: UNIBUS Addresses

24.10 UNIBUS Addresses

The Receiver Status Register always has its lowest address starting on a four word boundary. (The addresses which follow are all 18 bit octal addresses.)

	Receiver	Transmitter
	Status	Status
Operator’s console	777560 $\rightarrow$	777566
Group Two	776500 $\rightarrow$	776506
	776510 $\rightarrow$	77656
	776670 $\rightarrow$	776676
Group Three	775610 $\rightarrow$	775616
	775620 $\rightarrow$	775626
	776170 $\rightarrow$	776176

Apart from the operator’s console interface which has its own standard UNIBUS location, the interfaces are gathered into two groups (for reasons which are irrelevant here). Within each group, by convention, registers are allocated in consecutive locations starting at the lowest address.