Explain the difference between the status check I/O and Interrupt I/O in case of 8255 A for Input in Mode 1?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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6 please in 8085

2. (a) Explain why the number of output ports in the peripheral mapped
1/0 is restricted to 256 ports.
(b) Can an input and output port have the same address? If yes, how
can they be distinguished?
3. Define Instruction cycle, Machine cycle and T-state. Identify the
machine cycles in the instruction IN 01H and draw the timing diagram
for the same.
1
4. (a) What is instruction byte queue? What is its advantage?
(b) Explain the concept of memory segmentation. How is the address
of the locations of program bytes generated?
5. Define Interrupt. Distinguish between vectored interrupts and non-
vectored interrupts. Explain the function of SIM and RIM.
6. Explain the difference between the status check I/O and Interrupt I/O
in case of 8255 A for Input in Mode 1?
7. A set of 10 signed data bytes is available in memory starting at 3050H.
Write a program to identify the negative numbers. The positive
numbers are to be rejected and the negative numbers are to be
converted to BCD. The codes for displaying decimal digits using a
seven segment display are available in a look-up table in memory
starting at 3090H. Use this look-up table to display the BCD numbers
obtained after converting the negative numbers to BCD. The digits
are to be displayed on seven segment displays connected to ports
with addresses 01H, 02H and 03H.
Transcribed Image Text:2. (a) Explain why the number of output ports in the peripheral mapped 1/0 is restricted to 256 ports. (b) Can an input and output port have the same address? If yes, how can they be distinguished? 3. Define Instruction cycle, Machine cycle and T-state. Identify the machine cycles in the instruction IN 01H and draw the timing diagram for the same. 1 4. (a) What is instruction byte queue? What is its advantage? (b) Explain the concept of memory segmentation. How is the address of the locations of program bytes generated? 5. Define Interrupt. Distinguish between vectored interrupts and non- vectored interrupts. Explain the function of SIM and RIM. 6. Explain the difference between the status check I/O and Interrupt I/O in case of 8255 A for Input in Mode 1? 7. A set of 10 signed data bytes is available in memory starting at 3050H. Write a program to identify the negative numbers. The positive numbers are to be rejected and the negative numbers are to be converted to BCD. The codes for displaying decimal digits using a seven segment display are available in a look-up table in memory starting at 3090H. Use this look-up table to display the BCD numbers obtained after converting the negative numbers to BCD. The digits are to be displayed on seven segment displays connected to ports with addresses 01H, 02H and 03H.
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