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"
18 ; ------------------------------------------------------------------------
19 ; Header. Includes jump table
21 module_header _c64_ptvjoy_joy
25 .byte $6A, $6F, $79 ; "joy"
26 .byte JOY_API_VERSION ; Driver API version number
32 ; Button state masks (8 values)
39 .byte $00 ; JOY_FIRE2 unavailable
40 .byte $00 ; Future expansion
41 .byte $00 ; Future expansion
49 .addr 0 ; IRQ entry unused
51 ; ------------------------------------------------------------------------
54 JOY_COUNT = 4 ; Number of joysticks we support
59 ; ------------------------------------------------------------------------
60 ; INSTALL routine. Is called after the driver is loaded into memory. If
61 ; possible, check if the hardware is present and determine the amount of
63 ; Must return an JOY_ERR_xx code in a/x.
69 ; rts ; Run into UNINSTALL instead
71 ; ------------------------------------------------------------------------
72 ; UNINSTALL routine. Is called before the driver is removed from memory.
73 ; Can do cleanup or whatever. Must not return anything.
80 ; ------------------------------------------------------------------------
81 ; COUNT: Return the total number of available joysticks in a/x.
89 ; ------------------------------------------------------------------------
90 ; READ: Read a particular joystick passed in A.
93 READ: tax ; Joystick number into X
126 lda #%10000000 ; cia 2 port B Data-Direction
127 sta CIA2_DDRB ; bit 7: out bit 6-0: in
132 lda #$80 ; cia 2 port B read/write
133 sta CIA2_PRB ; (output one at PB7)
135 lda CIA2_PRB ; cia 2 port B read/write
136 and #$1f ; get bit 4-0 (PB4-PB0)
142 joy4: lda #$00 ; cia 2 port B read/write
143 sta CIA2_PRB ; (output zero at PB7)
145 lda CIA2_PRB ; cia 2 port B read/write
146 and #$0f ; get bit 3-0 (PB3-PB0)
147 sta tmp1 ; joy 4 directions
149 lda CIA2_PRB ; cia 2 port B read/write
150 and #%00100000 ; get bit 5 (PB5)