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
30 ; Button state masks (8 values)
36 .byte $01 ; JOY_FIRE (A)
37 .byte $02 ; JOY_FIRE2 (B)
47 .addr 0 ; IRQ entry unused
49 ; ------------------------------------------------------------------------
52 JOY_COUNT = 2 ; Number of joysticks we support
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 ; ------------------------------------------------------------------------
88 ; READ: Read a particular joystick passed in A.
92 and #$01 ; Fix joystick number
93 tay ; Joystick number (0,1) into Y
103 @Loop: lda APU_PAD1,y
110 ; ldx #$00 ; X implicitly fixed