Specifications

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EPC-30 Hardware Reference
Page 46
Power requirements
In most applications, the EPC-30 operates on 5V DC power only. The
voltage supplied must be between 4.75 volts and 5.25 volts. +12V must be
supplied to erase or program non-Smart voltage FLASH devices, including
the BIOS, if 5V-only components are not installed on the board. The +12V
supply from the power input connector is connected to the ISA and PC/104
connectors.
Normally, -5V is also supplied by the PC power supply, but it is only
connected to the ISA and PC/104 connectors, and is seldom used by any
board. This design does not make provisions for sourcing or connecting to
the -5V supply.
The last two letters in Flash chip part numbers identify smart-voltage and
non-smart-voltage parts. For example, the 28F016SV is a smart-voltage chip
that can use 5V or 12V. the 28F016SA requires 12V to program.
The current consumption of the EPC-30 is 1.3 amps or less (1 amp typical)
in 5V mode, using a 33MHz Intel386 EX C-step processor, with a base
memory configuration of 4 MB, in an idle state (DOS prompt).
This current draw does not include current drawn for the keyboard, or any
daughter cards that might be installed on the ISA-bus or PC/104 sockets.
3.3V Operation
Circuitry is included on the EPC-30 board for a 5V to 3.3V linear voltage
regulator. Some of the passive components are populated, but the converter
is not populated. In order to run 3.3V PCMCIA cards, the regulator needs to
be installed and other changes must be made.