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"
19 ; ------------------------------------------------------------------------
20 ; Header. Includes jump table
22 module_header _c128_ptvjoy_joy
26 .byte $6A, $6F, $79 ; "joy"
27 .byte JOY_API_VERSION ; Driver API version number
39 .addr 0 ; IRQ entry unused
41 ; ------------------------------------------------------------------------
44 JOY_COUNT = 4 ; Number of joysticks we support
49 ; ------------------------------------------------------------------------
50 ; INSTALL routine. Is called after the driver is loaded into memory. If
51 ; possible, check if the hardware is present and determine the amount of
53 ; Must return an JOY_ERR_xx code in a/x.
59 ; rts ; Run into UNINSTALL instead
61 ; ------------------------------------------------------------------------
62 ; UNINSTALL routine. Is called before the driver is removed from memory.
63 ; Can do cleanup or whatever. Must not return anything.
70 ; ------------------------------------------------------------------------
71 ; COUNT: Return the total number of available joysticks in a/x.
79 ; ------------------------------------------------------------------------
80 ; READ: Read a particular joystick passed in A.
83 READ: tax ; Joystick number into X
116 lda #%10000000 ; cia 2 port B Data-Direction
117 sta CIA2_DDRB ; bit 7: out bit 6-0: in
122 lda #$80 ; cia 2 port B read/write
123 sta CIA2_PRB ; (output one at PB7)
125 lda CIA2_PRB ; cia 2 port B read/write
126 and #$1f ; get bit 4-0 (PB4-PB0)
133 lda #$00 ; cia 2 port B read/write
134 sta CIA2_PRB ; (output zero at PB7)
136 lda CIA2_PRB ; cia 2 port B read/write
137 and #$0f ; get bit 3-0 (PB3-PB0)
138 sta tmp1 ; joy 4 directions
140 lda CIA2_PRB ; cia 2 port B read/write
141 and #%00100000 ; get bit 5 (PB5)