Specifications
Multi
Slave
Product
Reference
Hanual
Section
1
GENERAL
NOTES
The
Multi
Slave
contains
three
independent
2i109
280-H
CPUs.
The
principal
110
device
£or
each
processor
is
the
Signetics
2681
DUART
<Dual
Universal
Asynchronous
Receiver/Transaitter).
This
particular
device
was
cnosen
£or
its
many
i'eatures,
which
include
an
internal
duel
baud
rate
generator
and
counter/tiaer.
Several
types
of
PROMs
are
supported
by
the
Hulti
Slave,
based
on
Jumper
options.
The
PROM
types
supported
are
a8
%ollowa:
2716,
2732,
2764,
27128
~nd
27256.
PROM
addressing
begins
at
OOOOH.
Each
processor
contains
a
total
0%
128k
o£
user
available
.eMory,
configured
as
two
64k
banks,
and
is
selectable
through
ao£tware.
There
is
only
one
interrupt
source
on
the
Multi
Slave,
which
i8
provided
by
the
DUART.
Typically,
the
280
CPU
will
be
operated
using
Mode
1
interrupts
(see
the
2ilog
ZBO
Technical
Hanual
£or
a
discussion
o£
280
interrupt
modes>.
Each
slave
is
also
capable
o£
interrupting
the
master
via
the
S-
100
vectored
interrupt
lines.
This
will
be
discussed
in
detail
later.
Each
280
CPU
is
driven
by
a
cent!al
8
MHz
oscillator;
the
three
DUARTs
are
driven
by
a
COMmon
3.6864
MHz
crystal.
GENERAL NOTES
Page
1-7