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 $00 ; Driver API version number
28 ; Button state masks (8 values)
35 .byte $00 ; Future expansion
36 .byte $00 ; Future expansion
37 .byte $00 ; Future expansion
46 ; ------------------------------------------------------------------------
49 JOY_COUNT = 4 ; Number of joysticks we support
52 ; ------------------------------------------------------------------------
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.
69 ; rts ; Run into DEINSTALL instead
71 ; ------------------------------------------------------------------------
72 ; UNINSTALL routine. Is called before the driver is removed from memory.
73 ; Can do cleanup or whatever. Must not return anything.
80 ; ------------------------------------------------------------------------
81 ; COUNT: Return the total number of available joysticks in a/x.
89 ; ------------------------------------------------------------------------
90 ; READ: Read a particular joystick passed in A.
94 and #3 ; fix joystick number
95 tax ; Joystick number (0-3) into X
99 lda STRIG0,x ; get button
104 ora STICK0,x ; add position information