Control Data Cyber 170 State Hardware Reference Manual page 168

Output from
A
on channel d
This instruction transfers a word from the
A register (lower 12 bits) to output
channel d.
NOTE
If bit 5 of d is clear and the channel i s
inactive, this instruction hangs the
PP,
waiting for the channel to go active and full,
if executed. I f bit 5 of d is set and the
channel is inactive, the program continues at
P plus 1 . The word is not transferred.
73dm Output
A
words from m on channel d OAM m,d
This instruction transfers a block of words from PPM to channel d.
The first
word is read from the address specified by
m.
The A register holds the number
of words to be sent. A
reduces by
1
as each word is read. The output
operation completes when A equals 0 or the channel becomes inactive.
During this instruction, address 0000 temporarily holds P while m is held in
the P register.
P
advances by 1 to give the address of the next word as each
word is read from the PPM.
NOTE
If this instruction executes when the data
channel is inactive, no output operation is
accomplished, and the program continues at P
plus 2.