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 18/10/2020: added Beneath Apple DOS and Apple ProDOS 2020, AppleWin FT edition, Social category
Update 16/07/2020: added 6502/65C02 opcode matrix, added Video 7 US patent
Update 04/05/2020: added link to LeChat Mauve RGB cards

Social

Generic 6502 and 65C02 reference

Tools

Technical reference

Code repositories

Modern hardware upgrades for Apple II

  • VidHD – Call-A.P.P.L.E.’s incredible HDMI card 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+
  • a2heaven – Many upgrades, you can get the Mega audio soundcard there (emulates every audio soundcard available for the A2).
  • Apple2.net – 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 🙂
  • Open Source Scan Converter – Converts analog RGB to HDMI, it works very well with Le Chat Mauve RGB cards and adapters.

Apple IIgs