1001 1111 100100 1100 0110 1111001 1000 010 1111

来源：蜘蛛抓取(WebSpider) 时间：2016-05-27 14:27 标签： atk0110 acpi utility
标准ASCII代码 - 推酷
标准ASCII代码
信息在计算机上是用二进制表示的，这种表示法让人理解就很困难。
因此计算机上都配有输入和输出设备，这些设备的主要目的就是，以一种人类可阅读的形式将信息在这些设备上显示出来供人阅读理解。
为保证人类和设备，设备和计算机之间能进行正确的信息交换，人们编制的统一的信息交换代码，这就是ASCII码表，它的全称是“美国信息交换标准代码”。
是美国信息互换标准代码(American Standard Code for Information Interchange)的简写，是基于英语的一种编码方式，用于计算机的信息传输。符合ISO646标准。
共定义了256个代码(从0-255)，从0-32位为控制字符(ASCII control characters)，从33-127位为可打印字符(ASCII printable characters)。
从0-127是标准的ASCII编码，从128-255是扩展的ASCII编码。
标准ASCII代码中，最高位B7为奇偶校验位。
(ASCII control characters)
Null character(空字符)
Start of Header(标题开始)
Start of Text(正文开始)
End of Text(正文结束)
End of Transmission(传输结束)
Enquiry(请求)
Acknowledgment(收到通知)
Bell(响铃)
Backspace(退格)
Horizontal Tab(水平制表符)
Line feed(换行键)
Vertical Tab(垂直制表符)
Form feed(换页键)
Carriage return(回车键)
Shift Out(不用切换)
Shift In(启用切换)
Data Link Escape(数据链路转义)
Device Control 1(设备控制1)
Device Control 2(设备控制2)
Device Control 3(设备控制3)
Device Control 4(设备控制4)
Negative Acknowledgement(拒绝接收)
Synchronous Idle(同步空闲)
End of Trans the Block(传输块结束)
Cancel(取消)
End of Medium(介质中断)
Substitute(替补)
Escape(溢出)
File Separator(文件分割符)
Group Separator(分组符)
Record Separator(记录分离符)
Unit Separator(单元分隔符)
可打印字符
可打印字符
(ASCII printable characters)
Space(空格)
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Tech Stuff - Hexadecimal, Decimal and Binary
The basic unit used in the computer world is the byte (a.k.a octet), a byte (or octet) has 8 bits (a.k.a binary digits). Most modern systems use multiples of a byte, thus, a 16-bit system is comprised of 2 bytes (2 x 8 = 16), a 32-bit system has 4 bytes (4 x 8 = 32) and a 64-bit system has 8 bytes (8 x 8 = 64). The term word, as in the description 32-bit word has largely disappeared from the technical lexicon.
The contents of any byte, for instance, in a memory location or on a network, can be expressed in many numbering systems. The most commonly used numbering systems are Decimal, Hexadecimal and Binary:
Numbering System
0 - 1,2,3...
The most common numbering system - dollars, metric etc. A byte (8 bits) has 256 possible values in the range 0 - 255
The basic level at which the electronic circuitry in a computer works - a single bit.
Hexadecimal
Each Hexadecimal character represents 4 bits (0 - 15 decimal) which is called a nibble (a small byte - honest!). A byte (or octet) is 8 bits so is always represented by 2 Hex characters in the range 00 to FF.
Historical Note: Once upon a time, when the world, and even the author of this page, was young, computers were built with 12-bit, 24-bit and even 36-bit words (it made some sense then, just looks strange today). Each of these word sizes is divisible by 3 and used an octal (base 8) numbering system. Each 3 bit element contained 8 values in the range 0 to 7. Thus, a memory location with the 12-bit binary value of 000.001.100.111 would be written in octal as 0147.
8 bit byte (octet) Conversion Table:
Hexadecimal
Hexadecimal
IPv4 Decimal to Hex Conversion
To convert a dotted decimal IPv4 address to hexadecimal, take each dotted decimal value and convert it using a hex calculator (standard windows calculator in scientific or prgrammer mode will do the job). This will yield:
IP address in dotted decimal = 192.168.0.5
Decimal 192 = Hexadecimal = C0
Decimal 168 = Hexadecimal = A8
= Hexadecimal = 00
= Hexadecimal = 05
IP Address in dotted hex = C0.A8.00.05
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