Apple II reference and code repositories

Here are some interesting resources if you want to code in assembler on Apple II.
This is absolutely not a complete list, your favorite search engine should give you a lot of results, but those are the websites that helped me the most.
Also, for generic 6502 algorithms, have a look at what the C64 scene can offer you!

Update 07/03/2023: added another 6502 opcodes sheet
Update 07/12/2022: added FT social accounts, more hardware mods
Update 14/11/2022: added Dithertron, HackzApple, Burtal Deluxe, AccurApple


Generic 6502 and 65C02 reference


Technical reference

Code repositories

Modern hardware upgrades for Apple II

  • Floppy Emu – BMOW’s floppy disk emulator for Apple II / Lisa / Mac. Can also act as a ProDOS hard drive if your Apple II has a smartport firmware.
  • ROM 4X and 5X – Enhanced ROMs for the Apple IIc and IIc+
  • RGB2HDMI – HDMI output for Apple II (example with PAL IIe)
  • Apple IIc to RGB – RGB output for Apple IIc
  • VidHD – Call-A.P.P.L.E.’s incredible HDMI card for Apple II
  • a2heaven – Many upgrades, you can get the Mega audio soundcard there (emulates every audio soundcard available for the A2).
  • – Ian Kim’s website, home to the Mockingboard 4c for Apple IIc. He sells it on eBay when a batch is available.
  • How to fix Apple Joystick’s buttons – Instead of buying another one 🙂
  • RetroTink 5X Pro – Best video converter available (but most expensive)
  • Open Source Scan Converter – Converts analog RGB to HDMI, it works very well with Le Chat Mauve RGB cards and adapters.

Apple IIgs