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The proposed IEEE 754r standard limits the range of numbers to a significand of the form 10 n −1, where n is the number of whole decimal digits that can be stored in the bits available so that decimal rounding is effected correctly.
The otherwise binary Wang VS machine supported a 64-bit decimal floating-point format in 1977. [2] The Motorola 68881 supported a format with 17 digits of mantissa and 3 of exponent in 1984, with the floating-point support library for the Motorola 68040 processor providing a compatible 96-bit decimal floating-point storage format in 1990. [2]
In the decimal system, there are 10 digits, 0 through 9, which combine to form numbers. In an octal system, there are only 8 digits, 0 through 7. That is, the value of an octal "10" is the same as a decimal "8", an octal "20" is a decimal "16", and so on.
In computing, decimal64 is a decimal floating-point computer number format that occupies 8 bytes (64 bits) in computer memory. It was formally introduced in the 2008 revision [ 1 ] of the IEEE 754 standard, which was taken over into the ISO/IEC/IEEE 60559:2011 [ 2 ] standard.
Two neighboring 64-bit registers are used. Quadruple-precision arithmetic is not supported in the vector register. [41] The RISC-V architecture specifies a "Q" (quad-precision) extension for 128-bit binary IEEE 754-2008 floating-point arithmetic. [42] The "L" extension (not yet certified) will specify 64-bit and 128-bit decimal floating point. [43]
The memory of the IBM 1620 is organized into 6-bit addressable digits, the usual 8, 4, 2, 1 plus F, used as a flag bit and C, an odd parity check bit. BCD alphamerics are encoded using digit pairs, with the "zone" in the even-addressed digit and the "digit" in the odd-addressed digit, the "zone" being related to the 12 , 11 , and 0 "zone ...
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