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C02/include/vic20.h02
2020-10-11 14:45:01 -04:00

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/* Unexpanded VIC 20 Header File */
/* Platform Specific Constants */
#define DELKEY $14 //Delete/Backspace Key (DEL)
#define ESCKEY $03 //Escape/Break Key (STOP)
#define RTNKEY $0D //Return/Enter Key (RETURN)
#define SYSBFL 88 //System Buffer Length
/* Standard Library Pointers */
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
/* 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 sysbfr[], sysbfp; //System String Buffer and Position
/* 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