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MacBinary  |  1991-12-09  |  42.3 KB  |  [TEXT/EDIT]
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1% dexvert Text File (text/txt) fallback Supported
100% file MacBinary II, inited, Mon Dec 9 17:30:10 1991, modified Mon Dec 9 17:30:10 1991, creator Macintosh Edit, type ASCII, 42613 bytes "dissbits.asm" , at 0xa6f5 490 bytes resource default (weak)
99% file data default
74% TrID Macintosh plain text (MacBinary) default
25% TrID MacBinary 2 default (weak)
100% siegfried fmt/1762 MacBinary (II) default
100% lsar MacBinary default


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keyvalue
macFileType[TEXT]
macFileCreator[EDIT]


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|00004480| 20 20 20 20 20 6d 6f 76 | 65 2e 77 20 73 72 63 4f |     mov|e.w srcO|
|00004490| 75 72 73 2b 6f 4c 62 69 | 74 73 28 41 36 29 2c 44 |urs+oLbi|ts(A6),D|
|000044a0| 32 20 20 20 20 3b 20 6e | 6f 77 20 70 69 63 6b 20 |2    ; n|ow pick |
|000044b0| 75 70 20 73 6f 75 72 63 | 65 20 6c 65 66 74 20 6d |up sourc|e left m|
|000044c0| 61 72 67 69 6e 0d 20 20 | 20 20 20 20 20 20 65 78 |argin.  |      ex|
|000044d0| 74 2e 6c 20 44 32 09 09 | 20 20 20 20 20 20 20 20 |t.l D2..|        |
|000044e0| 3b 20 6d 61 6b 65 20 69 | 74 20 61 20 6c 6f 6e 67 |; make i|t a long|
|000044f0| 77 6f 72 64 0d 20 20 20 | 20 20 20 20 20 61 64 64 |word.   |     add|
|00004500| 2e 6c 20 44 32 2c 41 30 | 09 09 20 20 20 20 20 20 |.l D2,A0|..      |
|00004510| 20 20 3b 20 61 6e 64 20 | 6d 61 6b 65 20 41 30 20 |  ; and |make A0 |
|00004520| 75 73 65 66 75 6c 20 66 | 6f 72 20 6f 64 64 20 72 |useful f|or odd r|
|00004530| 6f 75 74 69 6e 65 20 62 | 65 6c 6f 77 0d 0d 20 20 |outine b|elow..  |
|00004540| 20 20 20 20 20 20 6d 6f | 76 65 2e 6c 20 64 73 74 |      mo|ve.l dst|
|00004550| 4f 75 72 73 2b 6f 42 61 | 73 65 28 41 36 29 2c 44 |Ours+oBa|se(A6),D|
|00004560| 32 20 20 20 20 20 3b 20 | 73 65 74 20 75 70 20 62 |2     ; |set up b|
|00004570| 61 73 65 20 70 6f 69 6e | 74 65 72 20 66 6f 72 20 |ase poin|ter for |
|00004580| 74 61 72 67 65 74 0d 20 | 20 20 20 20 20 20 20 6c |target. |       l|
|00004590| 73 6c 2e 6c 20 23 33 2c | 44 32 09 09 20 20 20 20 |sl.l #3,|D2..    |
|000045a0| 20 20 20 20 3b 20 61 67 | 61 69 6e 2c 20 62 69 74 |    ; ag|ain, bit|
|000045b0| 20 61 64 64 72 65 73 73 | 69 6e 67 20 77 6f 72 6b | address|ing work|
|000045c0| 73 20 6f 75 74 20 66 61 | 73 74 65 72 0d 20 20 20 |s out fa|ster.   |
|000045d0| 20 20 20 20 20 6d 6f 76 | 65 2e 6c 20 44 32 2c 41 |     mov|e.l D2,A|
|000045e0| 31 09 09 20 20 20 20 20 | 20 20 20 3b 20 73 74 75 |1..     |   ; stu|
|000045f0| 66 66 20 69 74 20 77 68 | 65 72 65 20 77 65 20 77 |ff it wh|ere we w|
|00004600| 61 6e 74 20 69 74 20 66 | 6f 72 20 74 68 65 20 6c |ant it f|or the l|
|00004610| 6f 6f 70 0d 20 20 20 20 | 20 20 20 20 6d 6f 76 65 |oop.    |    move|
