North South University CSE 331 Microprocessor Interfacing and Embedded Systems. Q&A

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CSE 331L / EEE 332L: Microprocessor Interfacing & Embedded System Section: 7, Spring 2021 Quiz - 02 Marks: 10 Time: 30 mins

Name:

Taufiqur Rahman Anik

ID:

1711474042

Q1: Why is the DOS function 4CH used?

(1)

Ans 1: Exit Function

Q2: Suppose, CX register holds the data 000AH, What should be the instruction/s for multiplying the data in CX by 16 using shift operations? What should be the data in CX after the multiplication?

(2+1) Ans 3: .MODEL SMALL .STACK 100H .CODE MOV CX, 000AH BL – SHL CX,4 EXIT: MOV AH, 4CH INT21H

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Answer Q3 based on the following program.

The following program tries to find out which unsigned number is greater (79H or 80H). But there are some errors in it:

Q4: Find how many errors there are in the given code, and write the corrected instructions.

(3+3) Ans 4: Number of errors- 3 Correct Version of Code: INCLUDE EMU8086.INC .MODEL SMALL .STACK 100H .CODE

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MOV AL, 79H MOV BH, 80H CMP AL,BH JG PRINT PRINT "79H IS GREATER THAN 80H" JMP EXIT PRINT: PRINT "79H IS LESS THAN 80H" EXIT: MOV AH, 4CH INT 21H

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