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
43 .addr 0 ; IRQ entry not used
45 ; ------------------------------------------------------------------------
48 JOY_COUNT = 4 ; Number of joysticks we support
51 ; ------------------------------------------------------------------------
57 ; ------------------------------------------------------------------------
58 ; INSTALL routine. Is called after the driver is loaded into memory. If
59 ; possible, check if the hardware is present and determine the amount of
61 ; Must return an JOY_ERR_xx code in a/x.
67 ; rts ; Run into UNINSTALL instead
69 ; ------------------------------------------------------------------------
70 ; UNINSTALL routine. Is called before the driver is removed from memory.
71 ; Can do cleanup or whatever. Must not return anything.
78 ; ------------------------------------------------------------------------
79 ; COUNT: Return the total number of available joysticks in a/x.
87 lsr a ; XL and newer machines only have 2 ports
92 ; ------------------------------------------------------------------------
93 ; READ: Read a particular joystick passed in A.
97 and #3 ; fix joystick number
98 tax ; Joystick number (0-3) into X
102 lda STRIG0,x ; get button
107 ora STICK0,x ; add position information