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The Z80 uses 252 out of the available 256 codes as single byte opcodes ("root instruction"); the four remaining codes are used extensively as opcode prefixes: CB and ED enable extra instructions and DD or FD selects IX+d or IY+d respectively (in some cases without
15 Jun 2016 The next big change was the enhanced instruction set, and this is where things get interesting, especially for emulator writers: Remember that the Intel 8080 had single-byte opcodes, and all 256 possible instruction codes were used. How would the Z80 go about cramming additional instruction slots into an
Appendices » Instructions Set. Here is a page for instructions that you can use in a z80 processor. Click on the instruction to gain more information. Intel Pentium 4 metapc - Disassemble all IBMPC opcodes 8085 - Intel 8085 z80 options specific for the ARMv7-A architecture, such as NEON instruction set. Z80 Instruction Set
25 Oct 2016 Most of the additional Z-80 opcodes are prefixed by bytes CB , DD , ED and FD which the 8080 treats as aliases for other instructions. The CB series are shift, rotate and bit test instructions: RLC , RRC , RL , RR , SLA , SRA , SRL , BIT , SET , RES and the undocumented SL1 . The DD and FD series are used
Intel® 64 and IA-32 Architectures. Software Developer's Manual. Volume 2 (2A, 2B, 2C & 2D):. Instruction Set Reference, A-Z. NOTE: The Intel 64 and IA-32 Architectures Software Developer's Manual consists of three volumes: Basic Architecture, Order Number 253665; Instruction Set Reference A-Z, Order Number 325383;.
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F. 0, nop, ld bc,**, ld (bc),a, inc bc, inc b, dec b, ld b,*, rlca, ex af,af', add hl,bc, ld a,(bc), dec bc, inc c, dec c, ld c,*, rrca. 1, djnz *, ld de,**, ld (de),a, inc de, inc d, dec d, ld d,*, rla, jr *, add hl,de, ld a,(de), dec de, inc e, dec e, ld e,*, rra. 2, jr nz,*, ld hl,**, ld (**),hl, inc hl, inc h, dec h, ld h,*, daa
16 Bit Transfer Instructions. 8080 Mnemonic, Z80 Mnemonic, Machine Code, Operation. LXI, B,word, LD, BC,word, 01word, BC <- word. LXI, D,word, LD, DE,word, 11word, DE <- word. LXI, H,word, LD, HL,word, 21word, HL <- word. LXI, SP,word, LD, SP,word, 31word, SP <- word. ---, LD, IX,word, DD21word, IX <- word.
support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the Z80 CPU. User Manual iii. Revision History. Each instance in the following revision history table reflects a change to this document from its previous version. For more . Instruction Op Codes .
Prefixes change the way the following opcodes are interpreted. All instructions without a prefix (without anything like the above before it) are documented in the official documentation. 1.2) CB Prefix [1] An opcode with a CBh prefix is a rotate, shift or bit test/set/reset instruction. There are a few instructions missing from the
This is an overview of the Z80 instruction set, including undocumented instructions and the R800 MULUB and MULUW instructions. Refer to the Z80 user manual for a detailed explanation of the instruction set. For more information Instruction, Timing Z80, Timing Z80+M1, Timing R800, Timing R800 + wait?, Opcode, Size
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