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Table 2-6.
CE Panel Indicators (Part 4 of 8)
Indicator
END SERVICE
CONTROL
CI R B (Circle B)
SERVICE CONTROL
MDW-2 SERVICE
CONTROL
COMMAND
RE GI STE R (0-7)
COMMAND ADDRESS
REGISTER (0-7)
LO ADR VAL
(Low Address Val id)
HI ADR VAL
(High Address Valid)
HALT I/o
VAL CMND
(Valid Command)
CMND CHN
(Command Chain)
CHN HOLD
STR I/O CYC
(Start I/O Cycle)
CU (Control
Unit) BUSY
CMND CYC
(Command Cycle)
STK (Stack)
CMND PTY (Command
Parity Error)
Definition
One indicator (B-2-32). Indicates a status cycle is being performed. The status field
in MCW -2 will be transferred to the channe I vi a Bus In.
One indicator (B-2-33). Indicates that a write service cycle for 1050 terminal type
is being performed. Data is being passed from the channel to MDW's via Bus Out.
One indicator (B-2-34). The data being serviced will be between core storage and the
channel. ON indicates REC or TSM service for MDW-2. OFF indicates REC or TSM
service for MDW-1. Used on BSC lines only.
Eight indicators (B-3-2 to B-3-9). Displays the configuration of the command or
instruction issued to the control unit on a Start I/O cycle. The display is valid
from the time the command is placed in the register to insertion into core storage.
Eight indicators (B-3-10 to B-3-17). Indicates the address of the specific line
selected on a Start I/O cycle. This register provides the address bits (0-7) to the
Storage Address Bus for selection of MCW-1 and MCW-2 during a Start I/O command.
One indicator (B-3-18). Signifies that the line address being selected does not exceed
the lower limit of the addresses assigned to the 2703.
One indicator (B-3-19). Signifies that the line address being selected does not
exceed the upper limit of the addresses assigned to the 2703.
One indicator (B-3-20). Activated as a result of a Halt I/O issued to the 2703 on a
Start I/O.
Cne indicator (B-3-21). The command or instruction issued to the 2703 on initial
selection has correct parity and is a valid command.
One indicator (B-3-22). Indicates that command chaining will occur to the line
presently transferring ending status to the channel. This operation will result only
from a status-service cycle.
One indicator (B-3-23). Indicates that reselection for command chaining has occurred.
The Chain Hold indicator does not become active if command chaining is aborted.
One indicator (B-3-24). Indicates the time the 2703 is attached to the channel during
a Start I/o cycle.
One indicator (B-3-25). Indicates CU Busy signaled over the interface. This will
occur if selection is attempted while interface controls are busy as a result of a pre-
vious operation.
One indicator (B-3-26). Indicates that a command or stacked status resulting from a
Start I/O cycle must be placed in storage.
One indicator (B-3-27). This indicator is active when initial status presented to the
channel on an initial-selection sequence was rejected. This status must be placed in
storage and presented on a subsequent status cycle.
One indicator (B-3-31). Indicates that the command or instruction issued on a Start
I/O cycle contained improper parity on Bus Out.
Operations
2-21
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