IBM 5000 manual System Board Switches, System Board Switch Block SW1

System Board Switches

System Board Switches

The following table provides the system switch identifiers and descript

switches. The system switch block is identified.3/ in thebyillustrationkey at “System Board Connectors” on page 169.

Note: Turn off the server and disconnect the power cord before moving switches.

Table

17. System Board Switch Block SW1

Identifier

Switch

Description

1

Switches

1,

2,

3,

and

4

in

combination specify the frequency for the micr

See

Table 18

on

page 171

for

details.

2

Switches

1,

2,

3,

and

4

in

combination specify the frequency for the micr

See

Table 18

on

page 171

for

details.

3

Switches

1,

2,

3,

and

4

in

combination specify the frequency for the micr

See

Table 18

on

page 171

for

details.

4

Switches

1,

2,

3,

and

4

in

combination specify the frequency for the micr

See

Table 18

on

page 171

for

details.

5

When

On,

perform

BIOS

recovery using

boot

block

(boot

block

recovery).

The recovery boot block is in a protected area of flash memory that canno

overwritten. When the BIOS becomes corrupted (for

example,

if

a

power

fai

occurs during a flash update), the recovery

boot

block

can

be

used

to

re

BIOS. The code in the recovery boot

block

enables

the

server

to

start

up

flash diskette. The flash utility automatically

recovers

the

system

BIOS

from

BIOS

recovery

files

on

the

diskette. When

the

flash

is

complete,

the

switc

moved

to

the

Off

position.

The

default

setting

is

Off

(disabled).

6

When

On,

sets

the

host

bus

speed

to

66 MHz. When

Off,

the

host

bus

spee

MHz.

The

default

setting

is

Off.

7

Power-on

override.

When

On,

overrides

the

power-on switch and forces

power-on

mode. The

system

will

always boot

without

the

use of the power-on switch.

The

default

setting

is

Off

(disabled).

8When On, bypass the power-on password. When Off, require the user to enter power-on password at startup if one is set.

The default setting is Off.

170 Netfinity 5000 Server Hardware Information and Procedures