2 ; Standard joystick driver for the Atari. May be used multiple times when linked
3 ; to the statically application.
5 ; Ullrich von Bassewitz, 2002-12-21
6 ; Using the readjoy code from Christian Groessler
9 .include "zeropage.inc"
11 .include "joy-kernel.inc"
12 .include "joy-error.inc"
19 ; ------------------------------------------------------------------------
20 ; Header. Includes jump table
23 module_header _atrxstd_joy
25 module_header _atrstd_joy
30 .byte $6A, $6F, $79 ; "joy"
31 .byte JOY_API_VERSION ; Driver API version number
37 ; Button state masks (8 values)
44 .byte $00 ; JOY_FIRE2 not available
45 .byte $00 ; Future expansion
46 .byte $00 ; Future expansion
54 .addr 0 ; IRQ entry not used
56 ; ------------------------------------------------------------------------
59 JOY_COUNT = 4 ; Number of joysticks we support
62 ; ------------------------------------------------------------------------
68 ; ------------------------------------------------------------------------
69 ; INSTALL routine. Is called after the driver is loaded into memory. If
70 ; possible, check if the hardware is present and determine the amount of
72 ; Must return an JOY_ERR_xx code in a/x.
78 ; rts ; Run into UNINSTALL instead
80 ; ------------------------------------------------------------------------
81 ; UNINSTALL routine. Is called before the driver is removed from memory.
82 ; Can do cleanup or whatever. Must not return anything.
89 ; ------------------------------------------------------------------------
90 ; COUNT: Return the total number of available joysticks in a/x.
98 lsr a ; XL and newer machines only have 2 ports
103 ; ------------------------------------------------------------------------
104 ; READ: Read a particular joystick passed in A.
108 and #3 ; fix joystick number
109 tax ; Joystick number (0-3) into X
113 lda STRIG0,x ; get button
118 ora STICK0,x ; add position information