See all articles from The Plotter v12 n6
100 IF IN 127=255 THEN BEEP .1, 0: BEEP 1,5: PRINT IN 127;: PRINT " Hold up, I'm not ready to print. Am I on line? Am I busy printing? Check me out now."\n110 IF IN 127<>255 THEN PRINT I N 127;: PRINT " OK, I'm on line and ready"\n120 REM it would be safer to use the address from line 110 for IN 127 and make it IF IN 127=address THEN PRINT IN 127; etc