User`s guide
vector
ZCB
Single
Board Ccmputer
2.3.6
Phantom
enable/disable
Jumper
area:
C
Connections
as
manufactured:
jl.lIl'p:red.
Function:
Allows
generation
of
phantan
on
5-100 bus
line
67.
When
enabled,
phantom
disables
other
system
rrem:>r.y
toards.
This
is
useful
when
you
want
to
jump
to
a
particular
EPRCM
on
system
};X)Wer
on/reset.
Qptions:
to
disable
the
generation
of
the
phantan
signal
cut
jumper
between
both
pads
of
jumper
area
C.
2.3.7
Jumper
areas
K,
L
am
M
'!hese
jumper
areas
have
been
included
for
future
expansion.
The
standard
jumpers
will
accomodate
all
three
types
of
EPROMs
(2708,
2716,
2732)
currently
in
use.
2.4.0
I/O
SECl'IOO
2.4.1
I/O
Port
Addressing
The
ZCB
supports
all
256
port
addresses
possible
with
the
Z-80
CPU.
However,
the
choice
of
serial
and
parallel
:£X)rt
addresses
must
be made
from
predefined
groups
of
32
addresses
each.
This
is
done
by
changing
the
jumpers
in
one
or
two
jumper
areas
if
addresses
other
than
the
factory
chosen
standard
are
desired.
The
port
addresses
for
the
one
serial
and
three
parallel
ports
are
selected
in
such
a manner
as
to
coordinate
with
software
that
is
being
used.
The
hardwired
jumpers
on
the
I/O
section
of
the
ZCB
board
must
match
those
specified
in
software.
For
this
reason,
the
preconfigured
:£X)rt
addresses,
that
is,
those
addresses
already
set
at
the
Vector
Graphic
plant,
match
the
:£X)rt
addresses
called
for
in
our
standard
software.
Four
:£X)rt
addresses
are
reserved
for
the
one
serial
port.
The
serial
port
addresses
are
preset
for
data
04H
(echoed
on
06H)
and
control
05H
(echoed
on
7H.)
The
second
pair
of
data
and
control
:£X)rts
simply
duplicate
the
information
on
the
first
pair.
Four
:£X)rt
addresses
are
also
used
for
the
three
parallel
:£X)rts. They
are
designated
Ports
A (08H), B (09H) and C
(OAR)
while
the
fourth
port
address
designates
the
control
:£X)rt
or
Control
Status
Register
(OBH.)
They
can
be
configured
as
three
8-bit
input
or
output
ports
or
t'YKJ
8-bit
and two
4-bit
input
or
output
:£X)rts.
Setting
the
addresses
for
the
serial
and
parall~l
t;:Orts
first
involves
Rev.
I-B
6/11/80
2-7