Intel MCS48 User Manual page 22

INTRODUCTION
8049
8155
8049
8155
835b
8048
8155
(38) (38)
8048
8355
8155
(53) (53)
8049 8049
8355
8048
(24)
(24)
8048
8355
(28)
(28)
IK
2K
3K
PROGRAM MEMORY
(ROM)
( )
NUMBER
OF AVAILABLE
I/O
LINES
THE EXPANDED
MCS-48™ SYSTEM
The
chart
above shows
the
expansion
possibilities
using the
8048 and 8049
in
various
combinations
with the
Intel®
8355/
8755
Program
Memory
and
I/O
Expander
and
the
8155 Data
Memory
and
I/O
Expander. Data
Memory
can be
expanded
beyond
the resident
words
in
blocks
of
256
by adding
8155's.
Program
Memory
can be
expanded beyond
the resident
1K
or
2K
in
blocks
of
2K
by
using the
8355/8755
in
com-
bination with the
8048
or 8049.
If
all
external
memory
is
desired, the
8035
or
8039 can be
substituted
for
the
8048 and
8049.
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