IBM 220 System-board jumpers and switches, System-board jumper blocks, System-board switch block

Models: 220

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System-board jumpers and switches

System-board jumpers and switches

The following illustration identifies the jumpers and switches on the system board.

Switch block

Flash ROM page-swap jumper (J38)

System-board jumper blocks

Any jumper blocks on the system board that are not shown in the illustration are reserved. For normal operation of the system, no jumpers should be installed on any of the jumper blocks. See “Recovering the BIOS code” on page 97 for information about the flash ROM page-swap jumper.

System-board switch block

The switch block contains microswitches 1 through 8. As pictured in this illustration, switch 8 is at the right of the switch block, and switch 1 is at the left.

The following table describes the function for each switch. The default setting is Off for all switches in the switch block.

Switch

Switch

number

description

 

 

8

Power-on password-override switch.

 

When toggled to the side that is opposite the default position, bypasses

 

the power-on password, if one is set.

 

 

7

Reserved.

 

 

6

Reserved.

 

 

5

Force power on.

 

 

4

Reserved.

 

 

3

Reserved.

 

 

2

Reserved.

 

 

1

Reserved.

 

 

Table 3. Switches 1 through 8

30 IBM® xSeries 220 User’s Reference

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IBM 220 manual System-board jumpers and switches, System-board jumper blocks, System-board switch block, Switches 1 through