Specifications

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EPC-30 Hardware Reference
Page 43
allow topside mounting of PC/104 cards. Four 0.125” holes are
present in the PCB at standard PC/104 locations.
The ISA-bus signals are provided by the R380EX devices. External
buffers are used to interface the R380 to all of the external ISA bus
devices and the ISA connectors. The buffer strengths, Iol and Ioh,
on the bus are 24 mA or greater.
The clock speed of the ISA-bus is a function of the divide ratio
programmed in the R380EX and is set to approximately 8 MHz.