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
27 ; Button state masks (8 values)
34 .byte $00 ; JOY_FIRE2 unavailable
35 .byte $00 ; Future expansion
36 .byte $00 ; Future expansion
44 .addr 0 ; IRQ entry unused
46 ; ------------------------------------------------------------------------
49 JOY_COUNT = 4 ; Number of joysticks we support
54 ; ------------------------------------------------------------------------
55 ; INSTALL routine. Is called after the driver is loaded into memory. If
56 ; possible, check if the hardware is present and determine the amount of
58 ; Must return an JOY_ERR_xx code in a/x.
64 ; rts ; Run into UNINSTALL instead
66 ; ------------------------------------------------------------------------
67 ; UNINSTALL routine. Is called before the driver is removed from memory.
68 ; Can do cleanup or whatever. Must not return anything.
75 ; ------------------------------------------------------------------------
76 ; COUNT: Return the total number of available joysticks in a/x.
84 ; ------------------------------------------------------------------------
85 ; READ: Read a particular joystick passed in A.
88 READ: tax ; Joystick number into X
123 lda #%10000000 ; cia 2 port B Data-Direction
124 sta CIA2_DDRB ; bit 7: out bit 6-0: in
126 lda #$80 ; cia 2 port B read/write
127 sta CIA2_PRB ; (output one at PB7)
129 lda CIA2_PRB ; cia 2 port B read/write
130 and #$1f ; get bit 4-0 (PB4-PB0)
135 joy4: lda #%10000000 ; cia 2 port B Data-Direction
136 sta CIA2_DDRB ; bit 7: out bit 6-0: in
138 lda #$00 ; cia 2 port B read/write
139 sta CIA2_PRB ; (output zero at PB7)
141 lda CIA2_PRB ; cia 2 port B read/write
142 and #$0f ; get bit 3-0 (PB3-PB0)
143 sta tmp1 ; joy 4 directions
145 lda CIA2_PRB ; cia 2 port B read/write
146 and #%00100000 ; get bit 5 (PB5)