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"
18 ; ------------------------------------------------------------------------
19 ; Header. Includes jump table
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 not available
40 .byte $00 ; Future expansion
41 .byte $00 ; Future expansion
49 .addr 0 ; IRQ entry not used
51 ; ------------------------------------------------------------------------
54 JOY_COUNT = 4 ; Number of joysticks we support
57 ; ------------------------------------------------------------------------
63 ; ------------------------------------------------------------------------
64 ; INSTALL routine. Is called after the driver is loaded into memory. If
65 ; possible, check if the hardware is present and determine the amount of
67 ; Must return an JOY_ERR_xx code in a/x.
73 ; rts ; Run into UNINSTALL instead
75 ; ------------------------------------------------------------------------
76 ; UNINSTALL routine. Is called before the driver is removed from memory.
77 ; Can do cleanup or whatever. Must not return anything.
84 ; ------------------------------------------------------------------------
85 ; COUNT: Return the total number of available joysticks in a/x.
93 lsr a ; XL and newer machines only have 2 ports
98 ; ------------------------------------------------------------------------
99 ; READ: Read a particular joystick passed in A.
103 and #3 ; fix joystick number
104 tax ; Joystick number (0-3) into X
108 lda STRIG0,x ; get button
113 ora STICK0,x ; add position information