/* C02 System Header file for Commander X16 */

/* Platform Specific Settings */
#pragma zeropage $68  //Unused Zero Page - $68-$7F 

/* Platform Specific Constants */
#define DELKEY $14 //Delete/Backspace Key (DEL)
#define ESCKEY $03 //Escape/Break Key (STOP)
#define RTNKEY $0D //Return/Enter Key (RETURN)

/* Standard Library Pointers */
zeropage char srclo,srchi;   //Source Pointer for Library Functions
zeropage char dstlo,dsthi;   //String Pointer for Library Functions
zeropage int srcptr,dstptr;  //Source, Destination Pointers      
zeropage char bfrlo,bfrhi;   //Buffer Pointer for Library Functions
zeropage char blklo,blkhi;   //Block Segment Pointer
zeropage char stklo,stkhi;   //Stack Pointer
zeropage char xadrlo,xadrhi; //Physical Address LSB, MSB  

/* Standard 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
char xmbank;        //Physical Bank

/* System Subroutines */
void delchr(); //Delete previous character
char getkey(); //Read ASCII character from Keyboard
char getpos(); //Get Cursor Position
char getsiz(); //Get Screen Size
void newlin(); //Advance cursor to beginning of next line
char polkey(); //Poll Keyboard for character
char putchr(); //Print ASCII character to Keyboard
void prbyte(); //Print Accumulator as Hexadadecimal number
void prhex();  //Print Low Nybble of Accumulator as Hex Digit
char getchr(); //Wait for character from Keyboard
void setpos(); //Set Cursor Position

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