IBM 8658 User Guide - Page 55

System, board, locations

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Table 7. Switches 1-8 (continued) Switch number Switch description 5 Power-on override. The default setting is Off (disabled). 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. 6 Clock frequency selection. The default setting is Off. When On, sets the host bus speed to 100 MHz. When Off, the host bus speed is 133 MHz. 7 Reserved. The default setting is Off. 8 Bypass power-on password. The default setting is Off. When On, bypass the power-on password. When Off, require the user to enter the power-on password at startup, if one is set. Table 8. Microprocessor speed settings Microprocessor speed Switch 1 667/133 On 733/133 On 800/133 Off 866/133 Off 933/133 Off Switch 2 On Off On Off On Switch 3 Off Off On On Off Switch 4 Off Off On On On Note: The speed settings shown above apply only to unlocked processors. If the processors are production level they are locked and there is no need to change the speed settings. System board LED locations The following illustration identifies system-board LEDs. You may need to refer to this figure when troubleshooting a problem. 1 Secondary microprocessor failure (CR7) Installing options 45

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Table
7.
Switches
1-8
(continued)
Switch
number
Switch
description
5
Power-on
override.
The
default
setting
is
Off
(disabled).
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.
6
Clock
frequency
selection.
The
default
setting
is
Off.
When
On,
sets
the
host
bus
speed
to
100
MHz.
When
Off,
the
host
bus
speed
is
133
MHz.
7
Reserved.
The
default
setting
is
Off.
8
Bypass
power-on
password.
The
default
setting
is
Off.
When
On,
bypass
the
power-on
password.
When
Off,
require
the
user
to
enter
the
power-on
password
at
startup,
if
one
is
set.
Table
8.
Microprocessor
speed
settings
Microprocessor
speed
Switch
1
Switch
2
Switch
3
Switch
4
667/133
On
On
Off
Off
733/133
On
Off
Off
Off
800/133
Off
On
On
On
866/133
Off
Off
On
On
933/133
Off
On
Off
On
Note:
The
speed
settings
shown
above
apply
only
to
unlocked
processors.
If
the
processors
are
production
level
they
are
locked
and
there
is
no
need
to
change
the
speed
settings.
System
board
LED
locations
The
following
illustration
identifies
system-board
LEDs.
You
may
need
to
refer
to
this
figure
when
troubleshooting
a
problem.
±1²
Secondary
microprocessor
failure
(CR7)
Installing
options
45