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  2. Illegal opcode - Wikipedia

    en.wikipedia.org/wiki/Illegal_opcode

    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.

  3. Interrupts in 65xx processors - Wikipedia

    en.wikipedia.org/wiki/Interrupts_in_65xx_processors

    Internals of BRK/IRQ/NMI/RESET on a MOS 6502; Brad Taylor. "6502 'B' flag & BRK Opcode". 6502 Family Microprocessor Resources and Forum; 65xx Interrupt Primer – An extensive discussion of 65xx family interrupt processing. Investigating 65C816 Interrupts – An extensive discussion of interrupt processing that is specific to 65C816 native mode ...

  4. MOS Technology 6502 - Wikipedia

    en.wikipedia.org/wiki/MOS_Technology_6502

    Boards. Grant's 7/8-chip 6502 board Archived 2022-06-06 at the Wayback Machine; 6502 microprocessor training board Archived 2019-07-14 at the Wayback Machine; Build your own KIM-1 training board Archived 2019-07-14 at the Wayback Machine – see KIM-1; 6502 home computer on GitHub; PE6502 single board computer Archived 2020-05-03 at the Wayback ...

  5. WDC 65C02 - Wikipedia

    en.wikipedia.org/wiki/WDC_65C02

    The original 6502 has 56 instructions, which, when combined with different addressing modes, produce a total of 151 opcodes of the possible 256 8-bit opcode patterns. The remaining 105 unused opcodes are undefined, with the set of codes with low-order 4-bits with 3, 7, B or F left entirely unused, the code with low-order 2 having only a single ...

  6. Halt and Catch Fire (computing) - Wikipedia

    en.wikipedia.org/wiki/Halt_and_Catch_Fire...

    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 ...

  7. Opcode table - Wikipedia

    en.wikipedia.org/wiki/Opcode_table

    An opcode table (also called an opcode matrix) is a visual representation of all opcodes in an instruction set. ... 6502/6510/8500/8502 opcode table

  8. NOP (code) - Wikipedia

    en.wikipedia.org/wiki/NOP_(code)

    Opcode for OR 0,0,0. [7] LDI 26,0: 4 0x34000034 Palindromic NOP - that is, an instruction that executes as NOP regardless of whether byte order is interpreted as little-endian or big-endian. Some PA-RISC system instructions are required to be followed by seven palindromic NOPs. [7] POWER, PowerPC, Power ISA: NOP: 4 0x60000000 Opcode for ori r0 ...

  9. Talk:MOS Technology 6502/Archives/2015 - Wikipedia

    en.wikipedia.org/wiki/Talk:MOS_Technology_6502/...

    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."