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Added run6502 header files

This commit is contained in:
Curtis F Kaylor 2020-04-27 11:50:22 -04:00
parent a750604538
commit fd7e1a708b
2 changed files with 125 additions and 0 deletions

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;run6502 program initialization code for c02 programs
;System Specific ASCII Key Mappings
DELKEY EQU $08 ;Delete/Backspace Key (Backspace)
ESCKEY EQU $18 ;Escape/Stop Key (Control-X)
RTNKEY EQU $0A ;Return/Enter Key (Line Feed)
;Zero Page Locations
SRCPTR EQU $30 ;Source String Pointer (stdio.a02)
SRCLO EQU $30
SRCHI EQU $31
DSTPTR EQU $32 ;Destination String Pointer (string.a02)
DSTLO EQU $32
DSTHI EQU $33
BFRPTR EQU $34 ;Work Buffer Pointer
BFRLO EQU $34
BFRHI EQU $35
BLKPTR EQU $36 ;Block Segment Pointer (block.a02)
BLKLO EQU $36
BLKHI EQU $37
STKLO EQU $38 ;Stack Pointer (stack.a02)
STKHI EQU $39
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
BLKSLO EQU $46 ;Block Start Address
BLKSHI EQU $47
BLKELO EQU $48 ;Block End Address
BLKEHI EQU $49
BLKLEN EQU $4A ;Block Segment Length
STKSLO EQU $4C ;Stack Start Address
STKSHI EQU $4D
STKELO EQU $4E ;Stack End Address
STKEHI EQU $4F
;Memory Mapped I/O
_KBHIT EQU $FFF0 ;Is a Key Pressed
_GETCH EQU $FFF1 ;Read Keyboard (Blocking)
ORG $8000 ;START at RAM midpoint
START: JMP MAIN ;Execute Program
;Read Character from Console
GETKEY EQU $FFF4 ;Emulator CHRIN Routine
;Poll Character from Keyboard
POLKEY: BRK ;Exit Emulator
;Wait for Character from Console
GETCHR: JSR GETKEY ;Read Character from STDIN
CMP #$FF ;If EOF
BNE GETCHX
LDA #ESCKEY ; Set to Escape Character
GETCHX: ORA 0 ;Set Zero Flag
RTS
;Delete Previous Character
DELCHR: LDA #$08 ;Load Backspace into Accumulator
JSR PUTCHR ; and Print it
LDA #$20 ;Load Space into Accumulater
JSR PUTCHR ; and Print it
LDA #$08 ;Load Backspace into Accumulator
JMP PUTCHR ; and Print it
;Advance Character to Next line
NEWLIN: LDA #RTNKEY ;Load Line Feed into Accumulater
JMP PUTCHR ; and Print it
;Print Character to Console
PUTCHR EQU $FFF6 ;Emulator CHROUT Routine
EXIT EQU $FFF8 ;Emulator SHUTDN Routine
INCLUDE "../include/prbyte.a02" ;PRBYTE and PRHEX routines
INCLUDE "../include/putstr.a02" ;PUTSTR routine

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/* run6502 Header File */
//Platform Specific Constants
#define DELKEY $08 //Delete/Backspace Key
#define ESCKEY $18 //Escape/Stop Key
#define RTNKEY $0D //Return/Enter Key
//Library Pointer Variables
zeropage int srcptr, dstptr, bfrptr, blkptr;
char srclo,srchi; //Source String Pointer for Library Functions
char dstlo,dsthi; //Destination String Pointer for Library Functions
char bfrlo,bfrhi; //Buffer Pointer for Library Functions
char blklo,blkhi; //Block Segment Pointer
char stklo,stkhi; //Stack Pointer
//Library Variables
char blkslo, blkshi; //Block Start Address
char blkelo, blkehi; //Block End Address
char blklen; //Block Segment Length
char stkslo, stkshi; //Stack Start Address
char stkelo, stkehi; //Stsck End Address
char random, rdseed; //Pseudo-Random Number Generation
char temp0, temp1, temp2, temp3; //Temporary Storage
//Memory Mapped I/O
char putcon; //Write Character to Console
char getcon; //Read Character from Console
//System Subroutines
char polkey(); //Poll Console for character (Exits Emulator)
char getchr(); //Wait for character from Console
char getkey(); //Read ASCII character from Console (Exits Emulator)
void newlin(); //Advance cursor to beginning of next line
void delchr(); //Delete previous character
char putchr(); //Print ASCII character to Console
void prbyte(); //Print Accumulator as Hexadadecimal number
void prhex(); //Print Low Nybble of Accumulator as Hex Digit
//System Labels
start: //Start of Code
exit: //Return to Operating System