RCA 70/700 Series Reference Manual page 120

III. (Cont
I
d)
New Description:
During CCM transmission (processor write CCW) , the
parity of each character is checked by the CCM before
the character is placed into LSW B bits 0-8 and before
the character is sent through the decoding (control
character recognition) matrix.
During CCM reception (processor read CCW), each char-
acter assembled from a communications line retains
its line parity sense despite any expansion and is
sent through the control character decoding matrix.
Parity is not checked for those characters recognized
as control characters (those calling up an operational
word) .
For transmission and reception a control character
with a parity error is no longer a control character;
it cannot cause the CCM to access an operational word.
IV. The following operational word information replaces
and supersedes the information found in Tables 3-5
and 3-6 on pages 3-17, 18, and 19.
2