/ BBS in a Box 5 / BBS in a Box -Volume V (BBS in a Box) (April 1992).iso / Files / MacTechNotes / TN.201.250 / TN.228.Swapping MMU Mode

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|00000bd0| 95 a9 60 25 52 93 57 7f | 35 bc b2 ab 4e 70 22 8e |..`%R.W.|5...Np".|
|00000be0| fa a6 0e 8c 05 76 92 e6 | c8 82 70 27 70 8b 08 b0 |.....v..|..p'p...|
|00000bf0| b1 93 73 4c 0a 77 f3 c9 | 6b 1d 89 a6 f0 5d 85 8e |..sL.w..|k....]..|
|00000c00| 18 a8 68 d9 51 a1 13 f4 | 66 16 92 84 66 1f 6f 57 |..h.Q...|f...f.oW|
|00000c10| a6 6e aa b6 b5 48 eb fc | 09 69 05 5a d4 00 63 4d |.n...H..|.i.Z..cM|
|00000c20| 36 65 7f 15 c9 9b 99 5a | 59 8d 6c fc 90 df 4a 10 |6e.....Z|Y.l...J.|
|00000c30| 57 44 02 ad 45 01 f5 07 | d5 28 0c ae 5b 87 dc 4b |WD..E...|.(..[..K|
|00000c40| 97 94 81 ae 4f 89 57 27 | 00 55 2f 91 52 ab fb bc |....O.W'|.U/.R...|
|00000c50| 78 43 aa 02 96 c4 86 df | 43 c3 68 1a 44 24 4a df |xC......|C.h.D$J.|
|00000c60| 15 ad db a8 06 fa 57 2b | c8 60 46 e9 0a 10 cf 27 |......W+|.`F....'|
|00000c70| a0 16 83 3a 45 5d 7b 20 | a0 0a 49 61 9b 95 1f c8 |...:E]{ |..Ia....|
|00000c80| c1 3b e9 32 b8 ab e5 e8 | bf d3 ae 62 82 67 ad f5 |.;.2....|...b.g..|
|00000c90| 3e 9c f3 fc a8 7a b0 aa | f1 75 b4 d9 45 22 42 19 |>....z..|.u..E"B.|
|00000ca0| b0 29 a1 8d 31 51 13 88 | fa 2f 5b 0a d1 18 e4 de |.)..1Q..|./[.....|
|00000cb0| 66 de d5 0f 18 05 45 e7 | c0 58 60 27 b3 1d 0a d1 |f.....E.|.X`'....|
|00000cc0| 0c 83 bd 8b 36 03 07 42 | d1 f2 9a e0 00 00 00 00 |....6..B|........|
|00000cd0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000ce0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000cf0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000d00| 00 00 01 00 00 00 04 d0 | 00 00 03 d0 00 00 00 69 |........|.......i|
|00000d10| 00 00 00 01 00 00 00 07 | 00 00 00 01 00 00 00 01 |........|........|
|00000d20| 02 00 00 07 00 00 07 e0 | 00 00 07 de 00 00 00 00 |........|........|
|00000d30| 18 54 4e 2e 32 32 38 2e | 53 77 61 70 70 69 6e 67 |.TN.228.|Swapping|
|00000d40| 20 4d 4d 55 20 4d 6f 64 | 65 70 02 00 00 00 44 44 | MMU Mod|ep....DD|
|00000d50| 00 00 44 44 66 34 44 44 | 41 50 01 00 00 8c 01 20 |..DDf4DD|AP..... |
|00000d60| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000d70| 00 00 a0 5a b5 ee 00 00 | 0c 4c 00 00 05 39 00 00 |...Z....|.L...9..|
|00000d80| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000d90| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000da0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000db0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000dc0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000dd0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000de0| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00000df0| 00 00 00 00 00 00 00 00 | c0 00 00 00 00 00 00 00 |........|........|
|00000e00| 00 00 02 c8 54 4e 2e 32 | 32 38 2e 53 77 61 70 70 |....TN.2|28.Swapp|
