Recent questions tagged io-handling

+1 vote

1 answer

1

I/O-COA
I think percentage of processor time consumed should be $\frac{ \,ISR\,time}{ISR\,time+\,Data\,Transfer\,Time}=\frac{100}{100+122}$. Is it correct?

asked Oct 30 in CO & Architecture by Ayush Upadhyaya Boss (19k points) | 45 views

0 votes

2 answers

2

Non Vectored Interrupt

asked Oct 21 in CO & Architecture by Na462 Loyal (7.5k points) | 53 views

0 votes

0 answers

3

Vectored I/O

asked Sep 24 in CO & Architecture by Na462 Loyal (7.5k points) | 41 views

+2 votes

1 answer

4

I/O operation
Please Explain Every Point :) Ans. All are Correct

asked Aug 13 in CO & Architecture by Na462 Loyal (7.5k points) | 122 views

0 votes

0 answers

5

Interrupt Driven I/O
Consider a system employing interrupt driven I/O for a particular device that transfer data at an average of 8 KB/sec on a continuous basis. Consider interrupt processing takes about 100 μsec i.e. time to jump to ISR, execute it and return to main program. The ... /O device if interrupts occur for every byte is ________. [Assume 1 K = 1024] (Upto 2 decimal places) Ans. 0.81

asked Jul 25 in CO & Architecture by Na462 Loyal (7.5k points) | 99 views

0 votes

2 answers

6

UGCNET-July-2018-II-54
Normally user programs are prevented from handling I/O directly by I/O instructions in them. For CPUs having explicit I/O instructions, such I/O protection is ensured by having the I/O instructions privileged. In a CPU with memory mapped I/O, ... I/O protection is ensured by a hardware trap I/O protection is ensured during system configuration I/O protection is not possible

asked Jul 13 in Operating System by Pooja Khatri Active (5.1k points) | 90 views

+1 vote

1 answer

7

I/O Interface
State whether the following statement is TRUE or FALSE and why ? In a microprocessor-based system, if a bus (DMA) request and an interrupt request arrive simultaneously, the microprocessor attends first to the bus request.

asked May 4 in CO & Architecture by ankitgupta.1729 Loyal (8.4k points) | 158 views

+11 votes

4 answers

8

GATE1990-4-ii
State whether the following statements are TRUE or FALSE with reason: The data transfer between memory and $I/O$ devices using programmed $I/O$ is faster than interrupt-driven $I/O$.

asked Nov 24, 2016 in CO & Architecture by makhdoom ghaya Boss (40.5k points) | 1k views

+1 vote

1 answer

9

GATE1987-2b
State whether the following statements are TRUE or FALSE: Data transfer between a microprocessor and an $I/O$ device is usually faster in memory-mapped-$I/O$ scheme than in $I/O$-mapped -$I/O$ scheme.

asked Nov 9, 2016 in CO & Architecture by makhdoom ghaya Boss (40.5k points) | 282 views

+1 vote

2 answers

10

GATE1987-2a
State whether the following statements are TRUE or FALSE In a microprocessor-based system, if a bus (DMA) request and an interrupt request arrive sumultaneously, the microprocessor attends first to the bus request.

asked Nov 9, 2016 in CO & Architecture by makhdoom ghaya Boss (40.5k points) | 347 views

0 votes

0 answers

11

Different types of ports and their difference

asked Nov 3, 2016 in CO & Architecture by LavTheRawkstar Active (5.2k points) | 100 views

+2 votes

4 answers

12

ISRO2011-58
In DMA transfer scheme, the transfer scheme other than burst mode is cycle technique stealing technique cycle stealing technique cycle bypass technique

asked Jun 23, 2016 in CO & Architecture by jothee Veteran (112k points) | 1.9k views

+8 votes

3 answers

13

ISRO2011-39
Two control signals in microprocessor which are related to Direct Memory Access (DMA) are INTR & INTA RD & WR S0 & S1 HOLD & HLDA

asked Jun 22, 2016 in CO & Architecture by jothee Veteran (112k points) | 1.8k views

+5 votes

2 answers

14

ISRO2008-36
An interrupt in which the external device supplies its address as well as the interrupt requests is known as vectored interrupt maskable interrupt non maskable interrupt designated interrupt

asked Jun 12, 2016 in CO & Architecture by jothee Veteran (112k points) | 1.8k views

+3 votes

4 answers

15

ISRO-2013-52
Suppose we have variable logical records of lengths of $5$ bytes, $10$ bytes and $25$ bytes while the physical block size in disk is $15$ bytes. What is the maximum and minimum fragmentation seen in bytes? $25$ and $5$ $15$ and $5$ $15$ and $0$ $10$ and $5$

asked May 2, 2016 in Operating System by makhdoom ghaya Boss (40.5k points) | 2.7k views

0 votes

1 answer

16

Direct memory access is used for high-speed I/O devices.

asked Nov 18, 2015 in CO & Architecture by Anurag_s Loyal (8.2k points) | 519 views

0 votes

1 answer

17

bit rate of video terminal unit
what is bit rate of video terminal unit with 80 character/line , 8 bits/character and horizontal sweep time of 100 micro sec?

