; ; Read PC joystick (game) port: int joystick(int results, 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 ;Address game port XOR CX,CX ;Zero initial count AND AX,#$0F00 ;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 ;AX bit set JNZ ?2 ;No, its not MOV [BX],CX ;Save position OR AH,#$01 ;Disable further AX ?2 TEST AL,#$02 ;AY bit set JNZ ?3 ;No, try next MOV 2[BX],CX ;Save position OR AH,#$02 ;Disable further AY ?3 TEST AL,#$04 ;BX bit set? JNZ ?4 ;No, try next MOV 4[BX],CX ;Save position OR AH,#$04 ;Disable further BX ?4 TEST AL,#$08 ;BY bit set? JNZ ?5 ;No, try next MOV 6[BX],CX ;Save position OR AH,#$08 ;Disable further BY ?5 INC CX ;Advance count JZ ?6 ;Overflow... CMP AH,#$0F ;All bits set? JNZ ?1 ;No, keep looking ?6 NOT AH ;Invert bits AND AL,AH ;Set flags XOR AH,AH ;Zero high RET
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