Specifications

Theory of Operation
4 4
4-3
Processor board
The EPC-8 processor board conforms with the VMEbus standard 6U form-factor.
Processor and Coprocessor
There are two processor options for the EPC-8. There may be an Intel486 DX2 (32-
bit bus interface) running at 50 MHz, or an Intel486 DX2 running at 66 MHz.
The 50 MHz DX2 and 66 MHz DX2 each have a built-in math coprocessor.
Memory
The following memory options are supported: 4 Mbytes, 8 Mbytes, and 16 Mbytes.
One SIMM socket is available. See Appendix D, Memory for memory upgrade
instructions.
Memory Map
The 2
32
byte physical address space seen by the Intel486 occupies three areas:
1. Addresses between 0 and 1 Mbytes, which are largely defined by the
IBM PC/AT architecture.
2. Addresses between 1 Mbytes and 256 Mbytes, which largely depend on
how much DRAM is installed in the EPC-8.
3. Addresses above 256 Mbytes, which provide direct mapping to the
VMEbus with a variety of address modifiers and byte orderings. See
Chapter 5, Programming Interface for more information about this
feature.
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