User`s guide
Vector
ZCB
Single
Board
emrputer
handshaking
line.
'lbere
is
one
spare
RS-232C
recelve~r-arid
one
spare
RS=-232C
driver
available
qn
the
board
which
can
be
used
to
connect
one
input
and
one
output
handshaking
line.
For
the
large
majority
of
applications,
no
additional
RS-232C
lines
will
be
required
other
than
those
already
conriected
to
active
canponents
on
the
ZCB
board.
'lbus
the
serial
ports
can
very
often
be
used
as
DCE
RS-232C
input/output
ports
without
modification.
Most
serial
printers,
and
terminals,
can
be
connected
with
little
or
00
difficulty.
.
.
To
connect
to
a modem,
acoustic
coupler,
or
other
kind
of
Data
Communications Equipment, a
serial
port
must
be
converted
into
a
DTE
RS-232C
port.
'lbis
can
either
be
done
by
changing
the
board
wiring
slightly
or
by
attaching
a
Null
Modem
Cable
to
the
external
DB-25, which
accanplishes
the
same
thing.
However,
if
RS-232C
handshaking
is
required,
other
than
the
lines
already
connected,
then
additional
m.xlifications
to
the
board
will
be
necessary
as
explained
in
Section
2.4.5.
Of
course,
software
is
necessary
in
order
to
operate
specific
devices
connected
to
the
serial
port.
Section
2.4
gives
the
standard
I/O
port
addresses
and
instructs
you
how
to
change them
as
necessary.
other
documents
fram
Vector
Graphic
describe
the
particular
I/O
addresses
and
peripheral
devices
which
each
Vector
Grartlic
software
product
controls.
For
example,
at
the
time
of
this
writing,
any
Extended
Systems
Monitor
having
option
C
enables
a
standard
serial
terminal
to
be
plugged
directly
into
the
serial.
The
Version
4
Extended
Systems
Monitor
(any
option)
contains
a program
that
enables
the
operator
to
communicate
to
a
time
share
service
via
a
m.xlem
connected
via
an
RS-232C
cable
to
the
serial
port
which
has
to
be
converted
to
a
DTE
p:Jrt
first.
Iastly,
operating
systems
such
as
MDOS
and
CP/M
fram
Vector
Graphic,
and
Vector
Graphic's
Word Managagment
System,
ootput
to
printers
via
the
serial
port.
1.5.6
Parallel
Ports
The
ZCB
has
three
independent
parallel
input
or
ootput
ports,
called
Parallel
Ports
A, B
and
C. 'lbey
are
connected
to
the
ootside
\t,1Qrld
via
one·
34-pin
connector
which
is
l'I'Olll1ted
on
the
tcp
of
the
card.
Vector
Graphic
supplies
an
optional
34-line
ribbon
cable
that
connects
to
this
edge
connector.
The
other
end
of
this
cable
has
no
connector
on
it,
allowing
you
to
configure
it
as
desired.
Many
of
the
34
lines
are
oot
used,
as
discussed
below.
Each
parallel
port
has
eight
pins
which
can
be
programmed
for
input,
output
or,
in
the
case
of
Port
C,
control.
16
different
combinations
are
possible
in
~e
0,
roc>re
are
available
in
~s
1
and
2.
See
Intel's
8080
Microcomputer
Systems
User's
Manual
for
roc>re
information
on
Modes
1 and
2.
Additional
pins
provide
+5
VOC
and
GND.
Exact
pin
assigrnrents
are
given
in
Table
12·
in
Section
2.8.
Input
and
output
is
accomplished
using
IN{put)
and
OUT{put)
machine
1-6
Rev.
I-B
6/11/80