Control Data Cyber 170 State Hardware Reference Manual page 163

PP Central Memory Access Instructions
Central Write
62d Central write to (A) from d CWD d
This instruction assembles five 12-bit words from consecutive PP memory
locations into one 60-bit word and stores the 60-bit word in central memory.
The first 12-bit word is stored in the leftmost 12 bits of the 60-bit word.
(PP memory addressing is cyclic, and location 0000 follows location 7777.)
The parameters of the transfer are
a a
follows: If bit 17 of A is 0, A bits 0
through 16 contain the absolute address of the 60-bit word stored. If bit 17
of A is 1, hardware adds relocation register R to zero-extended A bits 0
through 16 to obtain the absolute address of the 60-bit word stored. For
further information, refer to R Register under Input/Output Unit in chapter 2,
and PP Relocation Register Format under PP Instruction Descriptions. Field
d
gives the PP location of the first 12-bit word transferred. The transfer
is
subject to the CM bounds test.