Answered: 1)Why would DMA be useless if the…

Engineering

Computer Science

1)Why would DMA be useless if the computer did not have interrupt capability?

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter5: Data Storage Technology

Section: Chapter Questions

Problem 11VE

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Concept explainers

Fundamentals of Input and Output Performance

The I/O subsystem is a component of computer system design that uses buses to assist communication between the Central Processing Unit, Computer Memory/Storage, and Input and Output Devices (that is known as peripheral devices). The I/O subsystem includes disc controllers, tape drives, discs, system buses, and other devices. The I/O database application reads and writes drives using the operating system windows I/O.

Question

1)Why would DMA be useless if the computer did not have interrupt capability?

2). A multiplattered hard disk is divided into 1100 sectors and 40,000 cylinders.
There are six platter surfaces. Each block holds 512 bytes. The disk is
rotating at a rate of 4800 rpm. The disk has an average seek time of 12
msec.
a. What is the total capacity of this disk?
b. What is the disk transfer rate in bytes per second?
c. What are the minimum and maximum latency times for this disk? What is
the average latency time for this disk?

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Subject: Computer Organization and ArchitectureTopics Covered: IA-32 Architecture SEE ATTACHED PHOTO FOR THE PROBLEM
This question is in the course of computer architecture. I need the answer ASAP. Solving any part of the homework would be greatly appreciated! Thanks! (Ignore the Turkish translations)
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Calculate the access time for a disk having the size of 512 byte/sector and the seek time of 12ms. The rotational rate is 5700 RPM. The data transfer rate is 3MB/sec, and the the controller overhead is 1ms, you may even assume that there is no service time for the access.