2 ; Standard joypad driver for the NES. May be used multiple times when
3 ; linked to the statically application.
5 ; Ullrich von Bassewitz, 2003-05-02
6 ; Stefan Haubenthal, 2004-10-05
9 .include "zeropage.inc"
11 .include "joy-kernel.inc"
12 .include "joy-error.inc"
16 ; ------------------------------------------------------------------------
17 ; Header. Includes jump table
23 .byte $6A, $6F, $79 ; "joy"
24 .byte JOY_API_VERSION ; Driver API version number
26 ; Button state masks (8 values)
32 .byte $01 ; JOY_FIRE (A)
33 .byte $02 ; JOY_FIRE2 (B)
43 .addr 0 ; IRQ entry unused
45 ; ------------------------------------------------------------------------
48 JOY_COUNT = 2 ; Number of joysticks we support
53 ; ------------------------------------------------------------------------
54 ; INSTALL routine. Is called after the driver is loaded into memory. If
55 ; possible, check if the hardware is present and determine the amount of
57 ; Must return an JOY_ERR_xx code in a/x.
63 ; rts ; Run into UNINSTALL instead
65 ; ------------------------------------------------------------------------
66 ; UNINSTALL routine. Is called before the driver is removed from memory.
67 ; Can do cleanup or whatever. Must not return anything.
74 ; ------------------------------------------------------------------------
75 ; COUNT: Return the total number of available joysticks in a/x.
83 ; ------------------------------------------------------------------------
84 ; READ: Read a particular joystick passed in A.
88 and #$01 ; Fix joystick number
89 tay ; Joystick number (0,1) into Y
106 ; ldx #$00 ; X implicitly fixed