IBM 6648 - Manual (Page 163)

A40/A40P Clear CMOS/Flash Boot Block Recovery
Use the recovery jumper setting to Clear CMOS or to Flash Boot Block
Recover.
Jumper Setting Description
CMOS Reset 2-3 CMOS Reset/Flash Recovery Mode
1-2 (D) Normal Mode
Note: The A40/A40P CMOS clear/recovery jumper pins are numbered as
follows:
v Pin 1 is the farthest from the battery.
v Pins 2 and 3 are below pin 1, as seen in the A40/A40P System Board
layout.
A40/A40P Processor Speed Settings
Processor speed for NetVista type 6058/6059/6578/6579 computers is fixed
and is determined by the processor. There are no settings required.
A40/A40P Diskette Write Access
Diskette Write Enable and Write Protect options are changed in the Setup
Configuration. See “Setup Utility program” on page 122.
Chapter 3. Types 6058/6059/6269/6578/6579 149