TRIBHUVAN UNIVERSITY
INSTITUTE OF SCIENCE AND TECHNOLOGY
2081 B.S.
Candidates are required to give their answers in their own words as far as practicable.
Group A
Long Answer QuestionsAttempt any Two questions.
- 1Explain the internal architecture of 8085 microprocessor with well labeled block diagram.
- 2What is ALE signal? Draw a timing diagram for LDA 5000H instruction and explain the machine cycles involved.
- 3Explain LHLD and SHLD instruction. Ten 8-bit data are stored at memory location starting from 6000H. Write an assembly program for 8085 microprocessor to calculate the sum of this data array and store the sum and carry starting from 9500H.
Group B
Short Answer QuestionsAttempt any Eight questions.
- 4Explain about memory segments and segment registers in 8086 microprocessor.
- 5Write an ALP to convert the string "computer science" to uppercase using 16 bit microprocessor.
- 6Explain different types of IO instructions. Differentiate between I/O mapped I/O and memory mapped I/O.
- 7What do you mean by vectored interrupt? Explain maskable and non-maskable interrupts in 8085 microprocessor.
- 8Explain different addressing modes in 8085 microprocessor.
- 9Explain register organization in 80386 microprocessor.
- 10List out the limitation of parallel communication. Explain the different operation modes of 8255A PPI.
- 11What is Descriptor? Explain the use of Segment descriptors in physical address conversion in 80286 microprocessor.
- 12Write short notes on (any two):\na. Flags in 8085 MPU\nb. DMA