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Consider you have opened MS Word to write your assignment in File1, you write your name...

Consider you have opened MS Word to write your assignment in File1, you write your name and registration no. and now to copy questions you need to open Question File to copy questions from that file in to File 1. After copying Questions you have started typing answers. After completing the assignment File 1, you wants to print the document for which you need communication service routine as well. Considering the above scenario, is there any interrupts/system calls occurred? If yes, then name those interrupts. Is this an example of nested multiple interrupts? Discuss how?
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Answer #1

Yes, many interrupts were used.

1. To open File1

AH = 3Dh - "OPEN" - OPEN EXISTING FILE

2. You write some stuff

AH=40h - "WRITE" - WRITE TO FILE OR DEVICE

3. Open questions file

AH = 3Dh - "OPEN" - OPEN EXISTING FILE

4. Read from questions file

AH = 3Fh - "READ" - READ FROM FILE OR DEVICE

5. Type more to file1

AH=40h - "WRITE" - WRITE TO FILE OR DEVICE

6. Send data to printer

AH = 05h - WRITE CHARACTER TO PRINTER

Yes, this is an example of nested multiple interrupts because you opened File1. And then subsequently you opened questions file without closing File1.

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