CS609 Midterm Past Papers by Junaid

1. Interrupt is used to read date from Real Time Clock. 1A/02H 1A/03H

 1A/04H

1A/05H

2. If we are at address F000:0000H, then we are supposed to invoke interrupt (s) for

•  BIOS
•  COM4
•  LPT3
•  LPT1

3. There are two main types of interrupts known as

•  PC based interrupts and software interrupts
•  Hardware interrupts and kernel based interrupts

 Hardware interrupts and software interrupts

•  PC based interrupts and kernel based interrupts

4. The tail value of the keyboard indicates the of the buffer.

 Start

 End  Middle  Tail 5. is a Disk Interrupt.  9H 11H  13H 15H

6. IRQ7 is used by the interface.  Keyboard  Mouse

 Printer

 CPU

7. DSR stand for

DATA Set Ready

 Data Service Ready Data Serially Received  Data Stock Ready

8. In RS-232C Standard (Serial Communication) data is send through line.  RxD  TxD  DTR  DSR
9. In a standard RS-232C Serial communication, a DTE device is usually a and DCE device is usually a

 PC, Modem

 Modem, PC

10. Starting address of Interrupt Vector Table (IVT) in main memory is

•  0

11. BIOS function 1Ah/06h is used to set

•  Time
•  Date

 Alarm

•  Data

12. Service 0 of INT can be used to set the line parameter of the UART or COM port.

•  14H 15H 13H 12H

13. Information about pending interrupts is held by

•  Interrupt Service Register
•  Interrupt Service Register

 Interrupt Request Register

•  Interrupt Required Register

14. register is used to store Interrupt service number.

•  AL
•  DH
•  AH
•  CH

15. If the processor is 386 then the bit of the EFLAGS register will not be set.

•  12th
•  18th
•  20th
•  24th

16. Interrupts and it’s service are used to access disk.

 13H, 3H

13H, 12H 09H, 3H 12H, 3H

17. The interval timer can operate in modes.

•  Three
•  Four
•  Five
•  Six

18. There are main types of serial communication.

•  2

19. The BIOS interrupt 0x1Ah can be used to configure real time clock

•  TRUE
•  FALSE

20. DOS command gives the status of the memory and also points out which memory area is occupied by a particular process.

 mem/d

•  mem/e
•  mem/m
•  mem/s