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Channel Selection Panel

The four CH NUM (Channel Number) lamps indicate in binary what channel is currently selected. This reading changes dynamically during program execution as different channels are selected by software.

When the computer is halted, the Operator can select the channel manually. This is done by entering the channel number in binary using the four least significant Entry Switches, then pressing the SET button near the CH NUM lamps.

Lamps WR, RD illuminate when the selected channel is being written or read, respectively.

As mentioned in section "I/O Architecture", peripherals are expected to have two internal registers exposed to the channel: DATA and CONTROL. The lamp CTL illuminates when the peripheral's CONTROL register is being read or written