mirror of
https://github.com/RevCurtisP/C02.git
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114 lines
3.2 KiB
Plaintext
114 lines
3.2 KiB
Plaintext
;run6502 program initialization code for c02 programs
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;System Specific ASCII Key Mappings
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DELKEY EQU $08 ;Delete/Backspace Key (Backspace)
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ESCKEY EQU $1B ;Escape/Stop Key (Escape)
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RTNKEY EQU $0D ;Return/Enter Key (Carriage Return)
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;Zero Page Variables
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; $00-$06 ;Reserved
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XMBANK EQU $07 ;Extended Memory Bank
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XMADDR EQU $08 ;Extended Memory Address
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SRCPTR EQU $10 ;Source Pointer
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DSTPTR EQU $12 ;Destination Pointer
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TEMP0 EQU $14 ;Temporary Storage
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TEMP1 EQU $15
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TEMP2 EQU $16
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TEMP3 EQU $17
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TMPPTR EQU $18 ;Temporary Pointer
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LSTPTR EQU $1A ;List Pointer
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USRPTR EQU $1C ;User Pointer
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; $1E ;Reserved
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BLKLEN EQU $1F ;Block Segment Length
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BLKPTR EQU $20 ;Block Segment Pointer
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BLKBGN EQU $22 ;Block Start Address
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BLKEND EQU $24 ;Block End Address
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STKPTR EQU $26 ;Stack Pointer
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STKBGN EQU $28 ;Stack Start Addres
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STKEND EQU $2A ;Stack End Address
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RDSEED EQU $2C ;Pseudo-RANDOM Seed
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RANDOM EQU $2D ;Pseudo-RANDOM Number Storage
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SYSBFP EQU $2E ;Position in System Buffer
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.STKSAV EQU $2F ;Stack Pointer Storage
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INTACC EQU $30 ;Integer Accumulator
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INTOVR EQU $32 ;Integer Overflow
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INTARG EQU $34 ;Integer Argument
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; $34-$3F ;Reserved
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; $40-$FF ;Free Zero Page for Applications
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SYSBFL EQU 128 ;System Buffer Size (Max String Size)
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SYSBFR EQU $0200 ;System Buffer
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; $0281-$03FF ;Unused
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;Emulated BIOS System Calls
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.GETCH EQU $FFE0 ;-K Read Keyboard
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.PUTCH EQU $FFE3 ;-C Write to Screen
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FSCMD EQU $FFE6 ;-F filecmd() - File I/O Command Processor
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SYSCMD EQU $FFE9 ;-S syscmd() - System Command Processor
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XMCMD EQU $FFEC ;-E Extended Memory
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.STDIO EQU $FFEF ;-M Memory Mapped stdio
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EXIT EQU $FFF0 ;-X Exit Emulator
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; $0000 ;-N NMI Vector
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ARGV EQU $0300 ;Command Line Arguments Bu
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ORG $0400 ;START at RAM midpoint
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START: JMP MAIN ;Execute Program
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;Read Character from Console
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GETKEY EQU .GETCH ;Emulator _GETCH Routine
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;Poll Character from Keyboard
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POLKEY: BRK ;Exit Emulator
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;Wait for Character from Console
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GETCHR: JSR GETKEY ;Get Key from Console
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BEQ GETCHR ;If None Pressed, Loop
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RTS
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;Read Character from stdin
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RDCHAR: LDA .STDIO ;Read Character from STDIN
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CMP #$FF ;If EOF
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BNE RDCHAX
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LDA #0 ; Set to ASCII NUL
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RDCHAX ORA #0 ;Set Flags
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RTS
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;Delete Previous Character
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DELCHR: LDA #$08 ;Load Backspace into Accumulator
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JSR PUTCHR ; and Print it
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LDA #$20 ;Load Space into Accumulator
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JSR PUTCHR ; and Print it
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LDA #$08 ;Load Backspace into Accumulator
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JMP PUTCHR ; and Print it
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;Advance Character to Next line
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NEWLIN: LDA #$0D ;Load Carriage Return into Accumulator
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JSR PUTCHR ; and Print it
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LDA #$0A ;Load Line Feed into Accumulator
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JMP PUTCHR ; and Print it
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;Print Character to Console
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PUTCHR EQU .PUTCH ;Emulator CHROUT Routine
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;Write Character to stdout
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PRCHAR: STA .STDIO ;Read Character from STDIN
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RTS
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INCLUDE "prbyte.a02" ;PRBYTE and PRHEX routines
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INCLUDE "putstr.a02" ;PUTSTR routine
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