2 ; PTV-4 Player joystick driver for the C128
4 ; Ullrich von Bassewitz, 2003-09-28, using the C64 driver from
5 ; Groepaz/Hitmen, 2002-12-23, which is
6 ; obviously based on Ullrichs driver :)
9 .include "zeropage.inc"
11 .include "joy-kernel.inc"
12 .include "joy-error.inc"
17 ; ------------------------------------------------------------------------
18 ; Header. Includes jump table
24 .byte $6A, $6F, $79 ; "joy"
25 .byte JOY_API_VERSION ; Driver API version number
31 ; Button state masks (8 values)
38 .byte $00 ; JOY_FIRE2 unavailable
39 .byte $00 ; Future expansion
40 .byte $00 ; Future expansion
48 .addr 0 ; IRQ entry unused
50 ; ------------------------------------------------------------------------
53 JOY_COUNT = 4 ; Number of joysticks we support
58 ; ------------------------------------------------------------------------
59 ; INSTALL routine. Is called after the driver is loaded into memory. If
60 ; possible, check if the hardware is present and determine the amount of
62 ; Must return an JOY_ERR_xx code in a/x.
68 ; rts ; Run into UNINSTALL instead
70 ; ------------------------------------------------------------------------
71 ; UNINSTALL routine. Is called before the driver is removed from memory.
72 ; Can do cleanup or whatever. Must not return anything.
79 ; ------------------------------------------------------------------------
80 ; COUNT: Return the total number of available joysticks in a/x.
88 ; ------------------------------------------------------------------------
89 ; READ: Read a particular joystick passed in A.
92 READ: tax ; Joystick number into X
125 lda #%10000000 ; cia 2 port B Data-Direction
126 sta CIA2_DDRB ; bit 7: out bit 6-0: in
131 lda #$80 ; cia 2 port B read/write
132 sta CIA2_PRB ; (output one at PB7)
134 lda CIA2_PRB ; cia 2 port B read/write
135 and #$1f ; get bit 4-0 (PB4-PB0)
142 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)