Decimal computer Decimal computer Decimal computers are computers which can represent numbers and addresses in decimal as well as providing instructions to operate on those numbers and addresses directly in decimal, without conversion to a pure binary representation. Some also had a variable wordlength, which enabled operations on numbers with a large number of digits. Early computers that were exclusively decimal include the ENIAC, IBM NORC, IBM 650, IBM 1620, IBM 7070. In these machines, the basic unit of data was the decimal digit, encoded in one of several schemes, including binary-coded decimal or BCD, bi-quinary, excess-3, and two-out-of-five code. Except for
Decimal128 floating-point format has possible representations ( if you include both signed zeros). Decimal128 floating point is a relatively new decimal floating-point format, formally introduced in the 2008 version of IEEE 754 as well as with . IEEE 754 allows two alternative representation methods for decimal128 values. The standard does not specify how to signify which representation is used, for instance in a situation where decimal128 values are communicated between systems. In one representation method, based on binary integer decimal (BID), the significand is represented as binary coded positive integer. The other, alternative, representation method is based on densely packed decimal (DPD) for