mirror of
https://github.com/JohnSnape/6502code.git
synced 2024-06-02 21:41:43 +00:00
277 lines
14 KiB
Plaintext
277 lines
14 KiB
Plaintext
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0000- 5 ;
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0000- 6 ; Mouse Handler (Apple //c)
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0000- 7 ;
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0000- 8 ; by Christopher A. Mosher
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0000- 9 ;
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0000- 10 ; May, 1987 (updated for ProDOS)
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0000- 11 ; June, 1986
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0000- 12 ;
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0000- 13 ; This program handles the mouse for use
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0000- 14 ; by other programs. It displays a cursor on
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0000- 15 ; the eighty-column text screen, which the user
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0000- 16 ; controls with the mouse.
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0000- 17 ; The program has three main parts: mouseon,
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0000- 18 ; mouseoff, and Irqhndl. mouseon installs the
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0000- 19 ; interrupt handler’s entry address in the
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0000- 20 ; interrupt vector table in the ProDOS System
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0000- 21 ; Global Page; and then enables the mouse’s
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0000- 22 ; movement interrupts. mouseoff will deallocate
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0000- 23 ; the interrupt and disable the mouse. Irqhndl
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0000- 24 ; is the interrupt request handler. It’s
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0000- 25 ; address is the one installed in the Global
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0000- 26 ; Page, and it gets control at each interrupt.
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0000- 27 ;
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0000- 28
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0000- 29 ; page $00 locations
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00FA- 30 bas .eq $FA ; text screen base address ($FA-$FB)
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0008- 31 oldbas .eq $08 ; old text screen base address ($08-$09)
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00FE- 32 row .eq $FE ; storage for row
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00FF- 33 col .eq $FF ; storage for column
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0000- 34
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0000- 35 ; screen hole locations
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0478- 36 minl .eq $0478 ; Clamping minimum to set (low)
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0578- 37 minh .eq $0578 ; Clamping minimum to set (high)
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04F8- 38 maxl .eq $04F8 ; Clamping maximum to set (low)
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05F8- 39 maxh .eq $05F8 ; Clamping maximum to set (high)
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047C- 40 mouxl .eq $047C ; X coordinate (low)
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057C- 41 mouxh .eq $057C ; X coordinate (high)
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04FC- 42 mouyl .eq $04FC ; Y coordinate (low)
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05FC- 43 mouyh .eq $05FC ; Y coordinate (high)
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077C- 44 moustat .eq $077C ; Mouse status byte:
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0000- 45 ; bit meaning
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0000- 46 ; x....... button down
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0000- 47 ; .x...... button down still
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0000- 48 ; ..x..... movement since last read
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0000- 49 ; ...x.... (reserved)
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0000- 50 ; ....x... VBL interrupt has occurred
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0000- 51 ; .....x.. button interrupt has occurred
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0000- 52 ; ......x. movement interrupt has occurred
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0000- 53 ; .......x (reserved)
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0000- 54
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0000- 55 ; ProDOS global page
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BF00- 56 mli .eq $BF00 ; Machine Language Interface entry
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0040- 57 alloc_int .eq $40
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0041- 58 dealloc_int .eq $41
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0000- 59
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0000- 60 ; I/O ROM locations
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C01C- 61 page2sw .eq $C01C ; page two switch
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C054- 62 page1 .eq $C054 ; off: page1 (or main memory)
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C055- 63 page2 .eq $C055 ; on : page2 (or auxiliary memory)
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0000- 64
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0000- 65 ; slot ROM locations
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C412- 66 mtable .eq $C412 ; Start of mouse ROM table
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0000- 67 setm .eq $00 ; Set up mouse mode
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0001- 68 servem .eq $01 ; Set up carry flag and MOUSTAT
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0004- 69 posm .eq $04 ; Set mouse to X and Y coodinates
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0005- 70 clampm .eq $05 ; Set clamping boundaries:
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0007- 71 initm .eq $07 ; Set default values
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0000- 72
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9700- 73 .or $9700
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9700-4C 14 97 74 jmp mouseon ; turn on the mouse
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9703-4C 84 97 75 jmp mouseoff ; turn off the mouse
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9706- 76
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9706-42 77 cursor .db $42 ; mouse cursor
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9707- 78
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9707- 79 parms ; parameter list for MLI calls
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9707-02 80 .db 2
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9708-00 81 .db $00
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9709-04 98 82 .dw irqhndl
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970B- 83
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970B-00 C4 84 mouse .dw $C400 ; address of mouse routine
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970D-00 85 mouxls .db $00 ; storage for X coordinate (low)
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970E-00 86 mouxhs .db $00 ; storage for X coordinate (high)
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970F-00 87 mouyls .db $00 ; storage for Y coordinate (low)
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9710-00 88 moustats .db $00 ; storage for mouse status