|00004620| 2e 77 20 64 73 74 4f 75 | 72 73 2b 6f 4c 62 69 74 |.w dstOu|rs+oLbit|
|00004630| 73 28 41 36 29 2c 44 32 | 20 20 20 20 3b 20 6e 6f |s(A6),D2|    ; no|
|00004640| 77 20 70 69 63 6b 20 75 | 70 20 64 65 73 74 69 6e |w pick u|p destin|
|00004650| 61 74 69 6f 6e 20 6c 65 | 66 74 20 6d 61 72 67 69 |ation le|ft margi|
|00004660| 6e 0d 20 20 20 20 20 20 | 20 20 65 78 74 2e 6c 20 |n.      |  ext.l |
|00004670| 44 32 09 09 20 20 20 20 | 20 20 20 20 3b 20 6d 61 |D2..    |    ; ma|
|00004680| 6b 65 20 69 74 20 61 20 | 6c 6f 6e 67 77 6f 72 64 |ke it a |longword|
|00004690| 0d 20 20 20 20 20 20 20 | 20 61 64 64 2e 6c 20 44 |.       | add.l D|
|000046a0| 32 2c 41 31 09 09 20 20 | 20 20 20 20 20 20 3b 20 |2,A1..  |      ; |
|000046b0| 61 6e 64 20 6d 61 6b 65 | 20 41 31 20 75 73 65 66 |and make| A1 usef|
|000046c0| 75 6c 2c 20 74 6f 6f 0d | 0d 20 20 20 20 20 20 20 |ul, too.|.       |
|000046d0| 20 6d 6f 76 65 2e 77 20 | 73 72 63 4f 75 72 73 2b | move.w |srcOurs+|
|000046e0| 6f 43 6f 6c 73 28 41 36 | 29 2c 41 32 20 20 20 20 |oCols(A6|),A2    |
|000046f0| 20 3b 20 70 69 63 6b 20 | 75 70 20 74 68 65 20 6f | ; pick |up the o|
|00004700| 66 74 65 6e 2d 75 73 65 | 64 20 63 6f 75 6e 74 20 |ften-use|d count |
|00004710| 6f 66 20 63 6f 6c 75 6d | 6e 73 0d 20 20 20 20 20 |of colum|ns.     |
|00004720| 20 20 20 6d 6f 76 65 2e | 77 20 73 72 63 4f 75 72 |   move.|w srcOur|
|00004730| 73 2b 6f 52 6f 77 73 28 | 41 36 29 2c 44 32 20 20 |s+oRows(|A6),D2  |
|00004740| 20 20 20 3b 20 61 6e 64 | 20 6f 66 20 72 6f 77 73 |   ; and| of rows|
|00004750| 0d 20 20 20 20 20 20 20 | 20 61 64 64 2e 77 20 23 |.       | add.w #|
|00004760| 31 2c 44 32 09 09 20 20 | 20 20 20 20 20 20 3b 20 |1,D2..  |      ; |
|00004770| 6d 61 6b 65 20 72 6f 77 | 20 63 6f 75 6e 74 20 6f |make row| count o|
|00004780| 6e 65 2d 74 6f 6f 2d 68 | 69 67 68 20 66 6f 72 20 |ne-too-h|igh for |
|00004790| 63 6f 6d 70 61 72 65 73 | 0d 20 20 20 20 20 20 20 |compares|.       |
|000047a0| 20 65 78 74 2e 6c 20 44 | 32 09 09 20 20 20 20 20 | ext.l D|2..     |
|000047b0| 20 20 20 3b 20 61 6e 64 | 20 6d 61 6b 65 20 69 74 |   ; and| make it|
|000047c0| 20 61 20 6c 6f 6e 67 77 | 6f 72 64 0d 20 20 20 20 | a longw|ord.    |
|000047d0| 20 20 20 20 6c 73 6c 2e | 6c 20 44 31 2c 44 32 09 |    lsl.|l D1,D2.|
|000047e0| 09 20 20 20 20 20 20 20 | 20 3b 20 73 6c 69 64 65 |.       | ; slide|
|000047f0| 20 69 74 20 74 6f 20 6c | 69 6e 65 20 75 70 20 77 | it to l|ine up w|
|00004800| 2f 72 6f 77 73 20 70 61 | 72 74 20 6f 66 20 44 30 |/rows pa|rt of D0|
|00004810| 0d 20 20 20 20 20 20 20 | 20 6d 6f 76 65 2e 6c 20 |.       | move.l |
|00004820| 44 32 2c 41 34 09 09 20 | 20 20 20 20 20 20 20 3b |D2,A4.. |       ;|
|00004830| 20 61 6e 64 20 73 61 76 | 65 20 74 68 61 74 20 73 | and sav|e that s|
|00004840| 6f 6d 65 77 68 65 72 65 | 20 75 73 65 66 75 6c 0d |omewhere| useful.|
|00004850| 0d 20 20 20 20 20 20 20 | 20 6d 6f 76 65 2e 77 20 |.       | move.w |
|00004860| 44 31 2c 44 32 09 09 20 | 20 20 20 20 20 20 20 3b |D1,D2.. |       ;|
|00004870| 20 70 75 74 20 6c 6f 67 | 32 28 63 6f 6c 75 6d 6e | put log|2(column|
|00004880| 73 29 20 69 6e 20 61 20 | 73 61 66 65 20 70 6c 61 |s) in a |safe pla|
|00004890| 63 65 20 28 73 69 67 68 | 29 0d 0d 3b 0d 3b 20 74 |ce (sigh|)..;.; t|
|000048a0| 72 79 20 74 6f 20 72 65 | 64 75 63 65 20 74 68 65 |ry to re|duce the|
|000048b0| 20 61 6d 6f 75 6e 74 20 | 77 65 20 73 68 69 66 74 | amount |we shift|
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|000048d0| 69 6e 76 6f 6c 76 65 73 | 3a 0d 3b 20 20 20 20 68 |involves|:.;    h|
|000048e0| 61 6c 76 69 6e 67 20 74 | 68 65 20 73 74 72 69 64 |alving t|he strid|
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|00004920| 65 20 67 6f 0d 3b 20 20 | 20 20 6d 61 73 6b 69 6e |e go.;  |  maskin|
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|00004940| 73 20 6f 66 66 20 44 34 | 20 77 68 65 6e 20 77 65 |s off D4| when we|
|00004950| 20 65 78 74 72 61 63 74 | 20 74 68 65 20 72 6f 77 | extract| the row|
|00004960| 20 63 6f 75 6e 74 20 69 | 6e 20 74 68 65 20 6c 6f | count i|n the lo|
|00004970| 6f 70 0d 3b 0d 3b 20 61 | 6c 61 73 2c 20 77 65 20 |op.;.; a|las, we |
|00004980| 63 61 6e 27 74 20 61 6c | 77 61 79 73 20 73 68 69 |can't al|ways shi|
|00004990| 66 74 20 61 73 20 6c 69 | 74 74 6c 65 20 61 73 20 |ft as li|ttle as |
|000049a0| 77 65 20 77 61 6e 74 2e | 20 20 66 6f 72 20 69 6e |we want.|  for in|
|000049b0| 73 74 61 6e 63 65 2c 20 | 69 66 20 77 65 20 64 6f |stance, |if we do|
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|000049e0| 20 72 6f 77 20 63 6f 75 | 6e 74 20 77 69 6c 6c 20 | row cou|nt will |
|000049f0| 62 65 20 73 6f 20 68 69 | 67 68 20 61 73 20 74 6f |be so hi|gh as to|
|00004a00| 20 65 78 63 65 65 64 20 | 61 20 68 61 6c 66 77 6f | exceed |a halfwo|
|00004a10| 72 64 2c 0d 3b 20 61 6e | 64 20 74 68 65 20 64 72 |rd,.; an|d the dr|
|00004a20| 65 61 64 20 6d 75 6c 75 | 20 69 6e 73 74 72 75 63 |ead mulu| instruc|
|00004a30| 74 69 6f 6e 20 77 6f 6e | 27 74 20 77 6f 72 6b 20 |tion won|'t work |
|00004a40| 28 69 74 20 65 61 74 73 | 20 6f 6e 6c 79 20 77 6f |(it eats| only wo|
|00004a50| 72 64 20 6f 70 65 72 61 | 6e 64 73 29 2e 20 20 73 |rd opera|nds).  s|
|00004a60| 6f 2c 0d 3b 20 77 65 20 | 68 61 76 65 20 74 6f 20 |o,.; we |have to |
|00004a70| 68 61 76 65 20 61 6e 20 | 65 78 74 72 61 20 63 68 |have an |extra ch|
|00004a80| 65 63 6b 20 74 6f 20 74 | 61 6b 65 20 75 73 20 6f |eck to t|ake us o|
|00004a90| 75 74 20 6f 66 20 74 68 | 65 20 6c 6f 6f 70 20 65 |ut of th|e loop e|
|00004aa0| 61 72 6c 79 2e 0d 3b 0d | 0d 20 20 20 20 20 20 20 |arly..;.|.       |
|00004ab0| 20 6d 6f 76 65 2e 77 20 | 73 72 63 4f 75 72 73 2b | move.w |srcOurs+|
|00004ac0| 6f 53 74 72 69 64 65 28 | 41 36 29 2c 44 34 20 20 |oStride(|A6),D4  |
|00004ad0| 20 3b 20 70 69 63 6b 20 | 75 70 20 73 6f 75 72 63 | ; pick |up sourc|
|00004ae0| 65 20 73 74 72 69 64 65 | 0d 20 20 20 20 20 20 20 |e stride|.       |
|00004af0| 20 6d 6f 76 65 2e 77 20 | 64 73 74 4f 75 72 73 2b | move.w |dstOurs+|
|00004b00| 6f 53 74 72 69 64 65 28 | 41 36 29 2c 44 37 20 20 |oStride(|A6),D7  |
|00004b10| 20 3b 20 61 6e 64 20 74 | 61 72 67 65 74 20 73 74 | ; and t|arget st|
|00004b20| 72 69 64 65 0d 20 20 20 | 20 20 20 20 20 6d 6f 76 |ride.   |     mov|
|00004b30| 65 2e 77 20 73 72 63 4f | 75 72 73 2b 6f 52 6f 77 |e.w srcO|urs+oRow|
|00004b40| 73 28 41 36 29 2c 44 31 | 20 20 20 20 20 3b 20 70 |s(A6),D1|     ; p|
|00004b50| 69 63 6b 20 75 70 20 72 | 6f 77 20 63 6f 75 6e 74 |ick up r|ow count|
|00004b60| 20 66 6f 72 20 6b 6c 75 | 64 67 65 79 20 63 68 65 | for klu|dgey che|
|00004b70| 63 6b 0d 0d 20 20 20 20 | 20 20 20 20 74 73 74 2e |ck..    |    tst.|
|00004b80| 77 20 44 32 09 09 20 20 | 20 20 20 20 20 20 3b 20 |w D2..  |      ; |
|00004b90| 68 6f 77 27 73 20 74 68 | 65 20 62 69 74 63 6f 75 |how's th|e bitcou|
|00004ba0| 6e 74 3f 0d 20 20 20 20 | 20 20 20 20 62 65 71 2e |nt?.    |    beq.|
|00004bb0| 73 20 48 41 4c 46 44 4f | 4e 45 09 09 20 20 20 20 |s HALFDO|NE..    |
|00004bc0| 20 20 20 20 3b 20 73 6b | 69 70 20 6f 75 74 20 69 |    ; sk|ip out i|
|00004bd0| 66 20 61 6c 72 65 61 64 | 79 20 64 6f 77 6e 20 74 |f alread|y down t|
|00004be0| 6f 20 7a 65 72 6f 0d 0d | 48 41 4c 46 4c 4f 4f 50 |o zero..|HALFLOOP|
|00004bf0| 3a 0d 20 20 20 20 20 20 | 20 20 62 74 73 74 20 23 |:.      |  btst #|
|00004c00| 30 2c 44 34 09 09 20 20 | 20 20 20 20 20 20 3b 20 |0,D4..  |      ; |
|00004c10| 69 73 20 74 68 69 73 20 | 73 74 72 69 64 65 20 65 |is this |stride e|
|00004c20| 76 65 6e 3f 0d 20 20 20 | 20 20 20 20 20 62 6e 65 |ven?.   |     bne|
|00004c30| 2e 73 20 48 41 4c 46 44 | 4f 4e 45 09 09 20 20 20 |.s HALFD|ONE..   |
|00004c40| 20 20 20 20 20 3b 20 6e | 6f 70 65 20 2d 2d 20 6f |     ; n|ope -- o|
|00004c50| 75 72 20 77 6f 72 6b 20 | 68 65 72 65 20 69 73 20 |ur work |here is |
|00004c60| 64 6f 6e 65 0d 20 20 20 | 20 20 20 20 20 62 74 73 |done.   |     bts|
|00004c70| 74 20 23 30 2c 44 37 09 | 09 20 20 20 20 20 20 20 |t #0,D7.|.       |
|00004c80| 20 3b 20 68 6f 77 20 61 | 62 6f 75 74 20 74 68 69 | ; how a|bout thi|
|00004c90| 73 20 6f 6e 65 3f 0d 20 | 20 20 20 20 20 20 20 62 |s one?. |       b|
|00004ca0| 6e 65 2e 73 20 48 41 4c | 46 44 4f 4e 45 09 09 20 |ne.s HAL|FDONE.. |
|00004cb0| 20 20 20 20 20 20 20 3b | 20 68 61 76 65 20 74 6f |       ;| have to|
|00004cc0| 20 68 61 76 65 20 62 6f | 74 68 20 65 76 65 6e 0d | have bo|th even.|
|00004cd0| 0d 20 20 20 20 20 20 20 | 20 6c 73 6c 2e 77 20 23 |.       | lsl.w #|
|00004ce0| 31 2c 44 31 09 09 20 20 | 20 20 20 20 20 20 3b 20 |1,D1..  |      ; |
