QuickTime 2.0 Developer Kit

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/ QuickTime 2.0 Developer Kit / QuickTime 2.0 Developer Kit.iso / mac / MAC / Programming Stuff / Macintosh Debugging / EvenBetterBusError / EvenBetterBusError Read Me / EvenBetterBusError Read Me
Unknown | 1992-10-27 | 3.7 KB | [ONLN/HLX2]
open in:
MacOS 8.1 |
Win98 |
DOS
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Confidence	Program	Detection	Match Type
`100%`	file	data	default
`100%`	gt2	Kopftext: 'EvenBetterBusError - a system extension to help catch renegade references to NIL...	default (weak)
`100%`	detectItEasy	Format: plain text[LF]	default (weak)
id metadata
key	value
macFileType	`[ONLN]`
macFileCreator	`[HLX2]`
hex view
+--------+-------------------------+-------------------------+--------+--------+
|00000000| 45 76 65 6e 42 65 74 74 | 65 72 42 75 73 45 72 72 |EvenBett|erBusErr|
|00000010| 6f 72 20 2d 20 61 20 73 | 79 73 74 65 6d 20 65 78 |or - a s|ystem ex|
|00000020| 74 65 6e 73 69 6f 6e 20 | 74 6f 20 68 65 6c 70 20 |tension |to help |
|00000030| 63 61 74 63 68 20 72 65 | 6e 65 67 61 64 65 20 72 |catch re|negade r|
|00000040| 65 66 65 72 65 6e 63 65 | 73 20 74 6f 20 4e 49 4c |eference|s to NIL|
|00000050| 2e 2e 2e 0d 4d 61 6e 79 | 20 6f 66 20 79 6f 75 20 |....Many| of you |
|00000060| 68 61 76 65 20 68 65 61 | 72 64 20 6f 66 20 4d 72 |have hea|rd of Mr|
|00000070| 2e 20 42 75 73 45 72 72 | 6f 72 2c 20 61 20 73 79 |. BusErr|or, a sy|
|00000080| 73 74 65 6d 20 65 78 74 | 65 6e 73 69 6f 6e 20 64 |stem ext|ension d|
|00000090| 65 73 69 67 6e 65 64 20 | 74 6f 20 68 65 6c 70 20 |esigned |to help |
|000000a0| 63 61 74 63 68 20 70 72 | 6f 67 72 61 6d 73 20 74 |catch pr|ograms t|
|000000b0| 68 61 74 20 64 65 2d 72 | 65 66 65 72 65 6e 63 65 |hat de-r|eference|
|000000c0| 20 4e 49 4c 20 28 74 68 | 69 6e 6b 69 6e 67 20 69 | NIL (th|inking i|
|000000d0| 74 20 6d 69 67 68 74 20 | 62 65 20 61 20 76 61 6c |t might |be a val|
|000000e0| 69 64 20 68 61 6e 64 6c | 65 2e 2e 2e 29 2e 20 20 |id handl|e...).  |
|000000f0| 4d 72 2e 20 42 75 73 45 | 72 72 6f 72 20 70 65 72 |Mr. BusE|rror per|
|00000100| 69 6f 64 69 63 61 6c 6c | 79 20 77 72 69 74 65 73 |iodicall|y writes|
|00000110| 20 61 20 76 61 6c 75 65 | 20 74 6f 20 6c 6f 63 61 | a value| to loca|
|00000120| 74 69 6f 6e 20 7a 65 72 | 6f 20 77 68 69 63 68 2c |tion zer|o which,|
|00000130| 20 69 66 20 64 65 72 65 | 66 65 72 65 6e 63 65 64 | if dere|ferenced|
|00000140| 2c 20 77 69 6c 6c 20 63 | 61 75 73 65 20 61 20 62 |, will c|ause a b|
|00000150| 75 73 20 65 72 72 6f 72 | 20 6f 72 20 61 64 64 72 |us error| or addr|
