apple2js/asm/mouse.s

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ArmAsm
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2021-12-29 23:00:44 +00:00
;
; Minimal mouse support. Only firmware routines are supported, no
; I/O hooks or softswitches. This is enough to work with titles
; that follow the documentation's recommendations to use the
; firmware routines like Dazzle Draw and Apple II DeskTop
;
ORG $C700
; Constants for future reference
CLAMP_X_LOW EQU $478
CLAMP_Y_LOW EQU $4F8
CLAMP_X_HIGH EQU $578
CLAMP_Y_HIGH EQU $5F8
X_LOW EQU $478
Y_LOW EQU $4F8
X_HIGH EQU $578
Y_HIGH EQU $5F8
RESERVED1 EQU $678
RESERVED2 EQU $67F
STATUS EQU $778
MODE EQU $7F8
STATUS_DOWN EQU $80
STATUS_LAST EQU $40
INT_SCREEN EQU $08
INT_BUTTON EQU $04
INT_MOUSE EQU $02
ROMRTS EQU $FF58
DFB $00 ; $00
DFB $00 ; $01
DFB $00 ; $02
DFB $00 ; $03
DFB $00 ; $04
; Cx05 - Pascal ID byte
DFB $38 ; $05
DFB $00 ; $06
; Cx07 - Pascal ID byte
DFB $18 ; $07
DFB $00 ; $08
DFB $00 ; $09
DFB $00 ; $0A
; Cx0B - Generic signature byte of firmware cards
DFB $01 ; $0B
; Cx0C - 2 = X-Y pointing device; 0 = identification code
ID1 DFB $20 ; $0C
DFB $00 ; $0D
DFB $00 ; $0E
DFB $00 ; $0F
DFB $00 ; $10
DFB $00 ; $11
; The firmware routines point to individual RTS opcodes
; that are intercepted by the card implementation which
; manipulates memory and processor state directly
DFB $20 ; $12 SETMOUSE
DFB $21 ; $13 SERVEMOUSE
DFB $22 ; $14 READMOUSE
DFB $23 ; $15 CLEARMOUSE
DFB $24 ; $16 POSMOUSE
DFB $25 ; $17 CLAMPMOUSE
DFB $26 ; $18 HOMEMOUSE
DFB $27 ; $19 INITMOUSE
DFB $00 ; $1A
DFB $00 ; $1B
DFB $00 ; $1C
DFB $00 ; $1D
DFB $00 ; $1E
DFB $00 ; $1F
RTS ; $20 SETMOUSE
RTS ; $21 SERVEMOUSE
RTS ; $22 READMOUSE
RTS ; $23 CLEARMOUSE
RTS ; $24 POSMOUSE
RTS ; $25 CLAMPMOUSE
RTS ; $26 HOMEMOUSE
RTS ; $27 INITMOUSE
PADDING DS $C7FB - PADDING
ORG $C7FB
; CxFB - A mouse identification byte
ID2 DFB $D6 ; $FB
DFB $00 ; $FC
DFB $00 ; $FD
DFB $00 ; $FE
DFB $00 ; $FF
END