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C02/apple2/include/a2min.h02

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/* C02 Minimal Header File for Apple II */
/* Monitor Variables */
//PIA 6820 Registers
char kbd; //Keyboard Data
char kbdcr; //Keyboard Control Register
//Monitor Subroutines
void echo(); //Print Character in Accumulator
void prbyte(); //Print Accumulator as Hexadadecimal number
void prhex(); //Print Low Nybble of Accumulator as Hex Digit
//System Subroutines
char rdkey(); //Wait for raw character from Keyboard