Joystick.asm

;
; Read PC joystick (game) port: int joystick(int results[4], char flags)
; results = Integer array to receive the AX, AY, BX, and BY values
; flags = Bits 0,1,2,3 = Disable AX,AY,BX,BY (1 = Disable)
; Returns : Bits 0,1,2,3 = Error reading AX,AY,BX,BY (1 = Error)
; Bits 4,5,6,7 = Buttons A1,A2,B1,B2 (0 = Pressed)
;
; Values placed in 'results' will range from 0 to 'n', where 'n' is
; dependant on the speed of the hardware. Experiment with your system
; to determine the actual maximum values, and scale the results to
; the range of measurements you are taking.
;
; To add to DDS MICROC-C 8086 library: CD to LIB86 subdirectory, copy in
; this file, and issue the commands: (omit memory models you don't want)
; slib i=tiny a=joystick
; slib i=small a=joystick
;
; Copyright 1989-2000 Dave Dunfield
; All rights reserved.
;
; Permission granted for personal (non-commercial) use only.
;
joystick MOV BX,SP ;Address parms
 MOV AH,2[BX] ;Get mask flags
 MOV BX,4[BX] ;Get array address
 MOV DX,#0201ドル ;Address game port
 XOR CX,CX ;Zero initial count
 AND AX,#0ドルF00 ;Mask AH, AL=0
 OUT DX,AL ;Write to I/O port
?1 IN AL,DX ;Read I/O port
 OR AL,AH ;Mask already received ports
 TEST AL,#01ドル ;AX bit set
 JNZ ?2 ;No, its not
 MOV [BX],CX ;Save position
 OR AH,#01ドル ;Disable further AX
?2 TEST AL,#02ドル ;AY bit set
 JNZ ?3 ;No, try next
 MOV 2[BX],CX ;Save position
 OR AH,#02ドル ;Disable further AY
?3 TEST AL,#04ドル ;BX bit set?
 JNZ ?4 ;No, try next
 MOV 4[BX],CX ;Save position
 OR AH,#04ドル ;Disable further BX
?4 TEST AL,#08ドル ;BY bit set?
 JNZ ?5 ;No, try next
 MOV 6[BX],CX ;Save position
 OR AH,#08ドル ;Disable further BY
?5 INC CX ;Advance count
 JZ ?6 ;Overflow...
 CMP AH,#0ドルF ;All bits set?
 JNZ ?1 ;No, keep looking
?6 NOT AH ;Invert bits
 AND AL,AH ;Set flags
 XOR AH,AH ;Zero high
 RET
 file: /Techref/com/dunfield/ftp/embedpc/joystick_asm.htm, 5KB, , updated: 2002年11月1日 17:54, local time: 2025年9月3日 03:31, 

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