Amiga programming examples
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alpine9000 abe4b9e850 updates for test 1 2 years ago
000.trackdisk Update README.md 3 years ago
001.simple_image A few incorrect dbra counters 2 years ago
002.sprite_display Removed conflicting ADF name 2 years ago
003.music A few incorrect dbra counters 2 years ago
004.copper_bars Update README.md 3 years ago
005.copper_vert Update README.md 3 years ago
006.simple_blit A few incorrect dbra counters 2 years ago
007.masked_blit A few incorrect dbra counters 2 years ago
008.shift_blit A few incorrect dbra counters 2 years ago
009.anim_blit Updates for removal of -phxass option 2 years ago
010.blit_speed Updates for removal of -phxass option 2 years ago
011.ehb_mode Updates for removal of -phxass option 2 years ago
012.ham_mode Updates for removal of -phxass option 2 years ago
013.dithered_ham Updates for removal of -phxass option 2 years ago
014.lace_mode Removed -phxass assembler argument 2 years ago
015.sliced_ham Disabled interlaced for space 2 years ago
016.copper_fun Updates for removal of -phxass option 2 years ago
017.dual_playfield Removed -phxass assembler argument 2 years ago
018.vert_scroll Removed -phxass assembler argument 2 years ago
019.hori_scroll Removed -phxass assembler argument 2 years ago
020.shrinkler Updates for removal of -phxass option 2 years ago
021.calling_c Updates for removal of -phxass option 2 years ago
022.photons_bootloader Updates for removal of -phxass option 2 years ago
023.slideshow Changes for fs-uae debugger symbols 2 years ago
024.simple_text Cleanup 2 years ago
025.scroll_text Merge branch 'master' of https://github.com/alpine9000/amiga_examples 2 years ago
026.tile_hscroll Update README.md 2 years ago
027.parallax added adf 2 years ago
028.bs updates for test 1 2 years ago
assets File used for resize test 2 years ago
doc Cleanup 2 years ago
examples Simple blit 3 years ago
include spiked playing samples 2 years ago
shared workbench launch option 2 years ago
tools Create install floppy 2 years ago
.gitignore render pathways until empty column 2 years ago
LICENSE updated license 2 years ago
Makefile updated tool tests 2 years ago
README.md Update README.md 2 years ago

README.md

(re)Learning how to program an Amiga after a 20 year break

introduction

This repo contains example programs I have written as I re-learn how to program an amiga. The programs are written in assembler and directly access the hardware. Most of the examples have been tested using FS-UAE and my Amiga 500. Some require 1mb of chip ram, most work fine with 512kb.

Don’t use this as an amiga programming guide. I don’t do things the “correct” way. There are heaps of great guides out there if you want to do things the right way. My a68k asm vocab starts out pretty small, and grows only very slowly, so again, this is not guide on the best way to do things.

documentation

Most of the sites I have used during the learning process:

examples

Each example tries to introduce only one new concept, often building on the previous examples.

See each example’s README.md for a limited description as well as a clickable link to run the example in your browser using my hacked version of Scripted Amiga Emulator

Most of the examples are only tested on a 512kb chip ram A500. Some examples have an option extended versoin that might require more chip ram, and in that case an A600 would be the best option.

cross development environment

These examples are developed on a mac using cahirwpz’s AmigaOS cross compiler for Linux / MacOSX / Windows.

https://github.com/cahirwpz/amigaos-cross-toolchain

The support tools I have developed have additional requirements which you may not have on your system.

For a dump of what I did to install them see installing the cross development environment

building

Build all examples by running make at the top level directory.

Individual examples can be built by entering the directory and running make:

# cd 001.simple_image
# make

this will create a bootable ADF image in the bin directory.

Load this file directly into your emulator of choice as DF0:, or even better, run it on the real hardware.

emulators

The following are the emulators I have used so far:

they each have strengths and weaknesses, so it’s worth giving them each a try.

tools

The following cross development tools have been developed to support the examples:

  • imagecon # create amiga compatible raw image data from true color images
  • resize # resize images ready for imagecon
  • croppa # crop images ready for imagecon
  • mapgen # generate amiga data from tiled maps
  • fade # generate data for fading between palettes
  • makeadf # make ADF disk image

external tools

The following cross development tools have been sourced from external authors:

  • shrinkler # compress for maximum compression, slow decompression
  • doynamite68k # compress for fast decompression

Each tool has a test to check if any changes you have made have broken basic functionality:

# cd tools/imagecon
# make test
______  ___   _____ _____ ___________
| ___ \/ _ \ /  ___/  ___|  ___|  _  \
| |_/ / /_\ \\ `--.\ `--.| |__ | | | |
|  __/|  _  | `--. \`--. \  __|| | | |
| |   | | | |/\__/ /\__/ / |___| |/ /
\_|   \_| |_/\____/\____/\____/|___/
#

or test all by running make test at the top level

license

Some of the code I have included in this repository is copyright by various authors and provided under various licenses. Copyright notices are preseved where possible.

Some of the tools use GPL licensed libraries which would mean they could only be distributed under the conditions of the respective version of the GPL.

All code without a copyright notice is licensed as per the terms in LICENSE.