Lenovo PC 300PL Technical Information Manual 6275, 6285 - Page 26

Physical Layout, System Board, Types 6862/6892 and 6275/6285, System Board Switches

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Chapter 2. System-Board Features Physical Layout The system board might look slightly different from the one shown. Note: A diagram of the system board, including switch and jumper settings, is attached to the underside of the computer cover. System Board, Types 6862/6892 and 6275/6285 1 Battery 2 Microprocessor-speed switches 3 Microprocessor 4 DIMM 0 5 DIMM 1 6 DIMM 2 7 Clear CMOS Request jumper 8 AGP connector (PC 300PL models only) 9 Video memory connector (PC 300GL models only) Note: An illustration of the system board and additional information are provided on a label found inside the computer. System Board Switches Switches are provided on the system board to allow for custom configuration. The switches, which are contained in an eight-position switch block on the system board, are rocker switches. The side of the rocker that is pushed down is the active side. Switches 1 through 4 determine the speed of the microprocessor (CPU) and local processor bus. Switch settings for the Intel microprocessors supported by PC 300GL (Types 6275 and 6285) and PC 300PL (Types 6862 and 6892) are shown in the following table. Note that the two speeds shown for each microprocessor are the microprocessor core speed followed by the local processor bus speed (for example, 350/100 MHz). Figure 5. Microprocessor Speed (Switches 1-4) Microprocessor Switch 1 Switch 2 266/66 MHz On On 300/66 MHz Off On 350/100 MHz Off Off 400/100 MHz On On Switch 3 Off Off On Off Switch 4 On On On On PC 300GL (Types 6275 and 6285) computers are designed to support both 66 and 100MHz FSB microprocessors. Note: Only the switch values shown in the preceding table are supported. Using unsupported switch settings will cause unpredictable results. 14 Technical Information Manual

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Chapter 2.
System-Board Features
Physical Layout
The system board might look slightly different from the one shown.
Note:
A diagram of the system board, including switch and jumper settings, is attached to the underside
of the computer cover.
System Board, Types 6862/6892 and 6275/6285
1
Battery
2
Microprocessor-speed switches
3
Microprocessor
4
DIMM 0
5
DIMM 1
6
DIMM 2
7
Clear CMOS Request jumper
8
AGP connector (PC 300PL models only)
9
Video memory connector (PC 300GL models only)
Note:
An illustration of the system board and additional information are provided on a label found inside
the computer.
System Board Switches
Switches are provided on the system board to allow for custom configuration.
The switches, which are
contained in an eight-position switch block on the system board, are rocker switches.
The side of the
rocker that is pushed down is the active side.
Switches 1 through 4 determine the speed of the microprocessor (CPU) and local processor bus.
Switch
settings for the Intel microprocessors supported by PC
300GL (Types 6275 and 6285) and PC
300PL
(Types 6862 and 6892) are shown in the following table.
Note that the two speeds shown for each
microprocessor are the microprocessor core speed followed by the local processor bus speed (for
example, 350/100 MHz).
PC
300GL (Types 6275 and 6285) computers are designed to support both 66 and 100MHz FSB
microprocessors.
Note:
Only the switch values shown in the preceding table are supported.
Using unsupported switch
settings will cause unpredictable results.
Figure 5. Microprocessor Speed (Switches 1-4)
Microprocessor
Switch 1
Switch 2
Switch 3
Switch 4
266/66 MHz
On
On
Off
On
300/66 MHz
Off
On
Off
On
350/100 MHz
Off
Off
On
On
400/100 MHz
On
On
Off
On
14
Technical Information Manual