|00004cf0| 63 61 6e 20 77 65 20 6b | 65 65 70 20 6d 61 78 20 |can we k|eep max |
|00004d00| 72 6f 77 20 6e 75 6d 62 | 65 72 20 69 6e 20 61 20 |row numb|er in a |
|00004d10| 68 61 6c 66 77 6f 72 64 | 3f 0d 20 20 20 20 20 20 |halfword|?.      |
|00004d20| 20 20 62 63 73 2e 73 20 | 48 41 4c 46 44 4f 4e 45 |  bcs.s |HALFDONE|
|00004d30| 09 09 20 20 20 20 20 20 | 20 20 3b 20 6e 6f 70 65 |..      |  ; nope|
|00004d40| 20 2d 2d 20 44 32 20 6d | 75 73 74 6e 27 74 20 67 | -- D2 m|ustn't g|
|00004d50| 65 74 20 61 6e 79 20 73 | 6d 61 6c 6c 65 72 21 0d |et any s|maller!.|
|00004d60| 0d 20 20 20 20 20 20 20 | 20 6c 73 72 2e 77 20 23 |.       | lsr.w #|
|00004d70| 31 2c 44 34 09 09 20 20 | 20 20 20 20 20 20 3b 20 |1,D4..  |      ; |
|00004d80| 68 61 6c 76 65 20 65 61 | 63 68 20 73 74 72 69 64 |halve ea|ch strid|
|00004d90| 65 2e 2e 2e 0d 20 20 20 | 20 20 20 20 20 6c 73 72 |e....   |     lsr|
|00004da0| 2e 77 20 23 31 2c 44 37 | 09 09 20 20 20 20 20 20 |.w #1,D7|..      |
|00004db0| 20 20 3b 20 2e 2e 2e 6c | 69 6b 65 20 74 68 69 73 |  ; ...l|ike this|
|00004dc0| 0d 20 20 20 20 20 20 20 | 20 73 75 62 2e 77 20 23 |.       | sub.w #|
|00004dd0| 31 2c 44 32 09 09 20 20 | 20 20 20 20 20 20 3b 20 |1,D2..  |      ; |
|00004de0| 61 6e 64 20 72 65 6d 65 | 6d 62 65 72 20 6e 6f 74 |and reme|mber not|
|00004df0| 20 74 6f 20 73 68 69 66 | 74 20 64 6f 77 6e 20 61 | to shif|t down a|
|00004e00| 73 20 66 61 72 0d 20 20 | 20 20 20 20 20 20 62 6e |s far.  |      bn|
|00004e10| 65 2e 73 20 48 41 4c 46 | 4c 4f 4f 50 09 09 20 20 |e.s HALF|LOOP..  |
|00004e20| 20 20 20 20 20 20 3b 20 | 6c 6f 6f 70 20 75 6e 6c |      ; |loop unl|
|00004e30| 65 73 73 20 77 65 27 72 | 65 20 64 6f 77 6e 20 74 |ess we'r|e down t|
|00004e40| 6f 20 6e 6f 20 73 68 69 | 66 74 20 61 74 20 61 6c |o no shi|ft at al|
|00004e50| 6c 0d 0d 48 41 4c 46 44 | 4f 4e 45 3a 09 09 09 20 |l..HALFD|ONE:... |
|00004e60| 20 20 20 20 20 20 20 3b | 20 6e 6f 20 74 61 63 6b |       ;| no tack|
|00004e70| 79 20 70 6c 61 74 69 74 | 75 64 65 73 2c 20 70 6c |y platit|udes, pl|
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|00004ea0| 53 74 72 69 64 65 28 41 | 36 29 20 20 20 3b 20 70 |Stride(A|6)   ; p|
|00004eb0| 75 74 20 62 61 63 6b 20 | 73 6f 75 72 63 65 20 73 |ut back |source s|
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|00004ee0| 6f 53 74 72 69 64 65 28 | 41 36 29 20 20 20 3b 20 |oStride(|A6)   ; |
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|00004f30| 68 65 20 66 61 63 74 20 | 74 68 61 74 20 28 41 6e |he fact |that (An|
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|00004f50| 63 63 65 73 73 0d 3b 20 | 74 68 61 6e 20 64 28 41 |ccess.; |than d(A|
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|00004f70| 77 65 27 6c 6c 20 6d 69 | 73 75 73 65 20 6f 75 72 |we'll mi|suse our|
