Specifications

EPC-8 Hardware Reference
4 4
4-10
RS-422/485 Port
The modified RS-422/RS-485 port is normally configured as COM2 (I/O address =
2F8-2FF, IRQ3). This port is also a standard PC COM port based on the 16450
architecture. If not needed, COM2 can be disabled in the setup screen to free up the
I/O address and interrupt for usage by other expansion products. The RXD and TXD
signals are RS422 compatible with differential receiver and driver, respectively.
Handshake signals RTS, DTR, CTS and DSR are single-ended RS422 compatible.
Outputs TXD+ and TXD- are tristated if RTS is unasserted for RS485 multidrop
compatibility. The port has 10K ohm termination.
Parallel Port
The printer port is a standard PC printer port. The parallel port supports bi-directional
communication compatible with the PS/2 definition. It is configured as LPT1 (I/O
address 378-37F, IRQ7). If not needed, LPT1 can be disabled in the setup screen to
free up the I/O address and interrupt for usage by other expansion products.
Keyboard
The keyboard controller is integrated into the VLSI PC chip set. It can interface to
most standard PC keyboards with a PS/2-style connector. An adapter cable is shipped
with the EPC-8 to allow use of standard PC/AT keyboards with larger 5-pin
connectors.
Front Panel LEDs
The EPC-8 has three LEDs in the top left corner of the front panel. These LEDs are
described below:
RUN This LED is lit whenever a write access to DRAM is made. This
provides a normally lit LED indicating that the CPU is operating.
This LED is not lit if the CPU is halted or is executing entirely out
of the on-chip cache.
FAIL This LED is lit whenever the VME SYSFAIL line is asserted if the
EPC-8 is jumpered to be the Slot-1 controller. This occurs
independent of which VME board is driving the SYSFAIL line. It
comes on whenever the system receives a hardware reset and
remains on until the initial power-on self-tests have completed.
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