Question

Q2- Interfacing an 8255 chip with 8086 Microprocessor to work as an I/O ports which is shown in the figure below. Initialize port A as Input port, Port B as Output port and Port C UPPER as O/P port. Control word register address should be 00FE h ,PPI A$_0$ is connected to 8086 Microprocessor A$_1$, PPI A$_1$ is connected to 8086 Microprocessor A$_2$ Write one tiny model assemble program to do the following: (50 MARK) 1-Display in the Port C UPPER the total Number of Switches which Turn ON (Pressed by the user) out of 8 Switches. 2-By using subroutine with name SW_Pressed, use INT21h/Ah=2 to print "SW is Pressed" to the console every time a Switch pressed by the user where Each Printing operation should be at the beginning of New line on the console. 3- Read the 8-bit data from Port A (switches status) and display the status on 8 bit LEDs on Port B.

          Q2- Interfacing an 8255 chip with 8086 Microprocessor to work as an
I/O ports which is shown in the figure below. Initialize port A as Input
port, Port B as Output port and Port C UPPER as O/P port. Control word
register address should be 00FE h ,PPI A$_0$ is connected to 8086
Microprocessor A$_1$, PPI A$_1$ is connected to 8086 Microprocessor A$_2$
Write one tiny model assemble program to do the following: (50 MARK)
1-Display in the Port C UPPER the total Number of Switches which Turn
ON (Pressed by the user) out of 8 Switches.
2-By using subroutine with name SW_Pressed, use INT21h/Ah=2 to
print "SW is Pressed" to the console every time a Switch pressed by the
user where Each Printing operation should be at the beginning of New
line on the console.
3- Read the 8-bit data from Port A (switches status) and display the
status on 8 bit LEDs on Port B.

Q2- Interfacing an 8255 chip with 8086 Microprocessor to work as an
I/O ports which is shown in the figure below. Initialize port A as Input
port, Port B as Output port and Port C UPPER as O/P port. Control word
register address should be 00FE h ,PPI A0 is connected to 8086
Microprocessor A1, PPI A1 is connected to 8086 Microprocessor A2
Write one tiny model assemble program to do the following: (50 MARK)
1-Display in the Port C UPPER the total Number of Switches which Turn
ON (Pressed by the user) out of 8 Switches.
2-By using subroutine with name SWPressed, use INT21h/Ah=2 to
print "SW is Pressed" to the console every time a Switch pressed by the
user where Each Printing operation should be at the beginning of New
line on the console.
3- Read the 8-bit data from Port A (switches status) and display the
status on 8 bit LEDs on Port B.

Added by George E.

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