Скачать или смотреть Hexadecimal Numbering System and its Relation to Binary Numbering System.

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In computers and programming a hexadecimal numbering system is used. It differs from decimal system in that, in addition to digits from 0 to 9, latin letters from A to F are used, that also act as digits, so, hexadecimal uses a total of 16 digits instead of 10. In essence, the hexadecimal system is a simplified way of representing binary numbers. It basically boils down to a simple replacement of every combination of 4 binary digits – there are also 16 of them -- with one hexadecimal digit... Like this. So, 8 bit of binary data can be represented by two hex digits, while 16 bit of binary data will take up 4 hex digits, and so on. By the way, in programming 4 bits are called a nibble, 8 bits are called a byte, and 16 bits and up are called a word. Now these values will look like this... And our ROM chip will decode to addresses from 0 to 7FFF, while the RAM chip will take up address range from 8000 to FFFF... We must pronounce hex numbers by a single digit, because 8000 is not 8 thousand, it’s a different number... Hex numbers have their own designation in programming. For example, the C language uses prefix 0x, while in assembly language, Latin letter H (H for hex, uppercase or lowercase, doesn’t matter) is appended at the end of the number. All these designations are equivalent.

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