Service manual

Power-Up 2-5

the XBUS. Sector 2 of FEPROM 0 contains a duplicate copy of the code and is used

if sector 0 is bad.

FEPROM. Two 1-Mbyte programmable ROMs are on the XBUS on PCI0.

FEPROM 0 contains two copies of the XSROM, the OpenVMS and DIGITAL UNIX

PALcode, and the SRM console and decompression code. FEPROM 1 contains the

AlphaBIOS and NT HALcode. See Figure 2-3. These two FEPROMs can be flash

updated. Refer to Appendix A.

Figure 2-3 Contents of FEPROMs

FEPROM 0 FEPROM 1

XSROM

and

Fail Safe ldr

XSROM

and

Fail Safe ldr

Pal

Code

AlphaBIOS

Code

Decompress

SRM

Console

Code

Sector

64Kb

1Mbyte

PKW0431D-96