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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 ...
In Windows 3.1, additional options are available, such as /3, which starts Windows in 386 enhanced mode, and /S, which starts Windows in standard mode [2] A startup sound was first added in Windows 3.0 after installing the Multimedia Extensions (MME), [ 3 ] but not enabled by default until Windows 3.1.
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:
All PC compatibles operate the PIT at a clock rate of 105/88 = 1.193 18 MHz, 1 ⁄ 3 the NTSC colorburst frequency which comes from dividing the system clock (14.31818 MHz) by 12. This is a holdover of the very first CGA PCs – they derived all necessary frequencies from a single quartz crystal , and to make TV output possible, this oscillator ...
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.
This behavior is also present in Windows 2.0 and Windows 2.1. Windows 3.0 uses a text-mode screen for displaying important system messages, usually from digital device drivers in 386 Enhanced Mode or other situations where a program could not run. Windows 3.1 changed the color of this screen from black