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The 6502 instruction set includes BRK (opcode $00), which is technically a software interrupt (similar in spirit to the SWI mnemonic of the Motorola 6800 and ARM processors). BRK is most often used to interrupt program execution and start a machine language monitor for testing and debugging during software development.
The 65xx family of microprocessors, consisting of the MOS Technology 6502 and its derivatives, the WDC 65C02, WDC 65C802 and WDC 65C816, and CSG 65CE02, all handle interrupts in a similar fashion. There are three hardware interrupt signals common to all 65xx processors and one software interrupt, the BRK instruction.
This is set to zero on startup or reset, meaning that its store-Z-to-memory instruction, STZ, works just like it does in the 65C02 where the same instruction means store-zero-to-memory. This allows unmodified 65C02 code to run on the 65CE02. A number of other instructions are added or modified to allow access to the Z register.
The Mitsubishi 740 family has a processor core that executes a superset of the 6502 instruction set including many of the extensions added in the 65C02. There is a core set of new instructions common across all 740 family members, plus other instructions that exist in specific parts.
It has 92 instructions, an 8-bit data bus, a 16-bit accumulator, and a 24-bit address bus. The CPU runs between 1.79 MHz and 3.58 MHz, and uses an extended MOS Technology 6502 instruction set . Major features
6502 - the first RISC µP – With link to concise 6502 programming chart in PDF (Eric Clever).[] On 12 November 2006 this was "reworded" and moved to the 6502 trivia section. A magazine article once referred to the 6502 as the original RISC processor, due to its efficient and simple instruction set and its 256 zero-page "registers."
The Western Design Center (WDC) 65C02 microprocessor is an enhanced CMOS version of the popular nMOS-based 8-bit MOS Technology 6502.It uses less power than the original 6502, fixes several problems, and adds new instructions.
The RISC-V instruction set refers to the set of instructions that RISC-V compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor.