HP 3000 Manuals HP 3000 Manuals
Initial Startup Procedures
The first step in starting or restarting MPE XL is the execution of a
hard or soft system reset. A hard reset executes a series of hardware
diagnostics before resetting the system, and resets system memory. A
soft reset does not reset system memory.
Executing Hard and Soft System Resets
You can execute a hard reset by pressing the RESET button on the control
panel of the CPU. You also can execute either a hard or soft reset from
the System Console, but the system must first be placed in Control Mode.
The system also will reset automatically when powered up.
Placing the System in Control Mode
The system is placed in Control Mode when you enter CTRL B at the
keyboard of the System Console. In Control Mode, the System Console
communicates with the system hardware directly through the Console's own
hardware port (called the Access Port).
Controlling System Hardware Via the Access Port
The System Operator (also referred to as the Console Operator) controls
the system hardware through the Access Port, using a set of Access Port
Commands. This command set (described in Table 2-1 ) includes the
hard (RS) and soft (TC) reset commands.
Summary of MPE XL System Startup Procedures
The system can be started automatically, or with operator intervention
(manual startup). A manual startup lets you modify boot paths, select a
different startup utility, and run certain utilities from the Initial
System Loader (ISL).
Automatic System Startup
In brief, the automatic system startup sequence looks like this:
With system power switched on, either
* Execute a hard system reset by pressing the RESET button on the
front panel of the system, or enter CTRL B and RS at the
hard-wired System Console.
OR
* Execute a soft system reset by entering CTRL B and TC at the
hard-wired System Console.
* ROM-based Processor Dependent Code (PDC) and I/O Dependent Code
(IODC) are loaded into main memory during initialization, and read
and initialize the boot paths.
* The operating system automatically loads and starts, and the
system comes up ready for use if the following conditions are
true:
* The AUTOBOOT flag is on,
* The AUTOEXECUTE file is installed,
* The System Operator does not respond to an override prompt.
System Startup With Operator Intervention
In brief, the manual system startup sequence looks like this:
With system power switched on, either
* Execute a hard system reset by pressing the RESET button on the
control panel of the system, or enter CTRL B and RS at the
hard-wired System Console.
OR
* Execute a soft system reset by entering CTRL B and TC at the hard
wired System Console.
* ROM-based Processor Dependent Code (PDC) and I/O Dependent Code
(IODC) are loaded into main memory during initialization, and read
and initialize the boot paths.
* The boot sequence pauses or stops to permit boot path selection or
modification, then stops again at the Initial System Loader (ISL>)
prompt, if the following conditions are true:
* The AUTOBOOT flag is OFF,
OR
* The AUTOBOOT flag is ON but no AUTOEXECUTE file is
installed,
OR
* The AUTOBOOT flag is ON and an AUTOEXECUTE file is
installed, but the System Operator responds to the override
prompt by pressing any key within 10 seconds.
Following a manual boot sequence, the System Operator starts the system
by entering (at the ISL> prompt) one of the start utilities listed in
Table 2-3 .
Regardless of the status of the AUTOBOOT flag, if an AUTOEXECUTE file
does not exist, the PDC, IODC, and Initial Program Loader (IPL) boot the
system and load the Initial System Loader (ISL). At this point, the
System Operator has manual control over the startup procedure and starts
the system by entering (at the ISL> prompt) one of the start utilities
described in Table 2-3 and Table 2-4 .