INTRODUCTION
384
8049 8049
8155 8155
835&
320
8048 8048
8155 8355
8155
128 (38) (38) (53) (S3)
8049 8049
8355
64
8048 8048
8355
(24) (24) (28) (28)
1K
2K
3K
4K
PROGRAM MEMORY (ROM)
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
1-4
( ) NUMBER
OF
AVAILABLE
1/0 LINES
by adding 8155's. Program Memory can
be
expanded beyond the resident 1 K 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.