|00000e10| 69 6e 67 20 4d 4d 55 20 | 4d 6f 64 65 20 2d 20 54 |ing MMU |Mode - T|
|00000e20| 68 69 73 20 54 65 63 68 | 6e 69 63 61 6c 20 4e 6f |his Tech|nical No|
|00000e30| 74 65 20 64 65 73 63 72 | 69 62 65 73 20 68 6f 77 |te descr|ibes how|
|00000e40| 20 74 6f 20 61 76 6f 69 | 64 20 63 72 61 73 68 69 | to avoi|d crashi|
|00000e50| 6e 67 20 77 68 65 6e 20 | 73 77 61 70 70 69 6e 67 |ng when |swapping|
|00000e60| 20 69 6e 74 6f 20 33 32 | 2d 62 69 74 20 6d 6f 64 | into 32|-bit mod|
|00000e70| 65 20 6f 6e 20 61 20 4d | 61 63 69 6e 74 6f 73 68 |e on a M|acintosh|
|00000e80| 20 49 49 2e 20 20 54 68 | 61 6e 6b 73 20 74 6f 20 | II.  Th|anks to |
|00000e90| 4a 69 6d 20 42 65 72 72 | 79 20 61 6e 64 20 44 61 |Jim Berr|y and Da|
|00000ea0| 6e 20 57 65 73 74 6f 6e | 20 66 6f 72 20 70 6f 69 |n Weston| for poi|
|00000eb0| 6e 74 69 6e 67 20 74 68 | 69 73 20 6f 75 74 2e 20 |nting th|is out. |
|00000ec0| 54 68 65 72 65 20 69 73 | 20 61 20 63 6f 6e 64 69 |There is| a condi|
|00000ed0| 74 69 6f 6e 20 77 68 65 | 72 65 20 63 61 6c 6c 69 |tion whe|re calli|
|00000ee0| 6e 67 20 5f 53 77 61 70 | 4d 4d 55 4d 6f 64 65 20 |ng _Swap|MMUMode |
|00000ef0| 74 6f 20 73 77 69 74 63 | 68 20 74 68 65 20 4d 61 |to switc|h the Ma|
|00000f00| 63 69 6e 74 6f 73 68 20 | 49 49 20 69 6e 74 6f 20 |cintosh |II into |
|00000f10| 33 32 2d 62 69 74 20 6d | 6f 64 65 20 63 61 6e 20 |32-bit m|ode can |
|00000f20| 63 61 75 73 65 20 74 68 | 65 20 73 79 73 74 65 6d |cause th|e system|
|00000f30| 20 74 6f 20 63 72 61 73 | 68 2e 20 20 54 68 69 73 | to cras|h.  This|
|00000f40| 20 63 6f 6e 64 69 74 69 | 6f 6e 20 68 61 70 70 65 | conditi|on happe|
|00000f50| 6e 73 20 69 6e 20 63 6f | 64 65 20 77 68 69 63 68 |ns in co|de which|
|00000f60| 20 69 73 20 6c 6f 61 64 | 65 64 20 69 6e 74 6f 20 | is load|ed into |
|00000f70| 6d 65 6d 6f 72 79 20 66 | 72 6f 6d 20 61 20 72 65 |memory f|rom a re|
|00000f80| 73 6f 75 72 63 65 2c 20 | 6f 72 20 69 73 20 70 6c |source, |or is pl|
|00000f90| 61 63 65 64 20 69 6e 20 | 6d 65 6d 6f 72 79 20 74 |aced in |memory t|
|00000fa0| 68 61 74 20 77 61 73 20 | 61 6c 6c 6f 63 61 74 65 |hat was |allocate|
|00000fb0| 64 20 62 79 20 74 68 65 | 20 4d 65 6d 6f 72 79 20 |d by the| Memory |
|00000fc0| 4d 61 6e 61 67 65 72 20 | 61 6e 64 20 69 73 20 73 |Manager |and is s|
|00000fd0| 75 62 73 65 71 75 65 6e | 74 6c 79 20 65 78 65 63 |ubsequen|tly exec|
|00000fe0| 75 74 65 64 20 62 79 20 | 75 73 69 6e 67 20 74 68 |uted by |using th|
|00000ff0| 65 20 6d 61 73 74 65 72 | 20 70 6f 69 6e 74 65 72 |e master| pointer|
|00001000| 20 61 73 20 74 68 65 20 | 61 64 64 72 65 73 73 20 | as the |address |
|00001010| 66 6f 72 20 61 20 4a 53 | 52 20 69 6e 73 74 72 75 |for a JS|R instru|
|00001020| 63 74 69 6f 6e 2e 20 20 | 54 68 69 73 20 63 6f 6e |ction.  |This con|
|00001030| 64 69 74 69 6f 6e 20 69 | 6e 63 6c 75 64 65 73 20 |dition i|ncludes |
|00001040| 73 74 61 6e 64 2d 61 6c | 6f 6e 65 2c 20 65 78 65 |stand-al|one, exe|