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9711-00 89 oldchr .db $00 ; old character value
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9712-00 90 oldp2s .db $00 ; old page two switch setting
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9713-00 91 oldy .db $00 ; old Y register value
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9714- 92
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9714- 93 mouseon ; turn on the mouse
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9714-A9 02 94 lda #2 ; allocate interrupt
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9716-8D 07 97 95 sta parms
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9719-20 00 BF 96 jsr mli
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971C-40 97 .db alloc_int
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971D-07 97 98 .dw parms
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971F-A2 07 99 ldx #initm ; set default values
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9721-20 D0 97 100 jsr mouser
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9724-A9 3C 101 lda #$3C ; set clamping boundaries for X
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9726-8D F8 04 102 sta maxl
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9729-A9 01 103 lda #$01
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972B-8D F8 05 104 sta maxh
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972E-A9 00 105 lda #$00
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9730-8D 78 04 106 sta minl
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9733-8D 78 05 107 sta minh
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9736-A2 05 108 ldx #clampm
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9738-20 D0 97 109 jsr mouser
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973B-A9 B8 110 lda #$B8 ; set clamping boundaries for Y
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973D-8D F8 04 111 sta maxl
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9740-A9 00 112 lda #$00
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9742-8D F8 05 113 sta maxh
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9745-A9 01 114 lda #$01
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9747-A2 05 115 ldx #clampm
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9749-20 D0 97 116 jsr mouser
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974C-A9 03 117 lda #$03 ; set mouse to movement mode
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974E-A2 00 118 ldx #setm
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9750-20 D0 97 119 jsr mouser
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9753-A5 FE 120 lda row ; set X and Y coordinates
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9755-0A 121 asl
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9756-0A 122 asl
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9757-0A 123 asl
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9758-8D FC 04 124 sta mouyl
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975B-A9 00 125 lda #$00
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975D-8D FC 05 126 sta mouyh
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9760-A5 FF 127 lda col
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9762-0A 128 asl
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9763-0A 129 asl
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9764-8D 7C 04 130 sta mouxl
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9767-A9 00 131 lda #$00
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9769-2A 132 rol
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976A-8D 7C 05 133 sta mouxh
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976D-A2 04 134 ldx #posm
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976F-20 D0 97 135 jsr mouser
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9772-2C 1C C0 136 bit page2sw ; store page2
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9775-08 137 php
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9776-20 55 98 138 jsr newcur ; output new cursor and restore and save values
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9779-8D 54 C0 139 sta page1 ; restore page2
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977C-28 140 plp
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977D-10 03 141 bpl exint
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977F-8D 55 C0 142 sta page2
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9782-58 143 exint cli ; enable interrupts
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9783-60 144 rts
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9784- 145
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9784- 146 mouseoff ; turn off the mouse
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9784-A9 00 147 lda #$00 ; set mouse to off mode
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9786-A2 00 148 ldx #setm
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9788-20 D0 97 149 jsr mouser
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978B-2C 1C C0 150 bit page2sw ; store page2
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978E-08 151 php
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978F-8D 54 C0 152 sta page1 ; remove cursor
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9792-2C 12 97 153 bit oldp2s
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9795-10 03 154 bpl l7
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9797-8D 55 C0 155 sta page2
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979A-AC 13 97 156 l7 ldy oldy
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979D-AD 11 97 157 lda oldchr
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97A0-91 08 158 sta (oldbas),y
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97A2-8D 54 C0 159 sta page1 ; restore page2
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97A5-28 160 plp
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97A6-10 03 161 bpl l9
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97A8-8D 55 C0 162 sta page2
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97AB-AD 0F 97 163 l9 lda mouyls ; calculate ROW
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97AE-4A 164 lsr
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97AF-4A 165 lsr
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97B0-4A 166 lsr
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97B1-85 FE 167 sta row
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97B3-4E 0E 97 168 lsr mouxhs ; calculate COL
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97B6-6E 0D 97 169 ror mouxls
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97B9-4E 0E 97 170 lsr mouxhs
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97BC-6E 0D 97 171 ror mouxls
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97BF-AD 0D 97 172 lda mouxls
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97C2-85 FF 173 sta col
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97C4-A9 01 174 lda #1
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97C6-8D 07 97 175 sta parms
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97C9-20 00 BF 176 jsr mli ; deallocate interrupt
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97CC-41 177 .db dealloc_int
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97CD-07 97 178 .dw parms
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97CF-60 179 rts
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97D0- 180
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97D0-48 181 mouser pha
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97D1-BD 12 C4 182 lda mtable,x
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97D4-8D 0B 97 183 sta mouse
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97D7-68 184 pla
