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.
In addition, the x87 part supports a unique 18-digit (ten-byte) BCD format that can be loaded into and stored from the floating point registers, from where ordinary FP computations can be performed.[1]
The integer BCD instructions are no longer supported in long mode.
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The IntelBCDopcodes are a set of six x86 instructions that operate with binary-coded decimal numbers. The radix used for the representation of numbers...
security), a security framework ASCII adjust after addition, one of the IntelBCDopcodes Authentication, Authorization, and Accounting architectural framework...
chemical elements ASCII Adjust after Subtraction, one of the x86 IntelBCDopcodes Acute aortic syndrome Anabolic–androgenic steroid, or simply anabolic...
The Intel 8087, announced in 1980, was the first floating-point coprocessor for the 8086 line of microprocessors. The purpose of the chip was to speed...
the Intel 8087 coprocessor, several reserved opcodes would perform operations behaving similarly to existing defined x87 instructions. These opcodes were...
set CLMUL instruction set F16C FMA instruction set Intel ADX XOP instruction set IntelBCDopcodes (also used for advanced bit manipulation techniques)...
designation ASCII Adjust after Multiplication, computer instruction in IntelBCDopcodes#Multiplication Association for Accessible Medicines, formerly known...
(IATA code: AAD) aad, or "ASCII Adjust before Division", one of the IntelBCDopcodes AAD, the SPARS code for a CD that was recorded analog, mixed analog...
IntelBCDopcodes have remained in the x86 family to this day, although they are not supported in long mode. These instructions convert one-byte BCD numbers...
called an opcode; the NOP instruction translates to 0x90, for instance, and the HLT instruction translates to 0xF4. There are potential opcodes with no...
The Intel 8080 ("eighty-eighty") is the second 8-bit microprocessor designed and manufactured by Intel. It first appeared in April 1974 and is an extended...
unimplemented opcodes with specially written software intercepted at the BRK instruction's 0xFFFE vector. All of the undefined opcodes have been replaced...
registers. The binary opcodes (machine language) were identical, but preceded by a new opcode prefix. Zilog published the opcodes and related mnemonics...
conclusions worked in concert; removing instructions would allow the instruction opcodes to be shorter, freeing up bits in the instruction word which could then...
of JMP (opcodes E9 and FF /4), CALL (opcodes E8 and FF /2), RET (opcodes C2 and C3), and the short/near forms of the Jcc instructions (opcodes 70..7F and...
all seven 8-bit registers. This was largely due to a desire to keep all opcodes one byte long. The binary-compatible Z80 later added prefix-codes to escape...
instructions, patterned on the Intel 4040. Most of these were a one-address format, in which case the instruction opcode was normally split in two, with...
binary-coded decimal (BCD) format. Whenever one of these is encountered, for instance, in the line number in GOTO 100, the tokenized BCD value has to be converted...
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