/***************************************
 * ECHO - Demo C02 program for Apple 1 *
 *        using minimal header file    *
 * Echos typed keys to display         *
 * ESC key aborts to monitor           *
 ***************************************/
 
#include "a1min.h02"

char key;  //Key value

main:
while() {
  key = rdkey();       //Read keyboard
  if (key == $9B)  //If ESCAPE pressed
    break;         //exit loop
  echo(key);       //Display character on screen
}
goto exit;