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Diffstat (limited to 'disasm/unalf14.notes.txt')
| -rw-r--r-- | disasm/unalf14.notes.txt | 248 |
1 files changed, 0 insertions, 248 deletions
diff --git a/disasm/unalf14.notes.txt b/disasm/unalf14.notes.txt deleted file mode 100644 index 92fd218..0000000 --- a/disasm/unalf14.notes.txt +++ /dev/null @@ -1,248 +0,0 @@ -uunalf was *not* written in C. no C compiler for the 6502 emits such -tight code, especially not the ones that were available in 1988. This -explains why it outperforms arc (which actually was in C) while having -a smaller executable size. - -unalf14.com is a standard Atari segmented executable. For disassembly -purposes, I converted it to a single chunk of raw object code: - -ataricom -n -m 1-2 unalf14.com unalf14.raw - -IOCB usage: - -#0 is E: as usual. -#1 is the input file(s). -#2 is K: (not sure if it's actually used). -#3 is the output file. - -When the program exits (print_msg_complete), it checks the byte at -$0700 (BOOTRG). If it's equal to $53 (ASCII S, for SpartaDOS), it -exits via an RTS. Otherwise it exits via JMP (DOSVEC), which reloads -the DOS menu on DOS 2 and compatibles. - -Bugs: - -ALF14.COM won't actually compress any files at all, when run from -the DOS on the disk image I keep finding in archives. The DOS is -"XDOS". Whatever I try to compress, I always end up with a 0-byte -output file. It works better in DOS 2.0S, but "*.TXT" doesn't catch -all the files it should, either. - -Trying to compress a file with the one-letter name D causes a an error -and the program exits. D:D works OK. - -Compressed files: ------------------------------------------------------------------------ -original data: -ff ff ff ff 00 ff ff ff ff 01 ff ff ff ff 02 -in binary: -00000000: 11111111 11111111 11111111 11111111 00000000 11111111 ...... -00000006: 11111111 11111111 11111111 00000001 11111111 11111111 ...... -0000000c: 11111111 11111111 00000010 - -compressed form: -10000000 00111111 11100000 01001111 11110000 00000100 00001101 11111110 00000001 10000011 00000000 10100000 00100000 - ------------------------------------------------------------------------ -orig in hex: - aa aa aa aa 00 aa aa aa aa 01 aa aa aa aa 02 - -orig in bin: - 0: 10101010 - 1: 10101010 - 2: 10101010 - 3: 10101010 - 4: 00000000 - 5: 10101010 - 6: 10101010 - 7: 10101010 - 8: 10101010 - 9: 00000001 -10: 10101010 -11: 10101010 -12: 10101010 -13: 10101010 -14: 00000010 - -compressed: - 10000000 00101010 10100000 01001010 10100000 00000100 00001101 01010100 00000001 10000011 00000000 10100000 00100000 -in groups of 9 bits: - 1 00000000 0 10101010 1 00000010 0 10101010 0 00000000 1 00000011 0 10101010 0 00000001 1 00000110 0 00000010 1 00000001 0 0000 - - 0: 1 00000000 ; 0 start - 1: 0 10101010 ; literal $aa - 