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The Intel BCD opcodes are a set of six x86 instructions that operate with binary-coded decimal numbers. The radix used for the representation of numbers in the x86 processors is 2. This is called a binary numeral system. However, the x86 processors do have limited support for the decimal numeral system.
BCD (binary-coded decimal), also called alphanumeric BCD, alphameric BCD, BCD Interchange Code, [1] or BCDIC, [1] is a family of representations of numerals, uppercase Latin letters, and some special and control characters as six-bit character codes. Unlike later encodings such as ASCII, BCD codes were not standardized. Different computer ...
If source operand is all-0s, then LZCNT will return operand size in bits (16/32/64) and set CF=1. LZCNT r64,r/m64: F3 REX.W 0F BD /r: BMI1 Bit Manipulation Instruction Set 1: TZCNT r16,r/m16 TZCNT r32,r/m32: F3 0F BC /r: Count Trailing zeroes. [c] If source operand is all-0s, then TZCNT will return operand size in bits (16/32/64) and set CF=1 ...
bootcfg /ems on /port com1 /baud 9600 /id 1 On Windows Vista it is enabled by typing the following command where {default} is the OS entry in BCDedit: bcdedit /bootems {default} on In Windows Vista the serial port settings, Baud rate and Port ID, are accessed and modified using the following command:
This scheme can also be referred to as Simple Binary-Coded Decimal (SBCD) or BCD 8421, and is the most common encoding. [12] Others include the so-called "4221" and "7421" encoding – named after the weighting used for the bits – and "Excess-3". [13]
The FLAGS register is the status register that contains the current state of an x86 CPU.The size and meanings of the flag bits are architecture dependent. It usually reflects the result of arithmetic operations as well as information about restrictions placed on the CPU operation at the current time.
AMD was the first to introduce the instructions that now form Intel's BMI1 as part of its ABM (Advanced Bit Manipulation) instruction set, then later added support for Intel's new BMI2 instructions.
The CPC, SBC and SBCI (compare/subtract with carry) instructions do not set the Z flag when the result is zero, but only clear it if the result is non-zero. [ 1 ] : 79,147,149 For fixed precision multi-byte comparisons, implemented with an unrolled CP; CPC; CPC; CPC sequence, this produces a zero flag which is set only if the entire difference ...