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Left to its own devices, APL plots on the bus

The IEEE-488 General-Purpose Interface Bus is a convenient vehicle through which APL can run a variety of devices and computers. This paper shows how a PC can be used with APL as a device on the bus, in contrast to the PC's more usual role as system controller. As an example, an APL workspace that emulates an x-y plotter attached to the GPIB is shown. This illustrates the GPIB providing input to an APL workspace, and techniques by which APL can report the status of the device.