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The Zilog Z80 is an 8-bit microprocessor designed by Zilog that played an important role in the evolution of early computing. Software-compatible with the Intel 8080, it offered a compelling alternative due to its better integration and increased performance. The Z80 boasted fourteen registers compared to the 8080's seven, along with additional ...
Telmac 1800 running CHIP-8 game Space Intercept (Joseph Weisbecker, 1978) CHIP-8 is an interpreted programming language, developed by Joseph Weisbecker on his 1802 microprocessor. It was initially used on the COSMAC VIP and Telmac 1800, which were 8-bit microcomputers made in the mid-1970s. CHIP-8 was designed to be easy to program for, as well ...
The Motorola 6800 microprocessor was the first for which an undocumented assembly mnemonic HCF became widely known. The operation codes (opcodes—the portions of the machine language instructions that specify an operation to be performed) hexadecimal 9D and DD were reported and given the unofficial mnemonic HCF in a December 1977 article by Gerry Wheeler in BYTE magazine on undocumented ...
Cryptographic (e.g. RDRAND, AES-NI) Discontinued (e.g. 3DNow!, MPX, XOP) v. t. e. The x86 instruction set refers to the set of instructions that x86 -compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor.
MOS 6510. WDC 65C02. WDC 65C816. The MOS Technology 6502 (typically pronounced "sixty-five-oh-two" or "six-five-oh-two") [ 3 ] is an 8-bit microprocessor that was designed by a small team led by Chuck Peddle for MOS Technology. The design team had formerly worked at Motorola on the Motorola 6800 project; the 6502 is essentially a simplified ...
An illegal opcode, also called an unimplemented operation, [1] unintended opcode[2] or undocumented instruction, is an instruction to a CPU that is not mentioned in any official documentation released by the CPU's designer or manufacturer, which nevertheless has an effect. Illegal opcodes were common on older CPUs designed during the 1970s ...
v. t. e. An opcode table (also called an opcode matrix) is a visual representation of all opcodes in an instruction set. It is arranged such that each axis of the table represents an upper or lower nibble, which combined form the full byte of the opcode. Additional opcode tables can exist for additional instructions created using an opcode prefix.
In computing, an opcode[1][2] (abbreviated from operation code, [1] also known as instruction machine code, [3] instruction code, [4] instruction syllable, [5][6][7][8] instruction parcel or opstring[9][2]) is the portion of a machine language instruction that specifies the operation to be performed. Beside the opcode itself, most instructions ...