|00000160| 65 73 73 20 65 72 72 6f | 72 2e 20 20 41 63 74 75 |ess erro|r.  Actu|
|00000170| 61 6c 6c 79 2c 20 74 68 | 6f 75 67 68 2c 20 74 68 |ally, th|ough, th|
|00000180| 65 20 76 61 6c 75 65 20 | 77 68 69 63 68 20 4d 72 |e value |which Mr|
|00000190| 2e 20 42 75 73 45 72 72 | 6f 72 20 73 74 75 66 66 |. BusErr|or stuff|
|000001a0| 73 20 69 6e 74 6f 20 6c | 6f 63 61 74 69 6f 6e 20 |s into l|ocation |
|000001b0| 7a 65 72 6f 20 77 69 6c | 6c 20 6f 6e 6c 79 20 63 |zero wil|l only c|
|000001c0| 61 75 73 65 20 62 75 73 | 20 65 72 72 6f 72 73 20 |ause bus| errors |
|000001d0| 6f 6e 20 6d 61 63 68 69 | 6e 65 73 20 72 75 6e 6e |on machi|nes runn|
|000001e0| 69 6e 67 20 69 6e 20 32 | 34 2d 62 69 74 20 6d 6f |ing in 2|4-bit mo|
|000001f0| 64 65 2e 20 20 49 74 20 | 64 6f 65 73 6e 27 74 20 |de.  It |doesn't |
|00000200| 63 61 75 73 65 20 61 20 | 62 75 73 20 65 72 72 6f |cause a |bus erro|
|00000210| 72 20 69 6e 20 33 32 2d | 62 69 74 20 6d 6f 64 65 |r in 32-|bit mode|
|00000220| 2e 0d 53 6f 2c 20 61 6c | 6f 6e 67 20 63 6f 6d 65 |..So, al|ong come|
|00000230| 73 20 42 65 74 74 65 72 | 42 75 73 45 72 72 6f 72 |s Better|BusError|
|00000240| 2e 20 20 49 74 20 64 6f | 65 73 20 70 72 65 74 74 |.  It do|es prett|
|00000250| 79 20 6d 75 63 68 20 74 | 68 65 20 73 61 6d 65 20 |y much t|he same |
|00000260| 74 68 69 6e 67 20 4d 72 | 2e 20 42 75 73 45 72 72 |thing Mr|. BusErr|
|00000270| 6f 72 20 64 6f 65 73 2c | 20 65 78 63 65 70 74 20 |or does,| except |
|00000280| 66 6f 72 20 74 77 6f 20 | 74 68 69 6e 67 73 2e 20 |for two |things. |
|00000290| 20 46 69 72 73 74 2c 20 | 74 68 65 20 76 61 6c 75 | First, |the valu|
|000002a0| 65 20 69 74 20 73 74 75 | 66 66 73 20 69 6e 74 6f |e it stu|ffs into|
|000002b0| 20 6c 6f 63 61 74 69 6f | 6e 20 7a 65 72 6f 20 69 | locatio|n zero i|
|000002c0| 73 20 61 20 22 62 61 64 | 22 20 61 64 64 72 65 73 |s a "bad|" addres|
|000002d0| 73 20 69 6e 20 33 32 2d | 62 69 74 20 6d 6f 64 65 |s in 32-|bit mode|
|000002e0| 20 61 73 20 77 65 6c 6c | 20 61 73 20 32 34 2d 62 | as well| as 24-b|
|000002f0| 69 74 20 6d 6f 64 65 2e | 20 20 53 65 63 6f 6e 64 |it mode.|  Second|
|00000300| 2c 20 69 74 20 61 6c 73 | 6f 20 63 68 65 63 6b 73 |, it als|o checks|
|00000310| 20 74 6f 20 73 65 65 20 | 69 66 20 61 6e 79 6f 6e | to see |if anyon|
|00000320| 65 20 68 61 73 20 77 72 | 69 74 74 65 6e 20 64 61 |e has wr|itten da|
|00000330| 74 61 20 74 6f 20 6c 6f | 63 61 74 69 6f 6e 20 7a |ta to lo|cation z|
|00000340| 65 72 6f 20 28 61 6e 6f | 74 68 65 72 20 63 6f 6d |ero (ano|ther com|
|00000350| 6d 6f 6e 20 70 72 6f 67 | 72 61 6d 6d 69 6e 67 20 |mon prog|ramming |
|00000360| 6d 69 73 74 61 6b 65 29 | 2e 20 20 53 6f 20 66 61 |mistake)|.  So fa|
|00000370| 72 2c 20 73 6f 20 67 6f | 6f 64 2e 2e 2e 0d 57 65 |r, so go|od....We|
|00000380| 6c 6c 2c 20 75 6e 66 6f | 72 74 75 6e 61 74 65 6c |ll, unfo|rtunatel|
|00000390| 79 2c 20 74 68 65 20 6d | 65 6d 6f 72 79 20 6d 61 |y, the m|emory ma|
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|000003b0| 62 69 74 20 63 6c 65 61 | 6e 20 52 4f 4d 73 20 68 |bit clea|n ROMs h|
|000003c0| 61 73 20 61 20 62 75 67 | 20 77 68 69 63 68 20 63 |as a bug| which c|
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|000003f0| 65 72 6f 20 65 76 65 72 | 79 20 74 69 6d 65 20 53 |ero ever|y time S|
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|00000410| 6c 65 64 20 77 68 69 6c | 65 20 72 75 6e 6e 69 6e |led whil|e runnin|
|00000420| 67 20 69 6e 20 32 34 2d | 62 69 74 20 6d 6f 64 65 |g in 24-|bit mode|
|00000430| 2e 20 20 54 68 69 73 20 | 63 61 75 73 65 73 20 42 |.  This |causes B|
|00000440| 65 74 74 65 72 42 75 73 | 45 72 72 6f 72 20 74 6f |etterBus|Error to|
|00000450| 20 62 72 65 61 6b 20 69 | 6e 74 6f 20 74 68 65 20 | break i|nto the |
|00000460| 64 65 62 75 67 67 65 72 | 20 73 68 6f 75 74 69 6e |debugger| shoutin|
|00000470| 67 20 d2 57 72 69 74 65 | 20 74 6f 20 4e 49 4c 21 |g .Write| to NIL!|
|00000480| d3 2e 20 20 41 63 74 75 | 61 6c 6c 79 2c 20 69 74 |..  Actu|ally, it|
|00000490| 27 73 20 6f 6e 6c 79 20 | 74 68 65 20 d2 68 69 67 |'s only |the .hig|
|000004a0| 68 d3 20 62 69 74 20 6f | 66 20 74 68 65 20 6c 6f |h. bit o|f the lo|
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|000004c0| 65 72 6f 20 77 68 69 63 | 68 20 69 73 20 63 68 61 |ero whic|h is cha|
|000004d0| 6e 67 65 64 20 28 74 68 | 65 20 6d 65 6d 6f 72 79 |nged (th|e memory|
|000004e0| 20 6d 61 6e 61 67 65 72 | 20 69 73 20 d2 6c 6f 63 | manager| is .loc|
|000004f0| 6b 69 6e 67 d3 20 74 68 | 65 20 d2 68 61 6e 64 6c |king. th|e .handl|
|00000500| 65 d3 20 28 77 68 69 63 | 68 20 69 73 6e d5 74 20 |e. (whic|h isn.t |
|00000510| 74 68 65 72 65 2e 2e 2e | 29 2e 0d 45 76 65 6e 42 |there...|)..EvenB|
|00000520| 65 74 74 65 72 42 75 73 | 45 72 72 6f 72 20 28 45 |etterBus|Error (E|
|00000530| 42 42 45 29 20 74 6f 20 | 74 68 65 20 72 65 73 63 |BBE) to |the resc|
|00000540| 75 65 21 20 20 45 42 42 | 45 20 64 6f 65 73 20 65 |ue!  EBB|E does e|
|00000550| 76 65 72 79 74 68 69 6e | 67 20 74 68 65 20 6f 74 |verythin|g the ot|
|00000560| 68 65 72 20 74 77 6f 20 | 65 78 74 65 6e 73 69 6f |her two |extensio|
|00000570| 6e 73 20 64 6f 2c 20 61 | 6e 64 20 61 6c 73 6f 20 |ns do, a|nd also |
|00000580| 6b 6e 6f 77 73 20 74 6f | 20 69 67 6e 6f 72 65 20 |knows to| ignore |
