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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'
125 lines
4.2 KiB
Plaintext
125 lines
4.2 KiB
Plaintext
;c02 Program Initialization Code for Vic-20 - Common Code
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;PETSCII Key Mappings
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DELKEY EQU $14 ;Delete/Backspace Key (Delete)
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ESCKEY EQU $03 ;Escape/Stop Key (RUN/STOP)
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RTNKEY EQU $0D ;Return/Enter Key (RETURN)
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;Zero Page Locations
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SRCLO EQU $22 ;Source Pointer LSB [Temporary Pointers]
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SRCHI EQU $23 ;Source Pointer MSB [Temporary Pointers]
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DSTLO EQU $24 ;Destination Pointer LSB [Temporary Pointers]
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DSTHI EQU $25 ;Destination Pointer MSB [Temporary Pointers]
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BLKLO EQU $26 ;Block Pointer LSB [Floating Point Work Area]
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BLKHI EQU $27 ;Block Pointer MSB [Floating Point Work Area]
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STKLO EQU $28 ;Stack Pointer LSB [Floating Point Work Area]
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STKHI EQU $29 ;Stack Pointer MSB [Floating Point Work Area]
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RDSEED EQU $2A ;Random Seed [Software Jiffy Clock (Low Byte)]
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TEMP0 EQU $FB ;Temporary Variable [Unused Byte]
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TEMP1 EQU $FC ;Temporary Variable [Unused Byte]
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TEMP2 EQU $FD ;Temporary Variable [Unused Byte]
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TEMP3 EQU $FE ;Temporary Variable [Unused Byte]
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USER0 EQU $0310 ;Free Byte for User Programs
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RANDOM EQU $0311 ;Random Number Storage [Unused Byte]
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STKSAV EQU $0312 ;Machine Stack Storage [Unused Byte]
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STKSLO EQU $0313 ;Stack Start LSB [Unused Byte]
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STKSHI EQU $0334 ;Stack Start MSB [Unused Byte]
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STKELO EQU $0335 ;Stack End LSB [Unused Byte]
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STKEHI EQU $0336 ;Stack End MSB [Unused Byte]
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BLKSLO EQU $0337 ;Block Start LSB [Unused Byte]
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BLKSHI EQU $0338 ;Block Start MSB [Unused Byte]
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BLKELO EQU $0339 ;Block Start MSB [Unused Byte]
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BLKEHI EQU $033A ;Block End MSB [Unused Byte]
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BLKLEN EQU $033B ;Block Length [Unused Byte]
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TBFFR EQU $033C ;Cassette I/O Buffer
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USER12 EQU $03FC ;Free Byte for User Programs
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USER13 EQU $03FD ;Free Byte for User Programs
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USER14 EQU $03FE ;Free Byte for User Programs
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USER15 EQU $03FF ;Free Byte for User Programs
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START: TSX ;Get Stack Pointer
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STX STKSAV ;and Save for Exit
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JMP MAIN ;Execute Program
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EXIT: LDX STKSAV ;Retrieve Saved Stack Pointer
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TXS ;and Restore It
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RTS ;Return to BASIC
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;Poll Keyboard for Character
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POLKEY EQU $FFE4 ;Aliased to Kernal GETIN Routine
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;Get Character from Keyboard
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GETKEY: JSR POLKEY ;Get Key From Keybord
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;The below is not working...
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LDY $9005 ;Get Character Memory Offset
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CPY #242 ;If Upper/Lower
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BNE GETKEX
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BIT $FF ; Bit 7 -> C, Bit 6 -> V
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BVC GETKEX ; If Bit 6 Set (Alpha)
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BCC GETKEL ; If Bit 7 Set (PETSCII Upper)
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AND #$7F ; Clear Bit 7 (ASCII Upper)
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BNE GETKEX ; Else
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GETKEL: ORA #$20 ; Set Bit 5 (ASCII Lower)
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GETKEX: ORA #$00 ;Set Flags
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RTS
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;A = $41 %0100 0001
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;a = $C1 %1100 0001 PETSCII
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;a = $61 %0110 0001 PETSCII
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;$9005 = 240 UPR/GFX
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; 242 UPR/LWR
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;Wait for Character from Keyboard
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GETCHR: JSR GETKEY ;Poll Keyboard
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BEQ GETCHR ;If No Key, Loop
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RTS
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;Print Character to Console
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;uses direct call to SCRNOUT instead of CHROUT
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PUTCHR EQU $E742 ;Aliased to SRCNOUT Routine
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;Delete Previous Character
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DELCHR: LDA #DELKEY ;Load Delete Character
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JMP PUTCHR ;Print and Return
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;Advance Character to Next line
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NEWLIN: LDA #RTNKEY ;Load C/R into Accumulator
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JMP PUTCHR ;Print and Return
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;Clear the Screen
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CLRSCR EQU $E55F ;Alias to CLSR Routine
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;Move Cursor to Specified Coordinates
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SETPOS: STA $D3 ;Save Cursor Column
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STY $D6 ;Save Cursor Row
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JMP $E587 ;Set Screen Poiners and Return
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;Get Cursor Position
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GETPOS: LDY $D6 ;Load Cursor Row
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LDA $D3 ;Load Cursor Column
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RTS
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;Get Screen Size
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GETSIZ: JSR $FFED ;Call SCREEN Kernal Routine
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TXA ;Transfer Width to Accumulator
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RTS
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;Print Byte as Two-Digit Hex Number to Console
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PRBYTE: PHA ;Save Accumulater
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LSR ;Shift Hi Nybble to Low Nybble
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LSR
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LSR
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LSR
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JSR PRHEX ; and Print it
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PLA ;Restore Accumulator
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; and fall into prhex
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;Print Low Nybble as Hex Digit to Console
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PRHEX: AND #$0F ;Strip High Nybble
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CMP #$0A ;If Low Nybble >= 10
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BCC PRHEXC ;
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ADC #$06 ; Convert ':' to 'A'...
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PRHEXC: ADC #$30 ;Convert to ASCII Character
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JMP PUTCHR ;Print Hex Digit and Return
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