5.1 KiB
Memory map of the Apple II ROMs
http://www.easy68k.com/paulrsm/6502/MEMMAP.HTM
| $D000-D7FF | Programmer's Aid #1–missing from the original Apple II, this is a ROM | ||
| add-on Apple sold that contains Integer BASIC utilities such as | |||
| high-resolution graphics support, renumber, append, tape verify, | |||
| music, and a RAM test. Complete source code is in the manual. | |||
| $D800-DFFF | Empty ROM socket. There was at least one third party ROM add-on. | ||
| $E000-F424 | Integer BASIC by Woz (Steve Wozniak, creator of the Apple II). "That | ||
| intbasic.asm | BASIC, which we shipped with the first Apple II's, was never | ||
| assembled–ever. There was one handwritten copy, all handwritten, all | |||
| hand assembled." Woz, October 1984. | |||
| + | $F425-F4FB | Floating point routines. Woz's first plans for his 6502 BASIC included | |
| $F63D-F65D | floating point, but he abandoned them when he realized he could finish | ||
| fp.asm | faster by going integer only. He put these routines in the ROMs but | ||
| they are not called from anywhere. Complete source code is in the | |||
| manual. | |||
| + | $F500-F63C | Mini-assembler. This lets you type in assembly code, one line at a | |
| $F666-F668 | time, and it will assemble the proper bytes. No labels or equates are | ||
| miniasm.asm | supported–it is a MINI assembler. Complete source code is in the | ||
| manual. | |||
| + | $F689-F7FC | Sweet-16 interpreter. Sweet-16 code has been benchmarked to be about | |
| sweet16.asm | half the size of pure 6502 code but 5-8 times slower. The renumber | ||
| routine in the Programmer's Aid #1 is written in Sweet-16, where small | |||
| size was much more important than speed. Complete source code is in | |||
| the manual. | |||
| + | $F800-$FFFF | Monitor. Handles screen I/O and keyboard input. Also has a | |
| monitor.asm | disassembler, memory dump, memory move, memory compare, step and trace | ||
| functions, lo-res graphics routines, multiply and divide routines, and | |||
| more. This monitor has the cleanest code of all the Apple II | |||
| monitors. Every one after this had to patch the monitor to add | |||
| functions while still remaining (mostly) compatible. Complete source | |||
| code is in the manual. |
| E000-F424 | intbasic | |
| F425-F4FB | fp (1) | |
| F4FC-F4FF | 4 | ? - FF FF FF FF |
| F500-F63C | miniasm (1) | |
| F63D-F65D | fp (2) | |
| F65E-F665 | 8 | ? - FF FF FF FF FF FF FF FF |
| F666-F668 | miniasm (2) | |
| F669-F688 | 32 | ? - see below |
| F689-F7FC | sweet16 | |
| F7FD-F7FF | 3 | ? F6 FF FF |
| F800-FFFF | monitor |
F669-F688
F669- 84 58 STY $58 F66B- 86 57 STX $57 F66D- 85 56 STA $56 F66F- 08 PHP F670- 68 PLA F671- 85 59 STA $59 F673- BA TSX F674- E8 INX F675- E8 INX F676- BD 00 01 LDA $0100,X F679- 0A ASL F67A- 0A ASL F67B- 0A ASL F67C- 0A ASL F67D- 60 RTS F67E- A4 58 LDY $58 F680- A6 57 LDX $57 F682- A5 59 LDA $59 F684- 48 PHA F685- A5 56 LDA $56 F687- 28 PLP F688- 60 RTS
Misc
DOS listing info: http://www.digibarn.com/collections/business-docs/apple-II-DOS/index.html
Edasm docs ftp://ftp.apple.asimov.net/pub/apple_II/documentation/programming/6502assembly/Apple%206502%20Assembler-Editor.pdf
Apple II Original ROM Information http://www.downloads.reactivemicro.com/Public/Users/David_Craig/Apple2OriginalROMInfo.TXT
Complete sources: http://mosher.mine.nu/apple2/site/
Differences found
The autostart ROM listing has $FFFE:FFFF pointing to IRQ ($FA40). The apple2+.rom file I have points to $FF59 (OLDRST).