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58 lines
2.9 KiB
Org Mode
58 lines
2.9 KiB
Org Mode
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** Program location
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Defaults to $801 for ROM-based Applesoft. Locations $67/$68 point to
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the start of the program, and the byte preceding it must be #0.
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Details:
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- http://www.atarimagazines.com/compute/issue11/36_1_THE_APPLE_GAZETTE_RESOLVING_APPLESOFT_AND_HIRES_GRAPHICS_MEMORY_CONFLICTS.php
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- http://retrocomputing.stackexchange.com/questions/1604
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** Format
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DOS stores an additional byte on the end, which should be ignored.
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** Parsing
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See PARSE.INPUT.LINE at
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http://www.txbobsc.com/scsc/scdocumentor/D52C.html
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"AT" is ambiguous: it could also be "ATN" or "A TO". Applesoft checks
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by seeing if the character directly after "AT" is "N" OR "O", and
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forcing a non-match with "AT" if so. Note that this doesn't skip
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blanks.
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Data statements and REM statements seem to leave characters completely
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intact (including storing the space, if any, after the "REM" or "DATA"
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keyword).
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** ProDOS and SOS File Types
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Beneath Apple ProDOS Table E.1
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| 00 | | both | Typeless file |
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| 01 | | both | Bad blocks file |
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| 02 | | SOS | PASCAL code file |
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| 03 | | SOS | PASCAL text file |
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| 04 | TXT | both | ASCII text fil |
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| 05 | | SOS | PASCAL text file |
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| 06 | BIN | both | Binary file |
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| 07 | | SOS | Font file |
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| 08 | | SOS | Graphics screen file |
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| 09 | | SOS | Business BASIC program file |
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| 0A | | SOS | Business BASIC data file |
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| 0B | | SOS | Word processor file |
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| 0C | | SOS | SOS system file |
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| 0D-0E | | SOS | SOS reserved for future use |
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| 0F | DIR | both | Directory file |
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| 10 | | SOS | RPS data file |
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| 11 | | SOS | RPS index file |
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| 12-18 | | SOS | SOS reserved for future use |
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| 19 | ADB | ProDOS | AppleWorks data base file |
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| 1A | AWP | ProDOS | AppleWorks word processing file |
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| 1B | ASP | ProDOS | AppleWorks spreadsheet file |
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| 1C-BF | | SOS | SOS reserved for future use |
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| C0-EE | | ProDOS | ProDOS reserved for future use |
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| EF | PAS | ProDOS | ProDOS PASCAL file |
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| F0 | CMD | ProDOS | Added command file |
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| F1-F8 | | ProDOS | ProDOS user defined file types |
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| FA | INT | ProDOS | Integer BASIC program file |
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| FB | IVR | ProDOS | Integer BASIC variables file |
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| FC | BAS | ProDOS | Applesoft BASIC program file |
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| FD | VAR | ProDOS | Applesoft BASIC variables file |
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| FE | REL | ProDOS | EDASM relocatable object module file |
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| FF | SYS | ProDOS | System file |
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