HSC Science (Computer Science)
Academic Year: 2018-2019
Date & Time: 19th March 2019, 11:00 am
Duration: 3h
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(1) All questions are compulsory.
_____ bits of flag register of 8085 Microprocessor are unused.
1
2
3
4
Chapter:
The first bype of an 8085 instruction always contains_________
Opcode
Data
Address
None of these
Chapter:
The 8051 Micro-controller has instruction set of _______ instructions.
101
110
99
111
Chapter:
________ of the following is an example of wireless media.
Optic Fibre
Microwave
UTP
STP
Chapter:
Explain the functions of following pins of 8085 Micro Processor:
IO/M
Chapter:
Explain the functions of following pins of 8085 Micro Processor:
RD.
Chapter:
Explain the functions of the following pin of 8085 Micro Processor:
`bar("INTA")`
Chapter:
State any six features of 8051 Microcontroller.
Chapter:
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Explain the following instructions of 8085 Microprocessor with one
example of each : INX rp
Chapter:
Explain Micro-controller and state any two of its advantages over Micro-processor.
Chapter:
Draw a neat and labelled block diagram of Micro-computer.
Chapter:
Write the functions of following blocks of 8085 Micro-processor:
Accumulator
Chapter:
Write the functions of following blocks of 8085 Micro-processor:
Instruction Register
Chapter:
Write a function of following functional units of 8085 Microprocessor : Instruction Decoder
Chapter:
Given any two instructions of following addressing mode:
Immediate
Chapter:
Given any two instructions of following addressing mode:
Register Indirect
Chapter:
Given any two instructions of following addressing mode:
Register
Chapter:
What is a Protocol ? Explain the concept of TCP/IP Protocol.
Chapter:
Explain following network device with diagram:
Router
Chapter:
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Explain following network device with diagram:
Repeater
Chapter:
Explain memory register map of 8051 Micro-controller with diagram.
Chapter:
State the different hardware interrupts with their priorities and branching addresses.
Chapter:
Explain ALU of 8085 Micro-processor with suitable diagram.
Chapter:
Explain in short six characteritics of Transmission Media.
Chapter:
The accumulator contains AA H and register C contains 55 H. What will be the contents of accumulator if following instructions are executed independently?
i) CMP C
ii) ANA C
iii) ORA C
iv) SUB C
Chapter:
Compare any four features of 80486 and Pentium Processors.
Chapter:
Write an Assembly Language Program to find absolute difference of two hex numbers stored in memory locations 5000H and 5001H. Store the result at 5002 H.
Chapter:
Write an Assemhly Language Program to find largest number in a block of memory starting from 7000 H. The length of the block is stored at 6FFF H. Store the result at the end of the block.
Chapter:
Study the following program and answer the questions given below :
| Label | Mnemonics /Operand |
| BACK | MVIC,08H |
| LXIH,6000H | |
| MOVA,M | |
| RRC | |
| DCRC | |
| JNZBACK | |
| INXH | |
| MOVM,A | |
| HLT |
i) Write the purpoe of the program.
ii) Write comments for the instructions used in the program.
iii) If the input data at memory location 6000 H is FF H, then write the result along with corresponding memory location.
Chapter:
A block of data is stored in memory locations starting from 3001 H. The length of the block is at 3000 H. Write an Assembly Language Program that searches for the first occurrence of data AO H in given block. Store the address of this occurrence in H-L pair. If the number is not fou nd then H-L pair should contain 0000 H.
Chapter:
Write an Assembly Language Program to find the sum of ten hex numbers stored in consecutive memory locations starting from 4000 II. Store the two-byte result at the end of the block beginning with a lower byte.
Chapter:
Study the following program and answer the questions given below :
| Label | Mnemonics /Operand |
| BACK | LXIH,COOOH |
| MOVC,M | |
| INXH | |
| MOVA,M | |
| XRAA | |
| MOV M,A | |
| DCR C | |
| JNZBACK | |
| HLT |
i) Write the purpose of the program.
ii) Write comments for the instructions used in the program.
iii) If the input data at memory location COOO H is 05 H, then write the result along with corresponding memory locations.
Chapter:
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