Byte of the 8080 and the 8086, used in early personal computers, could also perform a small number of operations on the four-bit pairs in a byte, such as the decimal-add-adjust (DAA) instruction. A four-bit quantity is often called a nibble, also "nybble", which is conveniently represented by a single hexadecimal digit. The term "octet" is used to unambiguously specify a size of eight bits. It is used extensively in protocol definitions. Historically, the term "octad" or "octade" was used to denote eight bits as well at least in Western Europe; however, this usage is no longer common. The exact origin
Consistent Overhead Byte Stuffing end of the packet. There are two equivalent ways to describe the COBS encoding process: These examples show how various data sequences would be encoded by the COBS algorithm. In the examples, all bytes are expressed as hexadecimal values, and encoded data is shown with text formatting to illustrate various features: Below is a diagram using example 3 from above table, to illustrate how each modified data byte is located, and how it is identified as a data byte or an end of frame byte. Examples 7 through 10 show how the overhead varies depending on the data being encoded