Compaq AlphaPC 264DP Technical Reference Manual page 27

2.2.1 Fail-Safe Booter
The Fail-Safe Booter (FSB) utility provides an emergency recovery mechanism
when the primary firmware image contained in flash memory has been corrupted.
When flash memory has been corrupted, and no image can be loaded safely from the
flash ROM, you can run the FSB and boot another image from a diskette that is
capable of reprogramming the flash ROM.
2.2.2 Memory Timing
The memory bus timing is controlled by switches 2 and 3 of SW2 on the mainboard
(see Figure 2–3). Both switches are off by default, and they must be kept off.
2.2.3 Mini-Debugger
The Alpha SROM Mini-Debugger is stored in the flash ROM and is enabled/
disabled by switch 4 of SW2 on the mainboard (see Figure 2–3). The default position
for this switch is off. When this switch is on, it causes the SROM initialization to trap
to the Mini-Debugger after all initialization is complete, but before starting the
execution of the system flash ROM code.
2.2.4 Password Bypass
AlphaBIOS provides password protection. However, if the use of passwords has
been enabled and you have forgotten the current password, password bypass is pro-
vided through the use of switch 8 (pby) of SW2 on the mainboard.
Normal operation, with switch 8 in the off position (see Figure 2–3), requires a
password. The password bypass function is enabled by setting the switch to the on
position. This disables the AlphaBIOS password verification and enables the user to
set up or start up their system without the AlphaBIOS password. Password bypass
also clears the password.
After this function has been enabled, to disable it and require a password, set switch
8 to the off position.
12 February 1999 – Subject To Change
AlphaPC 264DP Mainboard Configuration Switches
System Configuration and Connectors
2–7