Binary-coded decimal - Revision history

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'''Binary-coded decimal''' (usually written as '''BCD''') is a way of storing arbitrary-length numbers in decimal base on a binary computer. Each decimal digit is stored as four [[bit]]s, usually two per [[byte]] ('packed'), although sometimes only one per byte ('un-packed'). 4-bit values not needed to encode a decimal digit are often used for other symbols, e.g. '-', to indicate a negative number.

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	'''Binary-coded decimal''' (usually written as '''BCD''') is a way of storing arbitrary-length numbers in decimal base on a binary computer. Each decimal digit is stored as four [[bit]]s, usually two per [[byte]] ('packed'), although sometimes only one per byte ('un-packed'). 4-bit values not needed to encode a decimal digit are often used for other symbols, e.g. '-', to indicate a negative number.		'''Binary-coded decimal''' (usually written as '''BCD''') is a way of storing arbitrary-length numbers in decimal base on a binary computer. Each decimal digit is stored as four [[bit]]s, usually two per [[byte]] ('packed'), although sometimes only one per byte ('un-packed'). 4-bit values not needed to encode a decimal digit are often used for other symbols, e.g. '-', to indicate a negative number.
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		+	On some machines, BCD was supported in the [[hardware]], as a formal data type with [[instruction]]s which could operate on BCD data (sometimes by an optional [[Commercial Instruction Set]]); on other machines, it was done in [[software]], via [[subroutine package]]s.
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