2: 1 00000010 ; 2: $aa $aa - 3: 0 10101010 ; literal $aa - 4: 0 00000000 ; literal $00 - 5: 1 00000011 ; 3: $aa $aa $aa - 6: 0 10101010 ; literal $aa - 7: 0 00000001 ; literal $01 - 8: 1 00000110 ; 6: $aa $aa $aa $aa - 9: 0 00000010 ; literal $02 - 10: 1 00000001 ; 1 end - ------------------------------------------------------------------------ -orig (sam.txt): -00000000: 49 20 61 6d 20 53 61 6d 0a 0a 53 61 6d 20 49 20 I am Sam..Sam I -00000010: 61 6d 0a 0a 54 68 61 74 20 53 61 6d 2d 49 2d 61 am..That Sam-I-a -00000020: 6d 21 0a 54 68 61 74 20 53 61 6d 2d 49 2d 61 6d m!.That Sam-I-am -00000030: 21 0a 49 20 64 6f 20 6e 6f 74 20 6c 69 6b 65 0a !.I do not like. -00000040: 74 68 61 74 20 53 61 6d 2d 49 2d 61 6d 21 0a 0a that Sam-I-am!.. -00000050: 44 6f 20 79 6f 75 20 6c 69 6b 65 20 67 72 65 65 Do you like gree -00000060: 6e 20 65 67 67 73 20 61 6e 64 20 68 61 6d 3f 0a n eggs and ham?. -00000070: 0a 49 20 64 6f 20 6e 6f 74 20 6c 69 6b 65 20 74 .I do not like t -00000080: 68 65 6d 2c 20 53 61 6d 2d 49 2d 61 6d 2e 0a 49 hem, Sam-I-am..I -00000090: 20 64 6f 20 6e 6f 74 20 6c 69 6b 65 20 67 72 65 do not like gre -000000a0: 65 6e 20 65 67 67 73 20 61 6e 64 20 68 61 6d 2e en eggs and ham. -000000b0: 0a . - -Name Length Stowage SF Size now Date Time CRC -============ ======== ======== ==== ======== ========= ====== ==== -SAM.TXT 177 ALF 28% 128 8 Dec 82 12:24a 3690 - 0: 1 00000000 ; 0 start - 1: 0 01001001 ; literal $49 I - 2: 0 00100000 ; literal $20 - 3: 0 01100001 ; literal $61 a - 4: 0 01101101 ; literal $6d m - 5: 0 00100000 ; literal $20 - 6: 0 01010011 ; literal $53 S - 7: 1 00000100 ; 4 (?) - 8: 0 00001010 ; literal $0a - 9: 0 00001010 ; literal $0a - 10: 1 00000111 ; 7 (?) - 11: 1 00000101 ; 5 (?) - 12: 1 00000010 ; 2 (?) - 13: 1 00001000 ; 8 (?) - 14: 0 00001010 ; literal $0a - 15: 0 01010100 ; literal $54 T - 16: 0 01101000 ; literal $68 h - 17: 0 01100001 ; literal $61 a - 18: 0 01110100 ; literal $74 t - 19: 1 00000110 ; 6 (?) - 20: 1 00000100 ; 4 (?) - 21: 0 00101101 ; literal $2d - - 22: 0 01001001 ; literal $49 I - 23: 0 00101101 ; literal $2d - - 24: 1 00000100 ; 4 (?) - 25: 0 00100001 ; literal $21 ! - 26: 1 00001111 ; 15 (?) - 27: 1 00010001 ; 17 (?) - 28: 1 00010011 ; 19 (?) - 29: 1 00001011 ; 11 (?) - 30: 1 00010110 ; 22 (?) - 31: 1 00011000 ; 24 (?) - 32: 0 01101101 ; literal $6d m - 33: 1 00011010 ; 26 (?) - 34: 1 00000010 ; 2 (?) - 35: 0 01100100 ; literal $64 d - 36: 0 01101111 ; literal $6f o - 37: 0 00100000 ; literal $20 - 38: 0 01101110 ; literal $6e n - 39: 0 01101111 ; literal $6f o - 40: 1 00010011 ; 19 (?) - 41: 0 01101100 ; literal $6c l - 42: 0 01101001 ; literal $69 i - 43: 0 01101011 ; literal $6b k - 44: 0 01100101 ; literal $65 e - 45: 0 00001010 ; literal $0a - 46: 0 01110100 ; literal $74 t - 47: 1 00011100 ; 28 (?) - 48: 1 00010100 ; 20 (?) - 49: 0 01101101 ; literal $6d m - 50: 1 00011111 ; 31 (?) - 51: 1 00011001 ; 25 (?) - 52: 1 00001001 ; 9 (?) - 53: 0 01000100 ; literal $44 D - 54: 1 00100101 ; 37 (?) - 55: 0 01111001 ; literal $79 y - 56: 0 01101111 ; literal $6f o - 57: 0 01110101 ; literal $75 u - 58: 0 00100000 ; literal $20 - 59: 1 00101010 ; 42 (?) - 60: 1 00101100 ; 44 (?) - 61: 0 00100000 ; literal $20 - 62: 0 01100111 ; literal $67 g - 63: 0 01110010 ; literal $72 r - 64: 0 01100101 ; literal $65 e - 65: 0 01100101 ; literal $65 e - 66: 0 01101110 ; literal $6e n - 67: 0 00100000 ; literal $20 - 68: 0 01100101 ; literal $65 e - 69: 0 01100111 ; literal $67 g - 70: 0 01100111 ; literal $67 g - 71: 0 01110011 ; literal $73 s - 72: 1 00000011 ; 3 (?) - 73: 0 01101110 ; literal $6e n - 74: 0 01100100 ; literal $64 d - 75: 0 00100000 ; literal $20 - 76: 1 00010001 ; 17 (?) - 77: 0 01101101 ; literal $6d m - 78: 0 00111111 ; literal $3f ? - 79: 1 00001001 ; 9 (?) - 80: 1 00100011 ; 35 (?) - 81: 1 00100101 ; 37 (?) - 82: 1 00100111 ; 39 (?) - 83: 1 00101001 ; 41 (?) - 84: 1 00101011 ; 43 (?) - 85: 0 01100101 ; literal $65 e - 86: 0 00100000 ; literal $20 - 87: 1 00101111 ; 47 (?) - 88: 0 01100101 ; literal $65 e - 89: 0 01101101 ; literal $6d m - 90: 0 00101100 ; literal $2c , - 91: 1 00110001 ; 49 (?) - 92: 1 00110011 ; 51 (?) - 93: 0 01101101 ; literal $6d m - 94: 0 00101110 ; literal $2e . - 95: 0 00001010 ; literal $0a - 96: 1 01010001 ; 81 (?) - 97: 1 00100110 ; 38 (?) - 98: 1 00101000 ; 40 (?) - 99: 1 00111011 ; 59 (?) -100: 1 01010101 ; 85 (?) -101: 1 00111110 ; 62 (?) -102: 1 01000000 ; 64 (?) -103: 1 01000010 ; 66 (?) -104: 1 01000100 ; 68 (?) -105: 1 01000110 ; 70 (?) -106: 1 01001000 ; 72 (?) -107: 0 01100001 ; literal $61 a -108: 1 01001010 ; 74 (?) -109: 1 01001100 ; 76 (?) -110: 1 00000100 ; 4 (?) -111: 1 01011111 ; 95 (?) -112: 1 00000001 ; 1 end -junk: 0000000 - ==== ======== ==== ======== -Total 1 177 99% 128 - ------------------------------------------------------------------------ -orig: ABCDEFABBCCDDEEFABCABCDABCDEBCDBCDEBCDEF - - 0: 1 00000000 ; 0 start - 1: 0 01000001 ; literal $41 A - 2: 0 01000010 ; literal $42 B - 3: 0 01000011 ; literal $43 C - 4: 0 01000100 ; literal $44 D - 5: 0 01000101 ; literal $45 E - 6: 0 01000110 ; literal $46 F - 7: 1 00000010 ; 2 AB - 8: 1 00000011 ; 3 BC - 9: 1 00000100 ; 4 CD - 10: 1 00000101 ; 5 DE - 11: 1 00000110 ; 6 EF - 12: 1 00000010 ; 2 AB - 13: 0 01000011 ; literal $43 C - 14: 1 00001101 ; 13 ABC - 15: 0 01000100 ; literal $44 D - 16: 1 00001111 ; 15 ABCD - 17: 0 01000101 ; literal $45 E - 18: 1 00000011 ; 3 BC - 19: 0 01000100 ; literal $44 D - 20: 1 00010011 ; 19 BCD? - 21: 1 00010010 ; 18 EB? - 22: 1 00000100 ; 4 CD - 23: 1 00000110 ; 6 EF - 24: 1 00000001 ; 1 end -junk: 0000000 - |