What is the difference between the following instructions, and identifying their respective addressing modes? A) MOV CX, 437AH and MOV CX, [437AH] B) MOV BL, 437AH and MOV BL, DS:BYTE PTR[437AH]

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Social Studies

Duncan Haynes

19 February, 01:57

What is the difference between the following instructions, and identifying their respective addressing modes? A) MOV CX, 437AH and MOV CX, [437AH] B) MOV BL, 437AH and MOV BL, DS:BYTE PTR[437AH]

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Answers (1)

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Timothy Hunt · Answer 1

Explanation: MOV instruction copies a word or byte from a specified source to a specified destination. The destination can be a register or a memory location. The source can be a register or a memory location or an immediate number.

For MOV CX 037AH: put immediate number 037AH to CX

For MOV BL, (437AH) : copy byte in Ds at offset 437AH to BL

For MOV AX BX : copy content register BX to AX

For MOV DL, (BX) : copy byte from memory at (BX) to DL

That identifies the differences. Good luck.