Technical information
TECHNICAL INFORMATION
Expansion Board Card-Edge Signals
If
you
install an expansion board in
the
Expansion Compartment,
this Card-Edge will give
you
easy access
to
the
added board.
For
example, with
the
Radio Shack RS-232C Serial Interface installed,
you
will connect
your
external RS-232C equipment
to
this Card-
Edge.
The
Card-Edge is connected
to
the Connector inside
the
Expansion
Compartment, and also
to
certain TRS-80 signals:
TRS-80 Data Lines (D0 - D7); some
of
the TRS-80 Address Lines
(A0 - A2); the I/O strobes (IN* and OUT*); the reset line SYSRES*;
+5 volts; ground;
the
interrupt
line INT* and a decoded signal called
E8*. E8* goes
to
a logical
"0"
when-A3, AS, A6 and A7 are logical •
"1"
and A4
is
logical
"0".
The Card-Edge itself
is
not
connected
to
any
of
the
TRS-80 signals.
Your
Expansion Board must supply any signals
your
external
equipment will require. See
the
Schematic Diagram for further
details.
The following table shows the Card-Edge pinouts with
the
optional
RS-232C Interface board installed.
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