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Essay

Booting the Computer

Essay specific features

 

Issue:

Technology

 

Written by:

Gerald L

 

Date added:

January 27, 2016

 

Level:

University

 

Grade:

A

 

No of pages / words:

2 / 405

 

Was viewed:

7373 times

 

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Essay content:

These instructions are in a special kind of memory called read-only-memory or ROM. The computer executes these instructions to read additional instructions from its disk, and those instructions then tell it how to load the operating system. The first computers I ever wrote code for (DEC PDP-8's and PDP-11's) had no ROM...
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But they did have front panels with toggle switches that allowed you to manually enter values to be stored in memory. To start the computer you had to enter a short program, usually 6 or 7 machine instructions, in binary through the toggle switches. These instructions were a tight loop which was just barely enough to read the first block from some device - typically punched paper tape or DECtape...
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