Setting The Key Mode Switch - IBM R30 Operator's Manual

Setting the Key Mode Switch

The key mode switch has three positions:
– Normal
– Secure
– Service
The switch is used to establish the initial program load (IPL) path. The IPL loads the system
programs, checks the system hardware, and prepares the system for user operation.
Before starting the system unit for normal day-to-day operation, set the key mode switch to
the Normal (
self-tests (POSTs) are completed.
This system has an electronic mode switch feature. This feature allows the operator to
change the IPL mode from the SystemGuard console or system console without changing
the physical key mode switch. This function is controlled by flags (permissions). The
functions of the electronic mode switch are the same as the physical key mode switch. Refer
to "Physical and Electronic Key" on page 3-4.
Note: It is possible to set the Electronic Mode Switch (E-Key) through SystemGuard
firmware from the local or remote SystemGuard BUMP console. In Normal mode an
electronic key may be used to set Normal, Secure and Service modes. For remote
maintenance, see "Electronic Mode Switch" page 3-4. In Secure and Service
modes, the physical key setting prevails.
Operator Panel
) position. This permits the operating system to load after the power-on
Normal
Secure
Service
Key Mode Switch
Using the CPU Enclosure
2-3