PolyMorphic Systems 16K Ram User manual
16K Ram
PolyMorphic
Systems
460 Ward [Jive
Santa
Barbara
Califomia
93111
(805) 967-2351
This
manual
is
PolyMorphic Systems
part
no. 810119.
Copyright 1977, ·
Interactive
Products Corporation.
Card
Revision
C
·C)
'Page
1 16K
RAM
Card
Operation
PolyMorphic
Systems
The
PolyMorphic
Systems
16K
RAM
card
provides
16,384
bytes
of
read/write
storage.
The
card
uses
proven
4K
dynamic
RAM
chips
and
provides
"transparent"
refresh
circuitry
onboard
(no
wait
states).
Each
card
has
been
tested
for
72
hours
before
shipment.
This
includes
48
hours
of
GALPAT
and
checkerboard
testing
at
high
temperatures
with
no
errors.
This
card
should
provide
years
of
trouble-free
service
in
your
8080-based
S-IOO
system.
THEORY
OF
OPERATION
Refresh
cycles
are
i~serted
during
the
T4
state
of
the
Ml
cycle
of
the
8080
central
processor
or
during
a
hold
or
halt
state
of
more
than
15
cycles.
Memory
read
cycles
are
initiated
by
the
coincidence
of
the
phase
1
clock,
PSYNC,
and
007
(MREAD
staus).
Write
cycles
are
initiated
by
the
leading
edge
of
MWRITE.
If
the
card
is
used
with
systems
using
DMA
(Direct
Memory
Access),
the
DMA
controller
must
provide
the
proper
status
bits
on
the
DO
bus
during
SYNC
time.
The
bus
timing
must
match
that
of
an
8080
processor.
Contact
the
manufacturer
or
distributor
of
the
DMA
controller
before
attempting
to
use
the
16K
RAM
card
with
a
DMA
device.
,ADDRESSING
Consult
the
user's
manual
for
your
computer
to
determine
the
correct
address
for
this
memory
card.
For
POLY
88
or
System
88
computers,
the
card
should
be
addressed
just
above
the
present
top
of
memory.
If
your
system
uses
only
16K
cards,
the
first
card
should
be
addressed
at
2000B,
the
second
card
at
6000B,
and
the
third
card
at
AOOOH.
The
16K
RAM
card
may
be
addressed
to
any
4K
boundary
within
the
64K
address
space
of
the
S-IOO
bus
and
will
occupy
the
next
16K
bytes
ofs
.
torage
space.,
(Ifaddr.essed
at
2000B,
the
RAM
will
occupy
2000-5FFFH.)
The
address
switches
are
located
in
the
lower
left
corner
of
the
card.
Up
to
seven
switches
may
be
present,
but
only
the
top
four
are
used.
These
switches
are
numbered
1
through
4
from
the
top
of
the
card.
The
switch
settings
for
various
addresses
ar~
given
below.
Rocker
switches
are
ON
when
the
on
or
plus
side
of
the
rocker
switch
is
pressed
down.
For
purposes
of
reference,
note
the
numbers
down
one
side
of
the
card
and
across
the
top.
These
numbers
indicate
the
ad-
dresses
of
the
memory
chips
within
the
~6K
block.
Numbers
down
the
side
indicate
byte
address:
row
0
on
the
card
is
addressed
in
the
first
4K
of
the
block,
row
1
in
the
next,
and
so
on.
Numbers
across
the
top
correspond
to
the
bits
in
each
byte.
Column
0
contains
the
first
bit
in
every
byte,
column
1
the
second,
etc.
Page
2 16K
RAM
Card
Operation
PolyMorphic
Systems
Switch
Settings
(X=on,
blank=off)
Address
1 2 3 4
0000
1000
X
2000
X
3000
X X
40-00 -X
5000
X X
6000
X X
7000
X X X
8000
X
9000
X X
AOOO
X X
sOOO
X
--
X X
COOO
X X
Dodo
X X X
EOOO
X X X
FOOO
X X X X
If
addressed
higher
than
COOOH,
the
memory
above
FFFFH
will
appear
in
the
lower
end
of
the
address
space.
(If
set
at
EOOO
it
will
appear
at
EOOO-FFFFH
and
OOOO-lFFFH.)
The
RAM
card
may now
be
plugged
into
your
system
backplane.
Consult
the
user's
manual
for
your
computer
for
card
insertion
instructions.
SPECIFICATIONS
-
Memory
Size:
Access
Time:
Cycle
Time:
Wait
States:
Power
Consumption:
Card
Size:
16,384
Bytes
375
nS
(from
01)
525
nS
o
+16
to
20V @
200
rnA
max.
(active)
_ +IEi
to
20V
@
90
rnA
max.
(standby)
+8
to
10V
@
600
rnA
max.
-16
to
20V
@
24
rnA
max.
5.5
n x
Ion
,)
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