Motorola MVME1603 Installation And Use Manual page 115

MPC604 boards have double-wide front panels to accommodate a heat
sink on the PowerPC604 that protrudes into the adjacent VME slot.
The PM603/PM604 module accommodates additional memory. RAM104
modules of 8, 16, 32, or 64MB DRAM are available for memory
expansion.
A 192MB memory module is available for the PM604 module as a factory-
installed option.
The processor module has sockets for 1MB of Flash memory. The onboard
monitor/debugger, PPCBug, resides in the Flash chips. PPCBug provides:
A boot loader and extensive onboard diagnostics
A single-line assembler/disassembler
The capability to save and restore a configuration through NVRAM
A remote boot capability
Under normal operation, the Flash devices are in "read-only" mode, their
contents are pre-defined, and they are protected against inadvertent writes
due to loss of power conditions. However, for programming purposes,
programming voltage is always supplied to the devices and the Flash
contents may be modified by executing the proper program command
sequence. Refer to the third-party data sheet for further device-specific
information and/or to the PFLASH PPCBug command.
Functional Description
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