HSC Science (Computer Science)
Academic Year: 2025-2026
Date & Time: 10th March 2026, 11:00 am
Duration: 3h
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Instructions:
- All questions are compulsory.
- Figures to the right indicate fill marks.
- Use of any type of calculator not allowed.
- Draw a near diagram whenever necessary.
In Intel 8085 Microprocessor, ALE signal is made high to ______.
enable AD0 − AD7 bus to be used as lower order address bus.
enable A8 − A15 bus to be used as lower order data bus.
to halt the processor
to reset the microprocessor
Chapter:
Which flag not gets affected after execution of INR M?
Carry
Sign
Auxiliary
Parity
Chapter:
The ______ is not a chamcteristic feature of 8051 microcontroller.
4 K byte of internal RAM
4 K byte of internal ROM
4 parallel bi-directional I/O port
full-featured serial port
Chapter:
All the Systems on network must follow a set of common rules, called as ______.
interface
contention
token passing
protocol
Chapter:
Differentiate between Maskable and Non-maskable interrupts. (Any three points)
Chapter:
State any six applications of the Microcontroller.
Chapter:
Write any three atiributes of Pentium Processor.
Chapter:
Write the purpose of the following pin of 8085 Microprocessor:
TRAP
Chapter:
Explain the function of the following pin of 8085:
`"IO|" bar"M"`
Chapter:
Explain the function of the following pin of 8085:
HLDA
Chapter:
Write three primary functions of the CPU of a microcomputer.
Chapter:
State any six features of 8051 Microcontroller.
Chapter:
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Write procedure of DAA instruction to convert hexadecimal number in to Binary Coded Decimal (BCD) number with suitable example.
Chapter:
Draw labelled diagram of programming model for Pentium Processor.
Chapter:
State any three addressing modes of 8085 Microprocessor instructions with one example of each.
Chapter:
Define the following term with a suitable diagram:
T State
Chapter:
Define the following term with a suitable diagram:
Machine Cycle
Chapter:
Define the following term with a suitable diagram:
Instruction Cycle
Chapter:
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Compare the characteristics of Fiber-Optic and Co-axial Cable Mention at least three points.
Chapter:
Explain in short six characteritics of Transmission Media.
Chapter:
Draw labelled diagram of programming model of 8085 Microprocessor.
Chapter:
The Accumulator of 8085 Microprocessor contains data 89 H. The register D contains data 58H. What will be content of Accumulator in hexadecimal after execution of each of the following instruction dependently (Stepwise i.e. one after another):
- ADD D
- DAA
- CMA
- SUI B8H
Chapter:
Write an assembly language program that multiply two 8 bit hex numbers stored in memory locations 9404H and 9405H. Store the two byte result in consecutive memory locations 9606H begining with lower order byte.
Chapter:
A block of daa is stored in memory locations from 8400H. The length of the block is stored in 73FFH. Another block of same length is stored from 8500H. Write an assembly language program to exchange the contents of these two blocks.
Chapter:
Write an assembly Language program to separate nibbles of a number stored in memory location 7503H and store the separated nibbles in memory location 7504H and 7505H.
Chapter:
Two 16 bit numbers are stored in consecutive memory locations begining with lower order byte A200H and B200H respectively. Add these two numbers and store three byte result starting from memory location C200H.
Chapter:
Write an assembly language program to fill the memory block of 16 memory locations staring from C200H with data byte 22H and 33H every alternate memory locations.
Chapter:
Write an assembly language program to find smallest number in block which begins from memory location E200H to E210H. Store the result in the accumulator.
Chapter:
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