RCA 70/700 Series Reference Manual page 122

Table 3-5 Operational Word 1 (OW-I)
Bit Function
2, 1, 0
(Cont'd)
011 Take actions if the sequence counter
setting is 10.
100 Take actions if the sequence counter setting
is 01 and the character in the character
store (LSW-F bits 0-8) is identical to the
character in the character transfer store
(LSW-B bits 0-8) (that is, the previous
control character and the present control
character appearing on the line are identical.)
If the current character is not identical
to the previous character, the sequence counter
is reset to 00, but after this, the sequence
counter will still be modified as specified
by bits 7 & 8. For example if bits 8, 7=11,
the sequence counter is advanced from
00 to 01.
101 Take action if the sequence counter setting
is 11 and the character in LSW-F bits 0-8 is
identical to the character in LSW-B bits 0-8.
110
III
I
j
If the current control character is not identical
to the previous control character, the seq-
uence counter is reset to 00, but will then
be modified as specified by bits 7 & 8.
These settings are not to be used. (unassigned)
3 (not used) Not used (Set to zero)
5, 4
(In data
Block)
OW-l
When the conditions of the action control bits are
satisfied, bits 5, 4 set or reset bit 13 of LSW-C,
the In Data Block Bit. (The In Data Block bit when
set (1) during receive operations permits data char-
acters to be sent to the processor, when reset (0) inhibits
sending data characters to the processor. The bit also
may be a condition for accessing an operational word -
See Figure 1-2, page 1-12. Control characters are
not affected by In Data Block but are affected by bit
15 of OP WORD 1.
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