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35377b5807
commit ed00e1d1b5a9783a72dade3f3676b161a9cfe287
Author: Curtis F Kaylor <revcurtis@gmail.com>
Date: Sun Sep 9 22:20:49 2018 -0400
Documented joystk, paddle, and lgtpen modules
commit ec0a5ede8d1b043fcf0094ea653255a808dbf8d3
Author: Curtis F Kaylor <revcurtis@gmail.com>
Date: Sun Sep 9 20:31:11 2018 -0400
Added joystick, paddle, and lightpen test programs
commit 7b787f432e2f4f7ae5d7f0053ade1d3586a4fad1
Author: Curtis F Kaylor <revcurtis@gmail.com>
Date: Sun Sep 9 20:30:03 2018 -0400
Updated Apple II and VIC-20 Batch Files
commit 50568294349d7e3c6b7d0d364aeaece73c9e4ab6
Author: Curtis F Kaylor <revcurtis@gmail.com>
Date: Sun Sep 9 20:28:09 2018 -0400
Separated light pen code into separate files
commit d45e59f73d55eef1d30c591d19a043ad79cfd81a
Author: Curtis F Kaylor <revcurtis@gmail.com>
Date: Sun Sep 9 19:28:56 2018 -0400
Moved code for paddles into separate include files
commit fc5c5472d758c960332ea14105d5ec4a7c8cbbfb
Author: Curtis F Kaylor <revcurtis@gmail.com>
Date: Sun Sep 9 16:15:32 2018 -0400
Added system specific module 'joystk'
26 lines
831 B
Plaintext
26 lines
831 B
Plaintext
;Paddle Controller Constants and Functions for Apple II
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PADDLS EQU #4 ;Maximum Numbers of Paddles
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;Read Paddle
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PADDLE: LDY #0 ;Set Result to 0
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CMP #PADDLS ;If Paddle# >= Max
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BCS PADDLZ ; Return # of Paddles & Carry Set
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TAX ;Copy Paddle# to X Register
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JSR $FB1E ;Execute Monitor PREAD Routine
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PADDLZ: TYA ;Copy Result to Accumulator
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RTS
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BUTTNS EQU #2 ;Maximum Numbers of Buttons
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;Read Paddle Button
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BUTTON: LDY #0 ;Set Result to 0
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CMP #BUTTNS ;If Button# >= Max
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BCS BUTTOZ ; Return Zero & Carry Set
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TAX ;Copy Paddle# to X Register
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LDA $C061,X ;Load Button Register
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BPL BUTTOZ ;If Bit 7 Set
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DEY ; Change Result to $FF
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BUTTOZ: TYA ;Copy Result to Accumulator
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RTS
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