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97D8-08 185 php
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97D9-78 186 sei
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97DA-20 FD 97 187 jsr domsub
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97DD-6E 0B 97 188 ror mouse
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97E0-AD 7C 04 189 lda mouxl
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97E3-8D 0D 97 190 sta mouxls
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97E6-AD 7C 05 191 lda mouxh
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97E9-8D 0E 97 192 sta mouxhs
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97EC-AD FC 04 193 lda mouyl
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97EF-8D 0F 97 194 sta mouyls
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97F2-AD 7C 07 195 lda moustat
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97F5-8D 10 97 196 sta moustats
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97F8-28 197 plp
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97F9-0E 0B 97 198 asl mouse
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97FC-60 199 rts
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97FD-A2 C4 200 domsub ldx #$C4
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97FF-A0 40 201 ldy #$40
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9801-6C 0B 97 202 jmp (mouse)
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9804- 203
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9804- 204 irqhndl ; interrupt handler
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9804-D8 205 cld ;
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9805-A2 01 206 ldx #servem ;
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9807-20 D0 97 207 jsr mouser ; service mouse interrupt
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980A-B0 19 208 bcs erirq ; if not mouse interrupt then exit
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980C-AD 10 97 209 lda moustats ; get mouse status
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980F-4A 210 lsr ; put movement bit
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9810-4A 211 lsr ; in carry
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9811-90 12 212 bcc erirq ; if no movement then exit
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9813-2C 1C C0 213 bit page2sw ; store page2
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9816-08 214 php
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9817-20 27 98 215 jsr mvehndl ; handle movement
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981A-8D 54 C0 216 sta page1 ; restore page2
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981D-28 217 plp
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981E-10 03 218 bpl exirq
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9820-8D 55 C0 219 sta page2
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9823-18 220 exirq clc
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9824-89 221 .db $89 ; bit absorbs sec
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9825-38 222 erirq sec
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9826-60 223 rts
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9827- 224
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9827- 225 mvehndl ; movement handler
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9827-8D 54 C0 226 sta page1 ; remove old cursor
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982A-A9 80 227 lda #$80
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982C-2C 12 97 228 bit oldp2s
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982F-10 03 229 bpl l1
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9831-8D 55 C0 230 sta page2
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9834-AC 13 97 231 l1 ldy oldy
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9837-AD 11 97 232 lda oldchr
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983A-91 08 233 sta (oldbas),y
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983C-AD 0F 97 234 lda mouyls ; calculate ROW
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983F-4A 235 lsr
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9840-4A 236 lsr
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9841-4A 237 lsr
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9842-85 FE 238 sta row
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9844-4E 0E 97 239 lsr mouxhs ; calculate COL
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9847-6E 0D 97 240 ror mouxls
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984A-4E 0E 97 241 lsr mouxhs
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984D-6E 0D 97 242 ror mouxls
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9850-AD 0D 97 243 lda mouxls
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9853-85 FF 244 sta col
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9855-A5 FE 245 newcur lda row ; calculate base address
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9857-20 82 98 246 jsr bascalc
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985A-8D 54 C0 247 sta page1 ; choose main/aux memory
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985D-A5 FF 248 lda col
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985F-4A 249 lsr
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9860-B0 03 250 bcs l3
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9862-8D 55 C0 251 sta page2
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9865-A8 252 l3 tay ; output cursor and save old values
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9866-8C 13 97 253 sty oldy
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9869-B1 FA 254 lda (bas),y
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986B-8D 11 97 255 sta oldchr
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986E-AD 06 97 256 lda cursor
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9871-91 FA 257 sta (bas),y
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9873-AD 1C C0 258 lda page2sw
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9876-8D 12 97 259 sta oldp2s
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9879-A5 FA 260 lda bas
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987B-85 08 261 sta oldbas
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987D-A5 FB 262 lda bas+1
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987F-85 09 263 sta oldbas+1
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9881-60 264 rts
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9882- 265
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9882-48 266 bascalc pha ; text screen base address calculator (ROM)
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9883-4A 267 lsr
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9884-29 03 268 and #3
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9886-09 04 269 ora #4
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9888-85 FB 270 sta bas+1
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988A-68 271 pla
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988B-29 18 272 and #$18
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988D-90 02 273 bcc bcs1
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988F-69 7F 274 adc #$7F
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9891-85 FA 275 bcs1 sta bas
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9893-0A 276 asl
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9894-0A 277 asl
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9895-05 FA 278 ora bas
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9897-85 FA 279 sta bas
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9899-60 280 rts
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