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spo600:6502_math_and_strings_lab [2024/09/24 15:15] – chrisspo600:6502_math_and_strings_lab [2024/09/24 15:30] (current) – chris
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-======  6502 Math and Strings Lab  ====== +#REDIRECT [[6502 Program Lab]]
- +
-In this lab, you will write code with arithmetic/math and strings in [[6502]] assembly language, including text output, graphical output, and keyboard input, in preparation for learning more complex x86_64 and AArch64 assembly language. +
- +
-=====  Resources  ===== +
-  *  [[6502]] +
-  *  [[6502 Emulator]] +
-  *  [[6502 Math]] +
-  *  [[6502 Jumps, Branches, and Procedures]] +
-  *  [[6502 Emulator Example Code]] - Specifically: +
-    *  [[6502_Emulator_Example_Code#Place_a_Graphic_on_the_Screen|Place a Graphic on the Screen]] - for an example of defining a graphic using DCB, and copying a graphic to the screen +
-    *  [[6502_Emulator_Example_Code#Etch-a-Sketchtm_Style_Drawing|Etch-a-Sketch Style Drawing]] - for an example of converting (ROW,COL) co-ordinates to a screen address, and reading the keyboard +
-  *  [[https://github.com/ctyler/6502js-code/|6502js-code]] repo on GitHub - Specifically: +
-    *  Wordle-like example (wordle-6502) +
-  *  Opcode/Instruction References +
-    *  [[http://www.6502.org/tutorials/6502opcodes.html|6502 Opcodes with Register Definitions]] at 6502.org +
-    *  [[https://www.masswerk.at/6502/6502_instruction_set.html|6502 Opcodes with Detailed Operation Information]] at Masswerk +
-    * [[https://www.pagetable.com/c64ref/6502/?tab=2|6502 Instructions]] organized differently on the Ultimate Commodore 64 Reference site +
-===== Tips and Techniques ===== +
- +
-  *  Keyboard +
-    *  Access the keyboard using the CHRIN [[6502_Emulator#ROM_Routines|ROM routine]]. +
- +
-  *  Random number generator +
-    *  A random byte is available at memory location $FE. +
- +
-  *  Drawing a Line +
-    *  To draw a line between two arbitrary points (X<sub>1</sub>,Y<sub>1</sub>)(X<sub>2</sub>,Y<sub>2</sub>) where X<sub>2</sub>-X<sub>1</sub> > Y<sub>2</sub>-Y<sub>1</sub> and all coordinates are positive, calculate the rise/run, then set Y=Y<sub>1</sub> and iterate for X=X<sub>1</sub>>X<sub>2</sub> incrementing Y by the rise/run each step. +
-    *  Do something similar with run/rise where X<sub>2</sub>-X<sub>1</sub> < Y<sub>2</sub>-Y<sub>1</sub> +
-    *  Suggestion: Use fixed-point math for the rise/run (aka deltaY) value. +
- +
-=====  Lab 3  ===== +
- +
-====  Decide What to Write  ==== +
- +
-For this lab, write a program that meets these criteria: +
-  -  Your program must work in the [[6502 Emulator]] +
-  -  You must output to the character screen as well as the graphics (bitmapped) screen. +
-  -  You must accept user input from the keyboard in some form. +
-  -  You must use some arithmetic/math instructions (to add, subtract, do bitwise operations, or rotate/shift) +
- +
-For example, you could write a simple game: +
-  *  [[https://en.wikipedia.org/wiki/Pong|Pong]] +
-  *  [[https://en.wikipedia.org/wiki/Breakout_(video_game)|Breakout]] +
-  *  [[https://en.wikipedia.org/wiki/Mastermind_(board_game)|Mastermind]] +
-  *  [[https://en.wikipedia.org/wiki/Hangman_(game)|Hangman]] +
-  *  A drawing program +
-  *  A maze +
-  *  A number guessing game (try to guess a random number in the shortest number of tries, getting feedback of "too high" or "too low" for each wrong guess) +
-  *  Or any other type of game... +
- +
-Or a calculator/converter: +
-  *  An adding or subtracting calculator +
-  *  A decimal-to-binary or hexidecimal-to-decimal converter +
-  *  A inches-and-feet to centimeter converter +
-  *  A [[https://en.wikipedia.org/wiki/Electronic_color_code|resistor colour band]] calculator +
-  *  A program to draw bar or line graphs based on user input +
-  *  Or any other type of calculator or converter... +
- +
-**Or anything else that meets the criteria above** +
- +
-You can interact with the user using either display. For example: +
-  *  The main interaction could be on the graphical display, and instructions could be printed on the text display (which keys to use to move, for example); or +
-  *  The main interaction could be on the text display, and an appropriate pattern could be shown on the bitmap display (for example, a version of Wordle could display the words on the text display and the scoring of the guesses on the graphical display), or a calculator could use the text display for input and show a binary representation or a colour code on the graphical display (such as green for positive numbers, yellow for negative numbers, red for bad input). +
- +
-**Tip:** Keep it really simple! Assembly language is hard. Start simple, you can always add features later. +
- +
-====  Write it!  ==== +
- +
-Write the code for your selected program in the [[6502 Emulator]]. +
- +
-It can be helpful and fun to write this code with one or two other people in a live session. Acknowledge each person's input, and add your own customizations or tweaks. +
- +
-**Remember to save your work periodically**, either by pasting the text into a file, or using the Save button. Tip: the Save/Load/Chose File buttons work really well with a directory that is managed by Git. +
- +
-** Acknowledge Other's Code ** - Feel free to incorporate other people's code into your program __with their permission__, but you **must** __acknowledge the source of any incorporated code__ (include a link to the source(s)), identify __how you attained permission__ to use the code (for example, if the code is distributed under an open source license, show which license applies) and __clearly identify which parts of the code you wrote__ (recommendation: colour-code your portion in the blog post). +
- +
-** You must write __at least 65% of the code__ in this lab. ** Don't take an existing program and just make minor changes to messages or colours. +
- +
-====  Blog it  ==== +
- +
-Write up your adventures in your blog. Remember to include the source code, some narrative about how it went, perhaps a screenshot of the program running, a reflection on the experience, and some ideas for further enhancement of the program. +
- +
-Ensure that your program works and is free from major bugs. Document any limitations or remaining minor bugs. +
- +
-Make sure that others (including your prof!) can run you code by pasting it into the [[6502 Emulator|emulator]] or loading it from a file (e.g., public git repository or downloadable file). +
- +
-Remember to follow the [[Blog Guidelines]] as you write. +
- +
-====  Examples  ==== +
- +
-For some examples of games and demos, see the [[#Resources]] section above, and also take a look at the http://txt3.de/ website - which uses an earlier version of the [[6502 Emulator|6502 emulator]] used in this course. The "Open Project" control on that page provides access to some interesting and inspiring code (check out "Skier", for example). You can copy-and-paste any of those examples into our SPO600 [[6502 Emulator]]. Be sure to check for permission (or licensing terms) before copying any code from that site (or any other source) and incorporating it into your code. +
spo600/6502_math_and_strings_lab.1727190907.txt.gz · Last modified: 2024/09/24 15:15 by chris
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