System information

APPENDIX
Memory Maps B-503
B
Memory Maps
This appendix presents memory maps for selected product platforms, processors, and interface
cards. Memory map information is useful for technically qualified users who understand concepts
of low-level operating systems, bus structures, and address mapping in computer systems.
When using this appendix, be aware of the distinct difference between program counter values and
operand addresses. The addresses that appear in this appendix are operand values and should not be
confused with program counter values.
Note All memory addresses are in hexadecimal, unless otherwise noted.
Memory Maps and Troubleshooting
Memory map information can be useful when you are determining whether a problem exists in the
software or in the hardware. The system software can provide information about the reasons for a
system crash. This information appears in the form of error messages issued by the ROM monitor
when an exception is encountered.
Failure Types
When a system crashes, the ROM monitor reports a failure type. The failure type is important both
in its own right and as a guide to interpreting the other information the system provides. Failure types
are usually one of the following:
• Bus error
• Address error
• Watchdog timeout
• Parity error
• Emulator trap