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"
18 ; ------------------------------------------------------------------------
19 ; Header. Includes jump table
21 module_header _nes_stdjoy_joy
25 .byte $6A, $6F, $79 ; "joy"
26 .byte JOY_API_VERSION ; Driver API version number
32 ; Button state masks (8 values)
38 .byte $01 ; JOY_FIRE (A)
39 .byte $02 ; JOY_FIRE2 (B)
49 .addr 0 ; IRQ entry unused
51 ; ------------------------------------------------------------------------
54 JOY_COUNT = 2 ; Number of joysticks we support
59 ; ------------------------------------------------------------------------
60 ; INSTALL routine. Is called after the driver is loaded into memory. If
61 ; possible, check if the hardware is present and determine the amount of
63 ; Must return an JOY_ERR_xx code in a/x.
69 ; rts ; Run into UNINSTALL 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 #$01 ; Fix joystick number
95 tay ; Joystick number (0,1) into Y
105 @Loop: lda APU_PAD1,y
112 ; ldx #$00 ; X implicitly fixed