18 Pamux User’s Guide
UCA4 UNIVERSAL COMMUNICATION ADAPTER
The UCA4 is a general-purpose adapter card used to connect any TTL device to the Pamux bus. Its
purpose is to allow a user to build a custom interface to a Pamux system. For example, the UCA4 can
be used to connect Pamux to a PDP-11, an Intel single-board computer, or any other device with a
parallel I/O interface.
The UCA4 features terminators, bus drivers, a 50-pin header connector used to interface with the Pamux
bus, and two 50-pin male connectors used to link with a TTL device. Because the incoming pins on the
UCA4 are not defined, users can wire-wrap their own custom TTL logic on the board (a wiring schematic
is provided). In addition, on-board SIP sockets allow users to incorporate additional logic circuity directly
on the board. All active parts are socketed to simplify replacement.
Figure 1-9: UCA4 Universal Communication Adapter
INTRODUCTION
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