RCA 301 Programmer's Reference Manual page 171

8 Tape Write Normal (TWN)
General Description
This instruction is used to transmit data from the HSM of one processor to the HSM of another processor
provided both are equipped with a Data Exchange Control. This instruction operates in the Normal Mode.
Format
Operation —8
N — H (first unit)
I (second unit)
A Address — Location in HSM of the first diad to be transferred. This address must be even.
B Address — Location in HSM of the last diad to be transferred. This address must be even.
Direction of Operation
Left to right.
Outline of Operation
Same as the Tape Write Normal instruction for tape (pg. IX-10) with the following exceptions:
1. When this instruction is staticized a flip-flop is set in the receiving computer which, when sensed, will
indicate that this computer is in the transmitting mode.
2. This instruction is terminated by AB equality. When it is terminated, a terminate signal is sent to the
receiving computer.
Final Register Contents
(A) = (B), + 2
t
(B) = (B),
(
Timing
The data transfer rate is dependent upon the mode in which the transfer is made and the availability of status
levels in both processors.
u/-~
XIII-5