IBM 2702 Information Manual page 40

Table 2-6. CE Panel Indicators (Part 7 of 8)
Indicator
SH (Shift Bit)
MODE 1 and 2
SEQUENCE 1,
2, and 4
IBM
COMMAND FIELD
(3-7)
DATA SVC
END
HALT STK (Halt/
Stack)
REC (Receive)
LRC FIELD (0-7)
SENSE Field
STATUS Field
WD PTY CHK (Word
Parity Check)
2-24
Definition
One indicator (C-1-18). Indicates an upper-case character and will be set upon
receipt of a shift sequence or character. For BSC lines, this indicator is included
in Mode Field.
Two indicators (C-1-19 and C-1-20). Used to indicate whether the line is in a con-
trol or data mode. For BSC lines, C-1-18 is included in Mode Field.
Three indicators (C-1-21 to C-1-23). The Sequence Field is used to define the oper-
ation to be carried out on the character in Buffer Field. For BSC lines, pos C-1-24
is included in this field to expand the number of possible sequences.
One indicator (C-1-25). ON for BSC lines when in Intermediate Block Check Mode
Set by Set Mode CMD.
Five indicators (C-1-26 to C-1-30). Contains in abbreviated form the command pre-
sented by the channel to this particular line of the 2703.
One indicator (C-1-31). Indicates that this line requires four more characters in a
transmit operation, or has four characters to pass to the channel in a receive opera-
tion.
One indicator (C-1-32). This bit is set when the line has ending status to pass to
the channel.
One indicator (C-1-33). This bit has dual meaning. When this bit is ON with the
End bit, it is interpreted as Stack; and, when the End bit is OFF, it is interpreted as
Halt. The Halt bit is set in the transmit direction when the channel issues a Halt I/O
and is set in the receive direction on a stop or Halt I/O from the channel. The Stack
bit is set when the channel will not accept status and asks the 2703 to stack its status.
This can occur only during the termination of a command or during initial selection
when other than all zeros are presented to the channel as status.
One indicator (C-1-34). This bit is set during a receive operation and is reset upon
termination of a receive-type command.
Eight indicators (C-2-0 to C-2-7). SIS only used to accumulate the LRC character
for those terminals having this checking ability. (BSC-LRC accumulation is in CRC).
Eight indicators (C-2-18 to C-2-25). Contains sense information to be presented to
th~
channel upon receipt of a Sense command.
Eight indicators (C-2-26 to C-2-33). Contains status information to be presented to
the channe I upon termi nati on of a command.
One indicator (C-2-34). This bit is turned ON to indicate that a core parity error
was detected during access of MCW-2. It is reset when ending status is set.