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ERS II Multiplexor


Multiplexor

A multiplexor (mux) integrated into the Series II Subsystems allows a single monitor, keyboard, mouse, and floppy drive to be shared by multiple processors. In addition, many of the front panel functions, such as the reset processor pushbutton, will only affect the selected BC processor. (The selected BC's slot number displays on the front panel.)

The multiplexor is a printed circuit board located between the disk drive bay and the processor bay. The mux board is installed vertically and crosswise in the subsystem.

The mux operates on the concept of channels (refer to Figure 3-4 ). There is a separate mux channel for each possible BC processor in the subsystem, yielding a total of eight mux channels. The mux connects the BC processors to the monitor, keyboard, mouse, and floppy disk drive (these peripherals are referred to as the "muxed devices"). An operator may select a BC processor via the front panel of the subsystem. When a BC is selected, the mux enables the channel corresponding to that BC, allowing the signals for the monitor, keyboard, mouse, and floppy drive to pass through the channel to the selected BC processor. When a different BC is selected by the operator, the mux enables the channel of the new BC processor which takes control of the muxed devices.

In addition to muxing the monitor, keyboard, mouse, and floppy devices between processors in a single subsystem, the multiplexor shares all of these devices except the floppy drive between multiple subsystems installed in a single Cubix System 1010 cabinet. This allows a single monitor, keyboard, and mouse to service all of the processors in a cabinet. One floppy drive is required per subsystem to service all of the processors in that enclosure.

 

Figure 3-4
ERS II Multiplexor (Rear View)

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