The first chapter of computing system roaming

1. Text characters: Use the ASCII standard to denote "each character is represented by an integer value of a unique single-byte size"

Most computer systems use the ASCII standard to represent text characters, such as the HELLO.C program in the system as a sequence of ASCII values (this is the initial representation of the program in the computer systems).

2. Three basic abstraction concepts provided by the operating system:

File: A sequence of bytes that abstracts the concept of an I/O device to a file. (including disks, keyboards, monitors, networks, etc. can all be considered files), an abstraction that provides a unified perspective to the application.

Virtual Memory: Is the abstraction of main memory and disk.

Process: is an abstraction of the operating system for a running program.

The first chapter of computing system roaming