|00004f80| 20 66 72 61 6d 65 20 70 | 6f 69 6e 74 65 72 2c 20 | frame p|ointer, |
|00004f90| 62 75 74 20 64 6f 6e 27 | 74 20 77 6f 72 72 79 20 |but don'|t worry |
|00004fa0| 2d 2d 20 77 65 27 6c 6c | 0d 3b 20 72 65 73 74 6f |-- we'll|.; resto|
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|00004fc0| 75 73 65 20 69 74 20 61 | 67 61 69 6e 2e 0d 3b 0d |use it a|gain..;.|
|00004fd0| 0d 20 20 20 20 20 20 20 | 20 6d 6f 76 65 2e 77 20 |.       | move.w |
|00004fe0| 73 72 63 4f 75 72 73 2b | 6f 53 74 72 69 64 65 28 |srcOurs+|oStride(|
|00004ff0| 41 36 29 2c 41 35 20 20 | 20 3b 20 6d 61 6b 65 20 |A6),A5  | ; make |
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|00005020| 74 6f 6f 0d 20 20 20 20 | 20 20 20 20 6d 6f 76 65 |too.    |    move|
|00005030| 2e 6c 20 41 36 2c 2d 28 | 53 50 29 09 09 20 20 20 |.l A6,-(|SP)..   |
|00005040| 20 20 20 20 20 3b 20 73 | 61 76 65 20 66 72 61 6d |     ; s|ave fram|
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|00005060| 20 20 20 20 6d 6f 76 65 | 2e 77 20 64 73 74 4f 75 |    move|.w dstOu|
|00005070| 72 73 2b 6f 53 74 72 69 | 64 65 28 41 36 29 2c 41 |rs+oStri|de(A6),A|
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|000050a0| 0d 20 20 20 20 20 20 20 | 20 6d 6f 76 65 2e 6c 20 |.       | move.l |
|000050b0| 23 30 2c 44 36 09 09 20 | 20 20 20 20 20 20 20 3b |#0,D6.. |       ;|
|000050c0| 20 77 65 20 64 6f 20 6f | 6e 6c 79 20 41 4e 44 2e | we do o|nly AND.|
|000050d0| 57 20 78 2c 44 36 20 2d | 2d 20 62 75 74 20 41 44 |W x,D6 -|- but AD|
|000050e0| 44 2e 4c 20 44 36 2c 78 | 0d 0d 20 20 20 20 20 20 |D.L D6,x|..      |
|000050f0| 20 20 63 6c 72 2e 77 20 | 2d 28 53 50 29 09 09 20 |  clr.w |-(SP).. |
|00005100| 20 20 20 20 20 20 20 3b | 20 72 65 73 65 72 76 65 |       ;| reserve|
|00005110| 20 72 6f 6f 6d 20 66 6f | 72 20 66 75 6e 63 74 69 | room fo|r functi|
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|00005130| 20 20 62 73 72 20 4d 55 | 4c 43 48 4b 09 09 20 20 |  bsr MU|LCHK..  |
|00005140| 20 20 20 20 20 20 3b 20 | 67 6f 20 73 65 65 20 69 |      ; |go see i|
|00005150| 66 20 73 74 72 69 64 65 | 73 20 61 72 65 20 70 6f |f stride|s are po|
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|00005170| 20 20 20 20 74 73 74 2e | 77 20 28 53 50 29 2b 09 |    tst.|w (SP)+.|
|00005180| 09 20 20 20 20 20 20 20 | 20 3b 20 63 61 6e 20 77 |.       | ; can w|
|00005190| 65 20 65 6c 69 6d 69 6e | 61 74 65 20 74 68 65 20 |e elimin|ate the |
|000051a0| 68 6f 72 72 69 62 6c 65 | 20 4d 55 4c 55 73 3f 0d |horrible| MULUs?.|
|000051b0| 20 20 20 20 20 20 20 20 | 62 6e 65 20 20 4e 4f 4d |        |bne  NOM|
|000051c0| 55 4c 09 09 20 20 20 20 | 20 20 20 20 3b 20 79 65 |UL..    |    ; ye|
|000051d0| 73 21 20 20 68 75 72 72 | 61 79 21 0d 0d 3b 0d 3b |s!  hurr|ay!..;.;|
|000051e0| 20 6d 61 69 6e 20 6c 6f | 6f 70 3a 20 6d 61 70 20 | main lo|op: map |
