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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'
33 lines
1.2 KiB
Plaintext
33 lines
1.2 KiB
Plaintext
;Light Pen Constants and Functions
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;Non-Functional Skeleton for Systems with No Joystick Support
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LGTPNS EQU #$FF ;Light Pen Status (Supported)
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;Read Light Pen
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LGTPEN: LDX #0 ;Initialize X to FALSE (0)
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LDA $9009 ;Check Paddle 1 (Magnum Light Phaser)
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BMI LGTPEJ ;If Trigger Pulled
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DEX ; Set X to TRUE ($FF)
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BNE LGTPEP ;Else Check Joystick Inputs
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LGTPEJ: LDA $9113 ; Get DDR for Port A Status
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PHA ; and Save It
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LDA $9122 ; Set DDR for Port B Status
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PHA ; and Save It
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STX $9113 ; Set DDR for Port A to All Inputs
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STX $9122 ; Set DDR for Port B to All Inputs
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LDA $9120 ; Read Port B (S2)
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ASL ; Shift Bit 7 into Carry
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LDA $9111 ; Read Port A
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ROR ; Rotate Carry Back In
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EOR #$FF ; Invert Bits
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AND #$9E ; and Mask Joystick Inputs
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BEQ LGTPES ; If Any Bits Set
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DEX ; Set X to TRUE ($FF)
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LGTPES: PLA ; Restore Port B DDDR
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STA $9122
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PLA ; Restore Port A DDDR
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STA $9113
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LGTPEP: LDY $9007 ;Read Y Position into Y
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LDA $9006 ;Read X Position into A
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RTS
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