2020-04-27 15:50:22 +00:00
|
|
|
;run6502 program initialization code for c02 programs
|
|
|
|
|
|
|
|
|
|
;System Specific ASCII Key Mappings
|
|
|
|
|
DELKEY EQU $08 ;Delete/Backspace Key (Backspace)
|
2020-10-19 19:42:10 +00:00
|
|
|
ESCKEY EQU $1B ;Escape/Stop Key (Escape)
|
2020-10-16 02:58:12 +00:00
|
|
|
RTNKEY EQU $0D ;Return/Enter Key (Carriage Return)
|
2020-04-27 15:50:22 +00:00
|
|
|
|
|
|
|
|
;Zero Page Locations
|
2020-10-19 19:42:10 +00:00
|
|
|
SRCPTR EQU $30 ;Source String Pointer
|
|
|
|
|
DSTPTR EQU $32 ;Destination String Pointer
|
|
|
|
|
BLKPTR EQU $34 ;Block Segment Pointer
|
|
|
|
|
STKPTR EQU $36 ;Stack Pointer
|
|
|
|
|
USRPTR EQU $38 ;User Pointer
|
|
|
|
|
|
|
|
|
|
XMADDR EQU $3A ;Extended Memory Address
|
|
|
|
|
XMBANK EQU $3C ;Extended Memory Bank
|
|
|
|
|
; $3D ;Unused
|
2020-04-27 15:50:22 +00:00
|
|
|
|
|
|
|
|
RDSEED EQU $3E ;Pseudo-RANDOM Seed
|
|
|
|
|
RANDOM EQU $3F ;Pseudo-RANDOM Number Storage
|
|
|
|
|
|
|
|
|
|
TEMP0 EQU $40 ;Temporary Storage
|
|
|
|
|
TEMP1 EQU $41
|
|
|
|
|
TEMP2 EQU $42
|
|
|
|
|
TEMP3 EQU $43
|
2020-10-19 19:42:10 +00:00
|
|
|
TMPPTR EQU $44 ;Temporary Pointer
|
2020-04-27 15:50:22 +00:00
|
|
|
|
2020-10-16 02:58:12 +00:00
|
|
|
BLKBGN EQU $46
|
|
|
|
|
BLKEND EQU $48
|
2020-04-27 15:50:22 +00:00
|
|
|
BLKLEN EQU $4A ;Block Segment Length
|
2020-10-19 19:42:10 +00:00
|
|
|
SYSBFP EQU $4B ;Position in System Buffer
|
|
|
|
|
STKBGN EQU $4C ;Stack Start Address
|
|
|
|
|
STKEND EQU $4E ;Stack End Address
|
|
|
|
|
; $50-$FF ;Free Zero Page for Applications
|
2020-10-11 18:45:01 +00:00
|
|
|
|
|
|
|
|
SYSBFL EQU 128 ;System Buffer Size (Max String Size)
|
|
|
|
|
SYSBFR EQU $0200 ;System Buffer
|
2020-10-19 19:42:10 +00:00
|
|
|
; $0281-$03FF ;Unused
|
2020-10-11 18:45:01 +00:00
|
|
|
|
2020-04-27 15:50:22 +00:00
|
|
|
;Memory Mapped I/O
|
|
|
|
|
_KBHIT EQU $FFF0 ;Is a Key Pressed
|
|
|
|
|
_GETCH EQU $FFF1 ;Read Keyboard (Blocking)
|
|
|
|
|
|
2020-10-11 18:45:01 +00:00
|
|
|
ORG $0400 ;START at RAM midpoint
|
2020-04-27 15:50:22 +00:00
|
|
|
|
|
|
|
|
START: JMP MAIN ;Execute Program
|
|
|
|
|
|
|
|
|
|
;Read Character from Console
|
2020-10-16 02:58:12 +00:00
|
|
|
GETKEY EQU $FFE0 ;Emulator _GETCH Routine
|
2020-04-27 15:50:22 +00:00
|
|
|
|
|
|
|
|
;Poll Character from Keyboard
|
|
|
|
|
POLKEY: BRK ;Exit Emulator
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;Wait for Character from Console
|
2020-10-16 02:58:12 +00:00
|
|
|
GETCHR: JSR GETKEY ;Get Key from Console
|
|
|
|
|
BEQ GETCHR ;If None Pressed, Loop
|
|
|
|
|
RTS
|
|
|
|
|
|
|
|
|
|
;Read Character from stdin
|
|
|
|
|
RDCHAR: LDA $FFEA ;Read Character from STDIN
|
2020-04-27 15:50:22 +00:00
|
|
|
CMP #$FF ;If EOF
|
2020-10-16 02:58:12 +00:00
|
|
|
BNE RDCHAX
|
|
|
|
|
LDA #0 ; Set to ASCII NUL
|
|
|
|
|
RDCHAX ORA #0 ;Set Flags
|
2020-04-27 15:50:22 +00:00
|
|
|
RTS
|
|
|
|
|
|
|
|
|
|
;Delete Previous Character
|
|
|
|
|
DELCHR: LDA #$08 ;Load Backspace into Accumulator
|
|
|
|
|
JSR PUTCHR ; and Print it
|
2020-10-16 02:58:12 +00:00
|
|
|
LDA #$20 ;Load Space into Accumulator
|
2020-04-27 15:50:22 +00:00
|
|
|
JSR PUTCHR ; and Print it
|
|
|
|
|
LDA #$08 ;Load Backspace into Accumulator
|
|
|
|
|
JMP PUTCHR ; and Print it
|
|
|
|
|
|
|
|
|
|
;Advance Character to Next line
|
2020-10-16 02:58:12 +00:00
|
|
|
NEWLIN: LDA #$0D ;Load Carriage Return into Accumulator
|
|
|
|
|
JSR PUTCHR ; and Print it
|
|
|
|
|
LDA #$0A ;Load Line Feed into Accumulator
|
2020-04-27 15:50:22 +00:00
|
|
|
JMP PUTCHR ; and Print it
|
|
|
|
|
|
|
|
|
|
;Print Character to Console
|
2020-04-27 16:53:59 +00:00
|
|
|
PUTCHR EQU $FFE3 ;Emulator CHROUT Routine
|
2020-04-27 15:50:22 +00:00
|
|
|
|
2020-10-16 02:58:12 +00:00
|
|
|
;Write Character to stdout
|
|
|
|
|
PRCHAR: STA $FFEA ;Read Character from STDIN
|
|
|
|
|
RTS
|
|
|
|
|
|
2020-04-27 16:53:59 +00:00
|
|
|
EXIT EQU $FFEC ;Emulator SHUTDN Routine
|
2020-04-27 15:50:22 +00:00
|
|
|
|
2020-10-11 18:45:01 +00:00
|
|
|
FSCMD EQU $FFE6 ;run6502 File System Command Routine
|
|
|
|
|
|
2020-10-16 02:58:12 +00:00
|
|
|
INCLUDE "prbyte.a02" ;PRBYTE and PRHEX routines
|
|
|
|
|
INCLUDE "putstr.a02" ;PUTSTR routine
|
|
|
|
|
|
