using the "Letter"
Program: LETTER
Description: A TI-83 ASM word processing program
Code: ASM SQUISHED
Author: Emir Sakic
Date: 10.01.1999.

This is a TI-83 assembly program that allows you to write words and meanings on TI-83 LCD with all ASCII letters and special characters available on TI-83.
You may save your files and recall them anytime later. Even if the calculator was turned off.

prgmLETTER features:
-Capital and small letters
-Numbers
-All special chars available on Z80 like @ ( ) ; : , . ? ! and many more.
-Inverse mode
-Fast delete
-Saving and recalling files.
Write the most important stuff (formulas, tel. numbers, addresses, or anything else), save it and recall whenever you need it.
prgmLETTER uses TI-83:s home screen in format 16x8.

How to use:

  1. With SOS or AShell:
    Make sure that you have SOS or AShell loaded in your TI-83 and download LETTER.83p
    Start SOS or AShell and select LETTER
    Without SOS or AShell:
    Download LETTER.83g Start prgmLETTER
  2. You will see the Letter logo. Press ENTER
  3. You are coming at the home screen with a little prompt in the upper left corner.
    Now you can write letters, numbers, and other chars in normal or reverse mode, delete it, save and recall files.
    See Letter-keys table above for information about keys used in program.
    Press and hold left or right arrow for other chars. Then any key.
    Write in reverse video pressing the X-key. Restore on LINK
    Save your files pressing the Y= key.
    Open your files pressing the WINDOW key.
  4. Quit on QUIT. Then ENTER

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The Important Notes
Read this notes before using prgmLETTER.

This is what you should have in mind:

ASM program

The Letter is a TI-83 program written in assembly. There is always a risk executing an ASM code.
You should "Back Up" all your important data before you start an ASM program.
I am not responsible at any way if this this program causes your calculator to crash and lose memory. Anyway that has never happened to me and it shouldn't happen to you unless you brake the following:
Do not attempt to turn the calculator off while program is running! This could cause your calc to crash.
Quit the Letter before turning your calculator off.

Knowing bugs

The Letter uses a safe RAM location to save files.
This location begins at STATVARS+403 and is 128 bytes long. If you run program which uses this part of memory you will erase the file you have saved in Letter.
(for example if you play "Penguins")
You may change this if you refer to ASM code file letter.z80

Using of some programs before running the Letter can mess with contrast when you are in Letter. (T ex. "Pacman99")
It looks like the calc has suddenly turned off. (I don't really know why this happens. If anyone has a clue, please let me know)
Increase the contrast, quit the Letter, turn the calc off, and start the Letter again.

If you find any other bugs, have any ideas how to fix it, if you can optimize my code, have any suggestions, critics, ideas, questions or anything else: please mail me and let me know.

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About Letter
This program is programmed by Emir Sakic, it is Free Ware and may be copied freely.
Letter is programmed by Emir Sakic.
Any comments on the program, or users manual can be sent by e-mail to saka@hotmail.com.

Visit my home page at http://www.du.se/~e98esa

If you edit the program, please keep my copyright notice at the exit of the program, along with your own.

The Letter.zip consists of the following files:

Letter.83p The main program for SOS or AShell.
Letter.83g The program for using without Shell.
Letter.z80 The Source file.
Keys.inc The include file used in programing.
letter.txt The Text help file.
UserGuide.htm This file.
Pictures 4 pictures used in this file.

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