|00001050| 63 75 74 61 62 6c 65 20 | 63 6f 64 65 20 72 65 73 |cutable |code res|
|00001060| 6f 75 72 63 65 73 20 28 | 69 2e 65 2e 2c 20 27 58 |ources (|i.e., 'X|
|00001070| 43 4d 44 27 2c 20 27 58 | 46 43 4e 27 2c 20 27 49 |CMD', 'X|FCN', 'I|
|00001080| 4e 49 54 27 2c 20 27 41 | 44 42 53 27 2c 27 46 4b |NIT', 'A|DBS','FK|
|00001090| 45 59 27 2c 20 65 74 63 | 2e 29 2c 20 62 75 74 20 |EY', etc|.), but |
|000010a0| 64 6f 65 73 20 6e 6f 74 | 20 61 70 70 6c 79 20 74 |does not| apply t|
|000010b0| 6f 20 73 74 61 6e 64 61 | 72 64 20 27 43 4f 44 45 |o standa|rd 'CODE|
|000010c0| 27 20 72 65 73 6f 75 72 | 63 65 73 2e 00 00 01 00 |' resour|ces.....|
|000010d0| ff 54 4e 2e 32 32 38 2e | 53 77 61 70 70 69 6e 67 |.TN.228.|Swapping|
|000010e0| 20 4d 4d 55 20 4d 6f 64 | 65 20 2d 20 54 68 69 73 | MMU Mod|e - This|
|000010f0| 20 54 65 63 68 6e 69 63 | 61 6c 20 4e 6f 74 65 20 | Technic|al Note |
|00001100| 64 65 73 63 72 69 62 65 | 73 20 68 6f 77 20 74 6f |describe|s how to|
|00001110| 20 61 76 6f 69 64 20 63 | 72 61 73 68 69 6e 67 20 | avoid c|rashing |
|00001120| 77 68 65 6e 20 73 77 61 | 70 70 69 6e 67 20 69 6e |when swa|pping in|
|00001130| 74 6f 20 33 32 2d 62 69 | 74 20 6d 6f 64 65 20 6f |to 32-bi|t mode o|
|00001140| 6e 20 61 20 4d 61 63 69 | 6e 74 6f 73 68 20 49 49 |n a Maci|ntosh II|
|00001150| 2e 20 20 54 68 61 6e 6b | 73 20 74 6f 20 4a 69 6d |.  Thank|s to Jim|
|00001160| 20 42 65 72 72 79 20 61 | 6e 64 20 44 61 6e 20 57 | Berry a|nd Dan W|
|00001170| 65 73 74 6f 6e 20 66 6f | 72 20 70 6f 69 6e 74 69 |eston fo|r pointi|
|00001180| 6e 67 20 74 68 69 73 20 | 6f 75 74 2e 20 54 68 65 |ng this |out. The|
|00001190| 72 65 20 69 73 20 61 20 | 63 6f 6e 64 69 74 69 6f |re is a |conditio|
|000011a0| 6e 20 77 68 65 72 65 63 | 61 6c 6c 69 6e 67 20 5f |n wherec|alling _|
|000011b0| 53 77 61 70 4d 4d 55 4d | 6f 64 65 20 74 6f 20 73 |SwapMMUM|ode to s|
|000011c0| 77 69 74 63 68 20 74 68 | 65 20 4d 61 63 69 6e 74 |witch th|e Macint|
|000011d0| 00 00 01 00 00 00 04 d0 | 00 00 03 d0 00 00 00 69 |........|.......i|
|000011e0| 00 65 de 74 07 b8 00 00 | 00 1c 00 46 00 01 53 69 |.e.t....|...F..Si|
|000011f0| 74 43 00 00 00 12 46 43 | 4d 54 00 00 00 1e 00 00 |tC....FC|MT......|
|00001200| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 11 00 00 |........|........|
|00001210| 02 cc 00 66 19 54 10 4c | 6f 6e 67 20 44 65 73 63 |...f.T.L|ong Desc|
|00001220| 72 69 70 74 69 6f 6e 11 | 42 72 69 65 66 20 44 65 |ription.|Brief De|
|00001230| 73 63 72 69 70 74 69 6f | 6e 00 00 00 00 00 00 00 |scriptio|n.......|
|00001240| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00001250| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00001260| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
|00001270| 00 00 00 00 00 00 00 00 | 00 00 00 00 00 00 00 00 |........|........|
+--------+-------------------------+-------------------------+--------+--------+