RadiSys EPC-5A, Hardware & Software Reference Manual

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5. Theory of Operation
The EPC-5A is a PC/AT compatible processor. Most of the standard functions of the
PC architecture is embodied in the RadiSys R400 chip set. In addition, the EPC-5A
has two proprietary interfaces: one for the EXM expansion interface and the other for
the VMEbus.
Processor board
The EPC-5A processor board conforms with the VMEbus standard 6U form-factor.
Processor and Coprocessor
The processor in the EPC-5A is an Intel486-DX4 running internally at 100 MHz with
an external interface at 33 MHz.
The 486 has a built-in math coprocessor and 16K cache.
Core Logic
The system uses the RadiSys R400EX system controller. The R400EX was developed
by RadiSys to provide flexibility (of different system designs), ease of use, and low
system cost. It is intended as a long-life core logic solution for the 486.