The system can operate in any one of the following states:
- 1052 state
- Utility (UTIL) state
- CRAS state
- Message switching state
- Normal (NORM) state.
To change from one state to another,
enter the ZCYCL command.
1052 state is defined as follows:
- Note:
- This is the only state from which a processor switch should be
attempted.
UTIL state is defined as follows:
CRAS state is defined as follows:
Message switching state is similar to CRAS state with the following
exceptions:
- All lines are active.
- For terminals associated with the reservation (RES) application, the only
high-speed messages accepted in the system are messages with a primary action
code of Y, Z, or O. If the primary action code is O, an additional
check is performed so that only those messages associated with message
switching are allowed. All other high-speed entries are
rejected. All low-priority (type B) input is accepted. However,
only message switching entries are processed. All low-priority
(application) reservation messages are queued until the TPF system is cycled
to NORM state.
NORM state is defined as follows:
- NORM state allows you to start all system and application
functions. All entries are allowed.
- This is the only state in which the time available supervisor (TAS) is
active.
- This is the only state in which catastrophic error recovery will be
attempted, when active.