A Appendix A Apple II 及 6502 CPU 相關資源

github - Eiroca - Awesome List of Apple II resources
- Apple II emulator on MacOS
  - Open Emulator - Apple II BASIC on MacOS
    - 下載 OpenEmulator.app
    - 執行 OpenEmulator.app 後, 選擇 Apple II plus (或其它), 會顯示以下螢幕
    - 左上角有幾個選擇: Power Down, Sleep, Wake Up, Reset. 選擇 Reset 會進入 BASIC, 可以開始寫 BASIC 程式
    - 可以參考Apple BASIC 範例程式 - 包含簡單繪圖 : 這網頁最後還有幾個連結, 包含 The Applesoft Tutorial, Applesoft BASIC Programming Reference Manual.
      - 這個網站對於 Apple BASIC 提供很好的入門, 擔心他後續不維護這網頁, 就把這網頁存下來, 建立個 mirroring site
- Apple II emulator
- 如何在網頁上撰寫 Apple BASIC
  - 網頁模擬 Apple IIjs
- Applesoft BASIC in Javascript 也是不錯的入門網站, 也包含許多示範程式, 及 6502 assembly 網頁
AppleLogic.org
Apple Documents - Programming - BASIC : 不只是 BASIC, 裡面有完整的 Apple 相關資料, 包括 source code, 硬體線路圖, 各種 CPU 及各種語言如 PASCAL、FORTRAN 等, 可以說是 Apple 的藏寶圖
- Local mirroring - BASIC : 只有部分存檔
github - Apple II System Software Source Code

Apple II ROM listings
* Source code for Apple II series System Software and DOS
* github source code
* Jon Relay’s Apple II Info Archives - memory map

Apple II and II+ memory map

RAM - 48KB ($0000 - $BFFF)
$0000 - $00FF (0 - 255)       <1KB: Zero Page
$0100 - $01FF (256 - 511)     <1KB: 6502 Processor Stack
$0200 - $02FF (512 - 767)     <1KB: GETLN Line Input Buffer
$0300 - $03CF (768 - 975)     <1KB: Free Space for Machine Language, Shape Table, etc.
$03D0 - $03FF (976 - 1023)     1KB: DOS, ProDOS, and Interrupt Vectors
$0400 - $07FF (1024 - 2047)    1KB: Text Video Page and Peripheral Screenholes
$0800 - $0BFF (2048 - 3071)    2KB: Text Video Page 2 or Applesoft Program and Variables
$0C00 - $1FFF (3072 - 8191)    5KB: Free Space for Machine Language, Shapes, etc.
(might be overwritten if you use a lot of variables or BASIC program is long)
$2000 - $3FFF (8192 - 16383)   8KB: High Resolution Graphics Page 1
$4000 - $5FFF (16384 - 24575)  8KB: High Resolution Graphics Page 2
$6000 - $95FF (24576 - 38399) 14KB: Applesoft String Data
(may have a little space free)
(some BASIC programs move the variables all the way up to $4000 or even $6000)

IO - 4KB
$C000 - $CFFF                  4KB: Mainboard I/O and peripheral slot ROM

ROM - 12KB ($D000 - $FFFF)
$D000 - $F7FF (53248 - 63487)  10KB: Applesoft Interpreter
$F800 - $FFFF (63488 - 65535)   2KB: System Monitor