User`s guide
Vector
ZCB
Single
Board
canputer
dynamic IreIl'Ories,
such
as
Vector
Graphic's
64K
IreIl'Ot:y
board.
Simplicity
of
design
has
been
stressed
to
enhance
reliability
of
operation
by
the
use
of
MSI
aoo
ISI
integrated
circuits.
1.4
P.RG1,!RAM
section
The
PROM/RAM
section
features
lK
of
on-board
RAM
mem::>t:y
(using
2114's)
aoo up
to
12K
of
PRCM,
RCM
or
EPRCM.
Note:
For
the
purposes
of
discussion
in
this
manual,
the
terms
PROM,
EPR.CM
and
RCM
may
be
used
interchangably.
Their
technical
distinction
makes no
difference
in
how
they
are
used
in
the
ZCB.
The
PROM
may
be
implemented
using
either
2708's,
2716's
or
2732's.
This
allows
the
user
maximum
flexibility
with
regard
to
choice
of
operating
systems,
languages,
etc.
Several
jumper
options
such
as
jump
on
y;x:>wer-on/reset
are
available.
Ad.vanced
address
decoding
logic
permits
a
wide
range
of
addressil".K3
options.
1.5
I/O
section
The
I/O
section
of
the
ZCB
single
board
computer
offers
three
8-bit
parallel
FOrts
or
FOrts
progra:mrnable
as
input
or
output
and
one
RS-232C
level
serial
port
for
interfacil".K3
with
multiple
perpheral
devices
such
as
printers,
rrodems
am
terminals.
The
CPU
sends
data
to
the
serial
and
parallel
FOrts
via
I/O
addresses.
The
I/O
addresses
used
by
the
board can
be
changed
as
a
group.
The
board
uses
eight
I/O
addresses
from
OOH
to
FFH.
You
specify
the
value
of
the
addresses
by
jumper(s),
as
listed
in
Section
2.4.1.
Thus,
the
entire
range
of
256
possible
port
addresses
may
be
accessed
with
the
advanced
decoding
logic
built
into
the
Vector
Graphic
ZCB.
The
ZCB
Board
does
not
came
with
any
software
for
specific
applications,
though
Vector
Graphic
supplies
certain
items
of
software
that
make
use
of
its
features.
The
Vector
Graphic Extended Systems Monitor
4.0
will
~rk
with
the
board
as
it
cates
fran
the
factot:y
without
any m::x:1ification.
1.5.1
Serial
ports
generally
Discussion
of
the
serial
port
centers
around
the
industt:y
standard
8251
USARI'
(Universal
Synchronous/Asynchronous
Receiver/rransmitter)
chip.
Much
of
the
flexibility
of
the
ZCB
board
derives
fran
the
flexibility
of
this
chip
am
its
parallel
counterpart,
the
8255,
both
of
which
can
be
modified
via
software.
You,
through
software,
can
control
the
rate
of
serial
transmission,
am
the
format
of
the
transmitted
data.
Data
is
transmitted
as
ASCII
code
having
between
5 and 8
bits
per
character,
with
an
optional
added-on
parity
bit
(choice
of
even
or
cdd),
and
wi
th
one
start
bi
t
and
a
choice
of
one,
one
and
a
half,
or
two
stop
bits
per
character.
Further,
usil".K3
the
8251,
the
board
can
handle
either
asynchronous
or
synchronous
conununication.
Baud
rates,
format,
handshaking,
and
whether
cannunication
is
asynchronous
or
synchronous,
is
specified
through
software
and,
in
some
cases,
hardware m::x:1ifications.
1-2
Rev.
l-B
6/11/80