Memory is an integral part of a microcomputer system. A microprocessor needs to access memory to read instruction codes and data, and it communicates with memory using defined signal lines to write and read data. An interfacing circuit matches the memory's requirements to the microprocessor's signal specifications.

2. Memory is an integral part of a microcomputer
system.
Microprocessor needs to access memory to read
the datas and instruction codes.
Memory and microprocessor has
certain set of signal to write into and
read datas.
Interfacing circuit will match the memory
requirements and the microprocessor signal.

5. a) It has 4096 register.
b) Each register can store 8
bits.
b) Each register can store 16
bits.
c) The chip has 11 address
lines, A10-A0.
c) The chip has 12 address
lines,A11-A0.
d) One chip select(CS), two
control lines.
d) One chip select(CS), one read
control Signal.
e) Read to enable the output
buffer and Write to enable the
input buffer.
e) The chip must be
programmed before it can be
used as a read only memory.
a) It has 2048 register.

8. Clk
A15-A8 Memory Address
----- ------------AD7-AD0
IO/M
RD
MEMR
AD7-AD0 DATA
_
_
_

9. 8085 places 16-bit address on the address bus.
A15 – A8 contains the MSB of the address and
it remains as memory address.
AD7– AD0 contains the LSB of
address until the 1st T state.
IO/M is always low, because it involved
only in memory operation.
The data from memory is transferred to
microprocessor only when RD is low.

11. Clk
A15-A8 Memory Address
AD7-AD0
IO/M
WR
MEMR
AD7-AD0 DATA
T1 T2 T3
_
_

12. 8085 places 16-bit address on the address bus.
A15 – A8 contains the MSB of the address and
it remains as memory address.
AD7– AD0 contains the LSB of
address until the 1st T state.
IO/M is always low, because it involved
only in memory operation.
The data from microprocessor is
transferred to memory only when WR is
low.