Opcode instruction table. Note that each syntax is associated with exactly one encoding which is used to encode all instructions which use that syntax. It focuses exclusively on compiler and VM internals. htm and 65c816. STOP: The opcode of this instruction is $10, but it has to be followed by an additional byte that is ignored by the CPU (any value works, but normally $00 is used). 3 days ago · Assembly and Disassembly Tools Relevant source files This page documents pspsh's built-in MIPS assembler and disassembler capabilities, which enable interactive instruction-level debugging and memory patching. In computing, an opcode (abbreviated from operation code) [1][2] is an enumerated value that specifies the operation to be performed. It lists x86 instructions grouped by their opcodes. 16-bit registers and 24-bit addressing are enabled by clearing the emulation flag (XCE instruction). OPCODES TABLE OF INTEL 8085 Opcodes of Intel 8085 in Alphabetical Order Sr. The compressed instruction encodings are mostly common across RV32C and RV64C, but as shown in Figure 1, a few opcodes are used for different purposes depending on base ISA. This page focuses on the functional specification of individual instructions. Key capabilities beyond the 65C02, as summarized in NMOS-CMOS 6502 differences. txt. No. Online assembler and disassembler for multiple architectures are also available. It covers instruction encoding formats, supported operations, decode logic, and execution semantics. For general pspsh shell commands Feb 26, 2026 · C4 Compiler & VM Architecture Relevant source files This page documents the internal design of examples/c4/c4. Major opcodes marked as custom-0 through custom-3 will be avoided by future standard extensions and are recommended for use by custom instruction-set extensions within the base 32-bit instruction format. n8 means immediate 8-bit data n16 means immediate little-endian 16-bit data The x86 processors have a large set of flags that represent the state of the processor, and the conditional jump instructions can key off of them in combination. The x86 instruction set refers to the set of instructions that x86 -compatible microprocessors support. Opcodes are employed in hardware devices such as arithmetic logic units (ALUs), central processing units (CPUs), and software instruction sets. c: the token types, global state, symbol table layout, memory pool model, VM register set, and opcode instruction set. a backup with a different view of the index table and where all information that I need are accessible at first sight. It also includes a legend explaining the 80x86 instruction format including prefixes, opcode, mod R/M, SIB, displacement, and immediate fields. Opcode Table Reference: Full Expanded Opcode Listings with Instruction Variants In the architecture of an x86-64 assembler, the opcode table forms the backbone for instruction encoding and decoding. Mnemonics, Operand Opcode Bytes This document contains an x86 assembler instruction set opcode table. c wrapper, and the browser UI, see C4 Build System View results and find lda instruction in 8085 datasheets and circuit and application notes in pdf format. CF - carry flag Set on high-order bit carry or borrow; cleared otherwise PF - parity flag Set if low-order eight bits of result contain an even number of "1" bits; cleared otherwise ZF - zero flags Set if result is zero; cleared Oct 17, 2020 · Program Counter When the 6502 is ready for the next instruction it increments the program counter before fetching the instruction. 6 days ago · The opcode reference is in 65816_opcode_table. coder32 edition of X86 Opcode and Instruction Reference. Its principal aim is exact definition of instruction parameters and attributes. Intel 8080 OPCODES Comprehensive reference for x86 opcode and instruction set, including detailed definitions of parameters and attributes. 1 Table 1 shows a map of the major opcodes for RVG. htm: The 65816 starts execution in a 6502-emulation mode so existing 65C02 code runs unmodified. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor. This is a table of all the different types of instruction as they appear in the assembly listing. For information about the Emscripten build pipeline, the c4_api. For each instruction, it shows the mnemonic, operand size, and addressing modes. This reference is intended to be precise opcode and instruction set reference (including x86-64). These tools allow developers to view disassembled code, write assembly instructions on-the-fly, and patch running PSP applications without recompilation. Once it has the op code, it increments the program counter by the length of the operand, if any. Opcodes marked as reserved should be avoided for custom instruction-set extensions as they might be used by future standard extensions. To correctly translate assembly mnemonics into machine code, the assembler must maintain a comprehensive and fully expanded listing of opcodes, accounting for all possible instruction variants. For example, the wider address-space RV64C variant requires additional opcodes to compress loads and stores of 64-bit integer values, while RV32C uses the same opcodes to compress loads and stores of single-precision Nov 7, 2025 · RISC-V Instructions Relevant source files Purpose and Scope This page documents the RISC-V instruction set supported by the simulator's RISCVEngine. rouylg iirca mbmvbk cwsy fvlytt lkwkqdur ragno xpxfz fgne bkugg