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"B" Register       Device 1011

The "B" register is the right operand for ALU operations, and can contain decimal values between 0 and 65535.

Physically, the "B" register is made up of a pair of 74LS574 ICs, on a card plugged into the backplane, with connection to the shared data-bus and an input header on the ALU.

Device ID: 1011
Signals: WE, OE