|00000590| 74 68 65 20 68 69 67 68 | 20 62 69 74 20 61 74 20 |the high| bit at |
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|000005c0| 6c 6c 20 63 68 61 6e 67 | 65 20 69 74 2e 2e 2e 0d |ll chang|e it....|
|000005d0| 45 6e 6a 6f 79 2e 0d 47 | 72 65 67 20 4d 61 72 72 |Enjoy..G|reg Marr|
|000005e0| 69 6f 74 74 0d 08 be 00 | 00 00 00 02 d7 02 23 00 |iott....|......#.|
|000005f0| 11 02 ff 0c 00 ff ff ff | ff 00 00 00 00 00 00 00 |........|........|
|00000600| 00 02 23 00 00 02 d7 00 | 00 00 00 00 00 00 1e 00 |..#.....|........|
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|00000680| 74 6f 20 68 65 6c 70 20 | 63 61 74 63 68 20 72 65 |to help |catch re|
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|00000d50| 68 65 72 65 2e 2e 2e 29 | 2e 00 a1 00 64 00 10 4f |here...)|....d..O|
|00000d60| 4e 4c 4e 00 64 05 1b 01 | 91 00 3c 01 a0 01 e9 00 |NLN.d...|..<.....|
|00000d70| 2a 1e 48 45 76 65 6e 42 | 65 74 74 65 72 42 75 73 |*.HEvenB|etterBus|
|00000d80| 45 72 72 6f 72 20 28 45 | 42 42 45 29 20 74 6f 20 |Error (E|BBE) to |
|00000d90| 74 68 65 20 72 65 73 63 | 75 65 21 20 20 45 42 42 |the resc|ue!  EBB|
|00000da0| 45 20 64 6f 65 73 20 65 | 76 65 72 79 74 68 69 6e |E does e|verythin|
|00000db0| 67 20 74 68 65 20 6f 74 | 68 65 72 00 a1 00 64 00 |g the ot|her...d.|
|00000dc0| 10 4f 4e 4c 4e 00 64 05 | 64 01 a0 00 3c 01 af 01 |.ONLN.d.|d...<...|
|00000dd0| d5 00 2a 0f 4a 74 77 6f | 20 65 78 74 65 6e 73 69 |..*.Jtwo| extensi|
|00000de0| 6f 6e 73 20 64 6f 2c 20 | 61 6e 64 20 61 6c 73 6f |ons do, |and also|
|00000df0| 20 6b 6e 6f 77 73 20 74 | 6f 20 69 67 6e 6f 72 65 | knows t|o ignore|
|00000e00| 20 74 68 65 20 68 69 67 | 68 20 62 69 74 20 61 74 | the hig|h bit at|
|00000e10| 20 7a 65 72 6f 20 73 69 | 6e 63 65 20 74 68 65 00 | zero si|nce the.|
|00000e20| a1 00 64 00 10 4f 4e 4c | 4e 00 64 05 af 01 af 00 |..d..ONL|N.d.....|
|00000e30| 3c 01 be 00 f8 00 2a 0f | 20 6d 65 6d 6f 72 79 20 |<.....*.| memory |
|00000e40| 6d 61 6e 61 67 65 72 20 | 77 69 6c 6c 20 63 68 61 |manager |will cha|
|00000e50| 6e 67 65 20 69 74 2e 2e | 2e 00 a1 00 64 00 10 4f |nge it..|....d..O|
|00000e60| 4e 4c 4e 00 64 05 d0 01 | cd 00 3c 01 dc 00 60 00 |NLN.d...|..<...`.|
|00000e70| 2a 1e 06 45 6e 6a 6f 79 | 2e 00 a1 00 64 00 10 4f |*..Enjoy|....d..O|
|00000e80| 4e 4c 4e 00 64 05 d7 01 | dc 00 3c 01 eb 00 8a 00 |NLN.d...|..<.....|
|00000e90| 2a 0f 0d 47 72 65 67 20 | 4d 61 72 72 69 6f 74 74 |*..Greg |Marriott|
|00000ea0| 00 00 ff                |                         |...     |        |
+--------+-------------------------+-------------------------+--------+--------+