// 
//   echo.jas
//
//   Author
//     Dan Stone
//
//   Description
//     Sample assembly program that reads a key press and echoes the result to 
//     standard output.  
//


.main

L1:   IN           // request character input from memory
      DUP          // duplicate top of stack (inputed char) for comparing
      BIPUSH 0x0   // push 0x0 for comparison
      IF_ICMPEQ L2 // if no characters are available for input, loop
      OUT          // else, print character
      GOTO L1      // loop back to beginning of program


L2:   POP          // No key has been pushed, so clear the stack,
      GOTO L1      // and start over
.end-main