74$004ACKEYCassette boot request flag on coldstartnoneA
1001$03E9CKEYCassette boot request flag on coldstartnoneX

Checks to see if the START key is pressed and, if so, CKEY is set. Autoboot cassettes are loaded by pressing the START console key while turning the power on. In response to the beep, press the PLAY button on the recorder.