2 ; PTV-4 Player joystick driver for the C64
4 ; Groepaz/Hitmen, 2002-12-23
5 ; obviously based on Ullrichs driver :)
8 .include "zeropage.inc"
10 .include "joy-kernel.inc"
11 .include "joy-error.inc"
16 ; ------------------------------------------------------------------------
17 ; Header. Includes jump table
23 .byte $6A, $6F, $79 ; "joy"
24 .byte JOY_API_VERSION ; Driver API version number
30 ; Button state masks (8 values)
37 .byte $00 ; JOY_FIRE2 unavailable
38 .byte $00 ; Future expansion
39 .byte $00 ; Future expansion
47 .addr 0 ; IRQ entry unused
49 ; ------------------------------------------------------------------------
52 JOY_COUNT = 4 ; Number of joysticks we support
57 ; ------------------------------------------------------------------------
58 ; INSTALL routine. Is called after the driver is loaded into memory. If
59 ; possible, check if the hardware is present and determine the amount of
61 ; Must return an JOY_ERR_xx code in a/x.
67 ; rts ; Run into UNINSTALL instead
69 ; ------------------------------------------------------------------------
70 ; UNINSTALL routine. Is called before the driver is removed from memory.
71 ; Can do cleanup or whatever. Must not return anything.
78 ; ------------------------------------------------------------------------
79 ; COUNT: Return the total number of available joysticks in a/x.
87 ; ------------------------------------------------------------------------
88 ; READ: Read a particular joystick passed in A.
91 READ: tax ; Joystick number into X
124 lda #%10000000 ; cia 2 port B Data-Direction
125 sta CIA2_DDRB ; bit 7: out bit 6-0: in
130 lda #$80 ; cia 2 port B read/write
131 sta CIA2_PRB ; (output one at PB7)
133 lda CIA2_PRB ; cia 2 port B read/write
134 and #$1f ; get bit 4-0 (PB4-PB0)
140 joy4: lda #$00 ; cia 2 port B read/write
141 sta CIA2_PRB ; (output zero at PB7)
143 lda CIA2_PRB ; cia 2 port B read/write
144 and #$0f ; get bit 3-0 (PB3-PB0)
145 sta tmp1 ; joy 4 directions
147 lda CIA2_PRB ; cia 2 port B read/write
148 and #%00100000 ; get bit 5 (PB5)