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31 lines
365 B
ArmAsm
31 lines
365 B
ArmAsm
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; Christian Groessler
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; unsigned readjoy (unsigned char joy);
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;
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.export _readjoy
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.include "atari.inc"
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.proc _readjoy
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and #3 ; fix joystick number
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tax ; Joystick number (0-3) into X
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; Read joystick
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lda STRIG0,x ; get button
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asl a
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asl a
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asl a
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asl a
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ora STICK0,x ; add position information
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eor #$1F
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ldx #0 ; fix X
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rts
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.endproc
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