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|00005fc0| 20 20 20 20 20 3b 20 69 | 66 20 6e 6f 20 63 61 72 |     ; i|f no car|
|00005fd0| 72 79 20 6f 75 74 2c 20 | 62 75 74 20 6e 6f 74 20 |ry out, |but not |
|00005fe0| 7a 65 72 6f 2c 20 6c 6f | 6f 70 0d 20 20 20 20 20 |zero, lo|op.     |
|00005ff0| 20 20 20 65 6f 72 2e 6c | 20 44 33 2c 44 30 09 09 |   eor.l| D3,D0..|
|00006000| 20 20 20 20 20 20 20 20 | 3b 20 66 6c 69 70 20 6d |        |; flip m|
|00006010| 61 67 69 63 20 62 69 74 | 73 2e 2e 2e 0d 20 20 20 |agic bit|s....   |
|00006020| 20 20 20 20 20 63 6d 70 | 2e 6c 20 44 33 2c 44 30 |     cmp|.l D3,D0|
|00006030| 09 09 20 20 20 20 20 20 | 20 20 3b 20 2e 2e 2e 62 |..      |  ; ...b|
|00006040| 75 74 20 68 61 73 20 74 | 68 69 73 20 62 72 6f 75 |ut has t|his brou|
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|00006060| 20 31 3f 0d 20 20 20 20 | 20 20 20 20 62 6e 65 2e | 1?.    |    bne.|
|00006070| 73 20 4c 4f 4f 50 09 09 | 20 20 20 20 20 20 20 20 |s LOOP..|        |
|00006080| 3b 20 69 66 20 6e 6f 74 | 2c 20 6c 6f 6f 70 20 62 |; if not|, loop b|
|00006090| 61 63 6b 3b 20 65 6c 73 | 65 20 66 61 6c 6c 20 74 |ack; els|e fall t|
|000060a0| 68 72 6f 75 67 68 0d 0d | 0d 3b 0d 3b 20 68 65 72 |hrough..|.;.; her|
|000060b0| 65 20 77 68 65 6e 20 77 | 65 27 72 65 20 64 6f 6e |e when w|e're don|
|000060c0| 65 3b 20 74 68 65 20 28 | 30 2c 30 29 20 70 6f 69 |e; the (|0,0) poi|
|000060d0| 6e 74 20 68 61 73 20 6e | 6f 74 20 62 65 65 6e 20 |nt has n|ot been |
|000060e0| 64 6f 6e 65 20 79 65 74 | 2e 20 20 74 68 69 73 20 |done yet|.  this |
|000060f0| 69 73 0d 3b 20 72 65 61 | 6c 6c 79 20 74 68 65 20 |is.; rea|lly the |
|00006100| 28 30 2c 6c 65 66 74 20 | 6d 61 72 67 69 6e 29 20 |(0,left |margin) |
|00006110| 70 6f 69 6e 74 2e 20 20 | 77 65 20 61 6c 73 6f 20 |point.  |we also |
|00006120| 6a 75 6d 70 20 68 65 72 | 65 20 66 72 6f 6d 20 61 |jump her|e from a|
|00006130| 6e 6f 74 68 65 72 20 63 | 6f 70 79 20 6c 6f 6f 70 |nother c|opy loop|
|00006140| 2e 0d 3b 0d 0d 44 4f 4e | 45 3a 0d 20 20 20 20 20 |..;..DON|E:.     |
|00006150| 20 20 20 6d 6f 76 65 2e | 6c 20 28 53 50 29 2b 2c |   move.|l (SP)+,|
|00006160| 41 36 09 09 20 20 20 20 | 20 20 20 20 3b 20 72 65 |A6..    |    ; re|
|00006170| 73 74 6f 72 65 20 73 74 | 61 63 6b 20 66 72 61 6d |store st|ack fram|
|00006180| 65 20 70 6f 69 6e 74 65 | 72 0d 0d 20 20 20 20 20 |e pointe|r..     |
|00006190| 20 20 20 6d 6f 76 65 2e | 77 20 73 72 63 4f 75 72 |   move.|w srcOur|
|000061a0| 73 2b 6f 4c 62 69 74 73 | 28 41 36 29 2c 44 30 20 |s+oLbits|(A6),D0 |
|000061b0| 20 20 20 3b 20 70 69 63 | 6b 20 75 70 20 62 69 74 |   ; pic|k up bit|
|000061c0| 20 6f 66 66 73 65 74 20 | 6f 66 20 6c 65 66 74 20 | offset |of left |
|000061d0| 6d 61 72 67 69 6e 0d 20 | 20 20 20 20 20 20 20 6d |margin. |       m|
|000061e0| 6f 76 65 2e 77 20 64 73 | 74 4f 75 72 73 2b 6f 4c |ove.w ds|tOurs+oL|
