mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-11-22 01:31:33 +00:00
79 lines
2.0 KiB
Plaintext
79 lines
2.0 KiB
Plaintext
|
; Orao Program Initialization Code for C02 programs
|
||
|
|
|
||
|
|
;System Specific ASCII Key Mappings
|
||
|
|
DELKEY EQU $1F ;Left Arrow
|
||
|
|
ESCKEY EQU $03 ;Ctrl-C
|
||
|
|
RTNKEY EQU $0D ;Carriage Return
|
||
|
|
NULKEY EQU $00 ;Null
|
||
|
|
|
||
|
|
;Zero Page Locations
|
||
|
|
SRCLO EQU $30 ;Source String/Array Pointer
|
||
|
|
SRCHI EQU $31
|
||
|
|
DSTLO EQU $32 ;Destination String/Array Pointer
|
||
|
|
DSTHI EQU $33
|
||
|
|
BFRLO EQU $34 ;Work Buffer Pointer
|
||
|
|
BFRHI EQU $35
|
||
|
|
|
||
|
|
STKSAV EQU $36 ;Stack Pointer Storage
|
||
|
|
RDSEED EQU $37 ;Pseudo-RANDOM Seed
|
||
|
|
RANDOM EQU $38 ;Pseudo-RANDOM Number Storage
|
||
|
|
TEMP0 EQU $3A ;Temporary Storage
|
||
|
|
TEMP1 EQU $3B
|
||
|
|
TEMP2 EQU $3C
|
||
|
|
TEMP3 EQU $3D
|
||
|
|
|
||
|
|
BLKBGN EQU $40 ;Block Start Address
|
||
|
|
BLKEND EQU $42 ;Block End Address
|
||
|
|
BLKPTR EQU $44 ;Block Pointer
|
||
|
|
BLKLEN EQU $46 ;Block Segment Length
|
||
|
|
|
||
|
|
STKSLO EQU $48 ;Stack Start Address
|
||
|
|
STKSHI EQU $49
|
||
|
|
STKELO EQU $4A ;Stack End Address
|
||
|
|
STKEHI EQU $4B
|
||
|
|
STKLO EQU $4C ;Stack Pointer
|
||
|
|
STKHI EQU $4D
|
||
|
|
|
||
|
|
ORG $1000 ;Program Start Address
|
||
|
|
|
||
|
|
START: TSX ;Save Stack Pointer
|
||
|
|
STX STKSAV
|
||
|
|
JMP MAIN ;Execute Program
|
||
|
|
|
||
|
|
|
||
|
|
;Exit Program and Return to Operating System or Monitor
|
||
|
|
EXIT LDX STKSAV ;Restore Stack Pointer
|
||
|
|
TXS
|
||
|
|
RTS ;and Return to Caller
|
||
|
|
|
||
|
|
RESET EQU $FFA3 ;Alias to WARMST (Monitor)
|
||
|
|
|
||
|
|
;Poll Character from Keyboard
|
||
|
|
POLKEY: JSR $E5B0 ;Scan Keyboard
|
||
|
|
BCC POLKEX ;If No Key Pressed
|
||
|
|
LDA #NULKEY ;Return NUL
|
||
|
|
POLKEX: RTS
|
||
|
|
|
||
|
|
;Read Character from Console
|
||
|
|
GETKEY EQU $E500 ;Alias to INCHR function
|
||
|
|
|
||
|
|
;Wait for Character from Console
|
||
|
|
GETCHR EQU GETKEY ;Alias to GETKEY
|
||
|
|
|
||
|
|
;Print Character to Screen
|
||
|
|
PUTCHR EQU $E762 ;Alias to OUTCH Routine
|
||
|
|
|
||
|
|
;Delete Previous Character
|
||
|
|
DELCHR EQU $F1F2 ;Alias to BCKSPC Routine
|
||
|
|
|
||
|
|
;Advance Cursor to Next line
|
||
|
|
NEWLIN EQU $E7F6 ;Aliased to CRLF Routine
|
||
|
|
|
||
|
|
;Print Byte as Two-Digit Hex Number to Console
|
||
|
|
PRBYTE EQU $E803
|
||
|
|
|
||
|
|
;Print Low Nybble as Hex Digit to Console
|
||
|
|
PRHEX EQU $E80F
|
||
|
|
|
||
|
|
INCLUDE "../include/putstr.a02" ;PUTSTR Routine
|