Measurement Computing Micro 488/EX rev.2.1 - Manual (Page 40)

Section 3 IEEE Operating Modes
3.6
If we are addressed to listen then we ENTER a line from the controller and print it
out.
400 'Listen state
410 PRINT#1,"ENTER"
420 LINE INPUT#1,A$
430 PRINT A$
440 GOTO 200
If we are addressed to talk then we INPUT a line from the keyboard and OUTPUT
it to the controller.
500 'Talk state
510 LINE INPUT A$
520 PRINT#1,"OUTPUT;";A$
530 GOTO 200
It is also possible to detect these conditions with the ARM or ON
DOMACRO commands and handle them in an exception as described in Section 5. The
various arm conditions and their meanings are as follows:
SRQ The internal Service Request state is set. See the SPOLL
command in Section 5.
PERIPHERAL the Micro488/EX is in the Peripheral (*CA) operating
mode.
CONTROLLER the Micro488/EX is the Active Controller (CA).
TRIGGER the Micro488/EX, as a Peripheral, has received a Trigger
bus command.
CLEAR the Micro488/EX, as a Peripheral, has received a Clear bus
command.
TALK the Micro488/EX is in the Talk state and can OUTPUT to the
bus.
LISTEN the Micro488/EX is in the Listen state and can ENTER from
the bus.
IDLE the Micro488/EX is in neither the Talk nor Listen state.