|000061f0| 62 69 74 73 28 41 36 29 | 2c 44 31 20 20 20 20 3b |bits(A6)|,D1    ;|
|00006200| 20 61 6e 64 20 64 69 74 | 74 6f 20 66 6f 72 20 74 | and dit|to for t|
|00006210| 61 72 67 65 74 0d 20 20 | 20 20 20 20 20 20 6e 6f |arget.  |      no|
|00006220| 74 2e 62 20 44 30 09 09 | 20 20 20 20 20 20 20 20 |t.b D0..|        |
|00006230| 3b 20 66 6c 69 70 20 74 | 6f 20 6e 75 6d 62 65 72 |; flip t|o number|
|00006240| 20 74 68 65 20 62 69 74 | 73 20 66 6f 72 20 36 38 | the bit|s for 68|
|00006250| 30 30 30 0d 20 20 20 20 | 20 20 20 20 6e 6f 74 2e |000.    |    not.|
|00006260| 62 20 44 31 09 09 20 20 | 20 20 20 20 20 20 3b 20 |b D1..  |      ; |
|00006270| 64 69 74 74 6f 0d 0d 3b | 20 61 6c 74 65 72 6e 61 |ditto..;| alterna|
|00006280| 74 65 2c 20 6c 61 74 65 | 20 65 6e 74 72 61 6e 63 |te, late| entranc|
|00006290| 65 2c 20 77 68 65 6e 20 | 53 43 52 45 45 4e 20 72 |e, when |SCREEN r|
|000062a0| 6f 75 74 69 6e 65 20 68 | 61 73 20 61 6c 72 65 61 |outine h|as alrea|
|000062b0| 64 79 20 73 65 74 20 75 | 70 20 44 30 20 61 6e 64 |dy set u|p D0 and|
|000062c0| 20 44 31 20 28 69 74 20 | 64 6f 65 73 6e 27 74 20 | D1 (it |doesn't |
|000062d0| 77 61 6e 74 20 74 68 65 | 20 62 69 74 0d 3b 20 6f |want the| bit.; o|
|000062e0| 66 66 73 65 74 20 6e 65 | 67 61 74 65 64 29 2e 0d |ffset ne|gated)..|
|000062f0| 0d 44 4f 4e 45 41 3a 09 | 09 09 09 20 20 20 20 20 |.DONEA:.|...     |
|00006300| 20 20 20 3b 20 6c 61 6e | 64 20 68 65 72 65 20 77 |   ; lan|d here w|
|00006310| 69 74 68 20 44 30 2c 20 | 44 31 20 73 65 74 0d 20 |ith D0, |D1 set. |
|00006320| 20 20 20 20 20 20 20 6d | 6f 76 65 2e 6c 20 73 72 |       m|ove.l sr|
|00006330| 63 4f 75 72 73 2b 6f 42 | 61 73 65 28 41 36 29 2c |cOurs+oB|ase(A6),|
|00006340| 41 30 20 20 20 20 20 3b | 20 73 65 74 20 75 70 20 |A0     ;| set up |
|00006350| 62 61 73 65 20 70 6f 69 | 6e 74 65 72 20 66 6f 72 |base poi|nter for|
|00006360| 20 6f 75 72 20 73 6f 75 | 72 63 65 20 62 69 74 73 | our sou|rce bits|
|00006370| 0d 20 20 20 20 20 20 20 | 20 6d 6f 76 65 2e 6c 20 |.       | move.l |
|00006380| 64 73 74 4f 75 72 73 2b | 6f 42 61 73 65 28 41 36 |dstOurs+|oBase(A6|
|00006390| 29 2c 41 31 20 20 20 20 | 20 3b 20 61 6e 64 20 70 |),A1    | ; and p|
|000063a0| 6f 69 6e 74 65 72 20 66 | 6f 72 20 74 61 72 67 65 |ointer f|or targe|
|000063b0| 74 0d 0d 20 20 20 20 20 | 20 20 20 62 73 65 74 20 |t..     |   bset |
|000063c0| 44 31 2c 28 41 31 29 09 | 09 20 20 20 20 20 20 20 |D1,(A1).|.       |
|000063d0| 20 3b 20 61 73 73 75 6d | 65 20 73 6f 75 72 63 65 | ; assum|e source|
|000063e0| 20 62 69 74 20 77 61 73 | 20 6f 6e 3b 20 73 65 74 | bit was| on; set|
|000063f0| 20 74 61 72 67 65 74 0d | 20 20 20 20 20 20 20 20 | target.|        |
+--------+-------------------------+-------------------------+--------+--------+
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