Examples

Cross-platform examples

Hello world (C64/C16/PET/VIC-20/PET/Atari/Apple II/BBC Micro/ZX Spectrum/PC-88/Armstrad CPC/MSX) – simple text output
Fizzbuzz (C64/C16/PET/VIC-20/PET/Atari/Apple II/BBC Micro/ZX Spectrum/PC-88/Armstrad CPC/MSX) – everyone's favourite programming task
Text encodings (C64/ZX Spectrum) – examples of text encoding features
Echo (C64/C16/ZX Spectrum/PC-88/MSX)– simple text input and output
Calculator (C64/C16/ZX Spectrum/PC-88/MSX) – simple numeric input and output
Guessing game (C64/C16/ZX Spectrum/PC-88/MSX) – a guess-a-number game
Fire effect (C64/C16/ZX Spectrum) – a simple fire effect
Bell (Apple II/ZX Spectrum) – a program that goes *ding!*
Life (C64/C16/Atari/ZX Spectrum) – Conway's game of life

Rasterbar – simple rasterbar effect
Softscrolling – soft-scrolling a single line of text
Galencia starfield – a port of the starfield effect from the game Galencia
Space Poker [external link] – a game made for the 2018 Reset C64 Craptastic 4KB Game Competition

Multifile (source code, platform definition) – how to create a program made of multiple files loaded on demand
Panic – how panic works on C64, showing the address of where it happened

NES 101 tutorial example – a port of the tutorial example from the NES 101 tutorial by Michael Martin
MMC4 example – the same thing as above, but uses a MMC4 mapper just to test bankswitching

GB test example – a partial port of the NES example, with a rudimentary experimental text output implementation