/* VIC 20 with 8k Expansion Header File */

/* Platform Specific Settings */
#pragma zeropage $FB $FE //Zero Page Free Space

/* Platform Specific Constants */
#define DELKEY $14 //Delete/Backspace Key (DEL)
#define ESCKEY $03 //Escape/Stop Key (STOP)
#define RTNKEY $0D //Return/Enter Key (RETURN)
#define SYSBFL  88 //System Buffer Length

/* Standard Library Variables */
zeropage int srcptr, dstptr;  //Source and Destination Pointer
zeropage int blkptr, stkptr;  //Block and Stack Pointers
zeropage int tmpptr, usrptr;  //Temporary and User Pointer
int stkbgn, stkend;   //Stack Begin and End Address
int blkbgn, blkend;   //Block Begin and End Address
char blklen, xmbank;  //Block Segment Length, Ext Memory Bank
int xmaddr;           //Extended Memory Address
char random, rdseed;  //Pseudo-Random Number and Seed
char temp0, temp1, temp2, temp3; //Temporary Storage
char sysbfr[], sysbfp; //System String Buffer and Position

/* System Subroutines */
void delchr(); //Delete previous character
char getchr(); //Wait for character from Console
char getkey(); //Read ASCII character from Console
void newlin(); //Advance cursor to beginning of next line
char polkey(); //Poll Console for character
void prbyte(); //Print Accumulator as Hexadecimal number
void prhex();  //Print Low Nybble of Accumulator as Hex Digit
char putchr(); //Print ASCII character to Console
char putstr(); //Print ASCII string to Console

/* System Labels */
start:  //Start of Code
exit:   //Return to Operating System