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4.0 KiB
4.0 KiB
Memory map of the Apple II ROMs
http://www.easy68k.com/paulrsm/6502/MEMMAP.HTM
| + | $F800-$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. | ||
| + | $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. | ||
| + | $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. | ||
| + | $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. | ||
| $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. | ||
| $D800-DFFF | Empty ROM socket. There was at least one third party ROM add-on. | |
| $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. |
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
Differences found
The autostart ROM listing has $FFFE:FFFF pointing to IRQ ($FA40). The apple2+.rom file I have points to $FF59 (OLDRST).