asked Oct 7, 2015 in Operating System by monali Junior (619 points) | 382 views

+5 votes

2 answers

18

ISRO2009-78
On receiving an interrupt from an I/O device,the CPU Halts for a predetermined time Branches off to the interrupt service routine after completion of the current instruction Branches off to the interrupt service routine immediately Hands over control of address bus and data bus to the interrupting device

asked Oct 5, 2015 in CO & Architecture by ajit Active (3.3k points) | 2.8k views

+12 votes

2 answers

19

GATE2004-IT-11, ISRO2011-33
What is the bit rate of a video terminal unit with $80$ characters/line, $8$ $\text{bits/character}$ and horizontal sweep time of $100$ $\text{µs}$ (including $20$ $\text{µs}$ of retrace time)? $8$ $\text{Mbps}$ $6.4$ $\text{Mbps}$ $0.8$ $\text{Mbps}$ $0.64$ $\text{Mbps}$

asked Nov 2, 2014 in Operating System by Ishrat Jahan Boss (19.1k points) | 2.4k views

+23 votes

2 answers

20

GATE2006-IT-8
Which of the following DMA transfer modes and interrupt handling mechanisms will enable the highest I/O band-width? Transparent DMA and Polling interrupts Cycle-stealing and Vectored interrupts Block transfer and Vectored interrupts Block transfer and Polling interrupts

asked Oct 31, 2014 in Operating System by Ishrat Jahan Boss (19.1k points) | 3.4k views

+18 votes

4 answers

21

GATE1996-25
A hard disk is connected to a $50$ MHz processor through a DMA controller. Assume that the initial set-up of a DMA transfer takes $1000$ clock cycles for the processor, and assume that the handling of the interrupt at DMA completion requires $500$ clock cycles for the processor. ... Kbytes 0.98 16 Kbytes 0.90 16 Kbytes 0.99 64 Kbytes 0.95 64 Kbytes 0.995 Size Hit Ratio 250 M bytes 1.0

asked Oct 10, 2014 in CO & Architecture by Kathleen Veteran (59.7k points) | 2.6k views

+10 votes

1 answer

22

GATE1996-1.24
For the daisy chain scheme of connecting I/O devices, which of the following statements is true? It gives non-uniform priority to various devices It gives uniform priority to all devices It is only useful for connecting slow devices to a processor device It requires a separate interrupt pin on the processor for each device

asked Oct 9, 2014 in CO & Architecture by Kathleen Veteran (59.7k points) | 1.4k views

+16 votes

2 answers

23

GATE1996-1.20, ISRO2008-56
Which of the following is an example of spooled device? A line printer used to print the output of a number of jobs A terminal used to enter input data to a running program A secondary storage device in a virtual memory system A graphic display device

asked Oct 9, 2014 in Operating System by Kathleen Veteran (59.7k points) | 2.9k views

+3 votes

1 answer

24

GATE1995-17
An asynchronous serial communication controller that uses a start-stop scheme for controlling the serial I/O of a system is programmed for a string of length seven bits, one parity bit (odd parity) and one step bit. The transmission rate is $1200$ bits/second. What is ... What is the size of the video buffer RAM for the display to be used in monochrome ($1$ bit per pixel) graphics mode?

asked Oct 8, 2014 in Operating System by Kathleen Veteran (59.7k points) | 518 views

+9 votes

3 answers

25

GATE1997-2.4
The correct matching for the following pairs is: (A) DMA I/O (1) High speed RAM (B) Cache (2) Disk (C) Interrupt I/O (3) Printer (D) Condition Code Register (4) ALU A-4 B-3 C-1 D-2 A-2 B-1 C-3 D-4 A-4 B-3 C-2 D-1 A-2 B-3 C-4 D-1

asked Sep 29, 2014 in CO & Architecture by Kathleen Veteran (59.7k points) | 948 views

+11 votes

3 answers

26

GATE1998-1.29
Which of the following is an example of a spooled device? The terminal used to enter the input data for the C program being executed An output device used to print the output of a number of jobs The secondary memory device in a virtual storage system The swapping area on a disk used by the swapper

asked Sep 26, 2014 in Operating System by Kathleen Veteran (59.7k points) | 1.1k views

+17 votes

2 answers

27

GATE2005-20
Normally user programs are prevented from handling I/O directly by I/O instructions in them. For CPUs having explicit I/O instructions, such I/O protection is ensured by having the I/O instruction privileged. In a CPU with memory mapped I/O, there is ... s) I/O protection is ensured by a hardware trap I/O protection is ensured during system configuration I/O protection is not possible

asked Sep 22, 2014 in Operating System by Kathleen Veteran (59.7k points) | 2.7k views

+22 votes

6 answers

28

GATE2005-19
Which one of the following is true for a CPU having a single interrupt request line and a single interrupt grant line? Neither vectored interrupt nor multiple interrupting devices are possible Vectored interrupts are not possible but ... interrupts and multiple interrupting devices are both possible Vectored interrupts are possible but multiple interrupting devices are not possible

asked Sep 22, 2014 in Operating System by Kathleen Veteran (59.7k points) | 3.9k views

+19 votes

4 answers

29

GATE2008-64, ISRO2009-13
Which of the following statements about synchronous and asynchronous I/O is NOT true? An ISR is invoked on completion of I/O in synchronous I/O but not in asynchronous I/O In both synchronous and asynchronous I/O, an ISR (Interrupt Service Routine) is ... the process waiting for the completion of I/O is woken up by the ISR that is invoked after the completion of I/O

asked Sep 12, 2014 in CO & Architecture by Kathleen Veteran (59.7k points) | 4.6k views

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