The
following
table
allows you to configure
the
required
RAM
size:
Bank
0
Bank
1
Bank
2
Bank
3
256K
RAM
41256
X
9
Nocmps Nochms
No
chips
512K
RAM
41256
X
9
41256
X
9
Nochms Nocmps
576K
RAM
41256x9
41256
X
9
4464x2
+4164x1
Nocmps
640K
RAM
41256
X
9 41256
X
9
4464X2
+4164X1
4464X2
+4164X1
Note that
for
the 576K
RAM
and
the
640K
RAM
options,
two different kinds
of
chips
are used
in
banks
2
and
3.
For
576K
RAM,
bank
2
will
be
filled with
two
4464 chips
in
sockets
U63
and
U59,
and one
4164 chip
in
socket
U55.
For 640K
RAM,
bank
2
will
be
filled with
the
same
chips
as
were
used
for 576K
RAM
and bank
3
will
be
filled with
two
4464 chips
in
sockets
U72
and
U67,
and
one 4164 chip
in
U76.
ROM
installation
Two
chips must be installed
for
the
ROM of
this
system:
a
2764
in
socket
U38 for
the
ROM
BIOS and
a
27256 chip
in
socket
U49 for
the
ROM BASIC.
Refer
to
the
illustration
below
for
the
location
of
these
two
sockets.
U49
U38
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