Zilog Z80N

22 mnemonics, 30 encoded forms, operands little-endian. Generated from crates/isa/src/z80.rs.

Cycle counts show the base cost; +p is an extra cycle when an indexed access crosses a page boundary, +t when a branch is taken.

SWAPNIB

Swap the nibbles of A

Mode	Opcode	Operands	Bytes	Cycles	Flags
	`ED 23`	—	2	8	—

MIRROR

Mirror the bits of A

Mode	Opcode	Operands	Bytes	Cycles	Flags
A	`ED 24`	—	2	8	—

TEST

AND A with n, set flags only

Mode	Opcode	Operands	Bytes	Cycles	Flags
n	`ED 27`	imm8	3	11	SZHPNC

BSLA

Barrel shift left arithmetic

Mode	Opcode	Operands	Bytes	Cycles	Flags
DE,B	`ED 28`	—	2	8	—

BSRA

Barrel shift right arithmetic

Mode	Opcode	Operands	Bytes	Cycles	Flags
DE,B	`ED 29`	—	2	8	—

BSRL

Barrel shift right logical

Mode	Opcode	Operands	Bytes	Cycles	Flags
DE,B	`ED 2A`	—	2	8	—

BSRF

Barrel shift right feed

Mode	Opcode	Operands	Bytes	Cycles	Flags
DE,B	`ED 2B`	—	2	8	—

BRLC

Barrel rotate left circular

Mode	Opcode	Operands	Bytes	Cycles	Flags
DE,B	`ED 2C`	—	2	8	—

MUL

8x8 multiply D*E into DE

Mode	Opcode	Operands	Bytes	Cycles	Flags
	`ED 30`	—	2	8	—
D,E	`ED 30`	—	2	8	—
DE	`ED 30`	—	2	8	—

ADD

Add (Z80N)

Mode	Opcode	Operands	Bytes	Cycles	Flags
HL,A	`ED 31`	—	2	8	—
DE,A	`ED 32`	—	2	8	—
BC,A	`ED 33`	—	2	8	—
HL,nn	`ED 34`	imm16	4	16	—
DE,nn	`ED 35`	imm16	4	16	—
BC,nn	`ED 36`	imm16	4	16	—

PUSH

Push a 16-bit immediate

Mode	Opcode	Operands	Bytes	Cycles	Flags
nn	`ED 8A`	imm-be16	4	23	—

OUTINB

Output (HL) to port (C), inc HL

Mode	Opcode	Operands	Bytes	Cycles	Flags
	`ED 90`	—	2	16	—

NEXTREG

Set a Next hardware register

Mode	Opcode	Operands	Bytes	Cycles	Flags
n,n	`ED 91`	imm8, imm8	4	20	—
n,A	`ED 92`	imm8	3	17	—

PIXELDN

Advance HL to the next pixel row

Mode	Opcode	Operands	Bytes	Cycles	Flags
	`ED 93`	—	2	8	—

PIXELAD

Compute pixel address into HL

Mode	Opcode	Operands	Bytes	Cycles	Flags
	`ED 94`	—	2	8	—

SETAE

Set A to the E pixel mask

Mode	Opcode	Operands	Bytes	Cycles	Flags
	`ED 95`	—	2	8	—

LDIX

Block load (transparent), inc

Mode	Opcode	Operands	Bytes	Cycles	Flags
	`ED A4`	—	2	16	—

LDWS

Load word, special

Mode	Opcode	Operands	Bytes	Cycles	Flags
	`ED A5`	—	2	14	—

LDDX

Block load (transparent), dec

Mode	Opcode	Operands	Bytes	Cycles	Flags
	`ED AC`	—	2	16	—

LDIRX

Repeat LDIX

Mode	Opcode	Operands	Bytes	Cycles	Flags
	`ED B4`	—	2	16 +t	—

LDPIRX

Repeat LDIX over a pattern

Mode	Opcode	Operands	Bytes	Cycles	Flags
	`ED B7`	—	2	16 +t	—

LDDRX

Repeat LDDX

Mode	Opcode	Operands	Bytes	Cycles	Flags
	`ED BC`	—	2	16 +t	—

Machines

Sinclair ZX Spectrum, Amstrad CPC, MSX, NEC PC-8801, Sega Master System

Sources

Encodings on this page were taken from:

Programming the Z80, 2nd edition — Rodnay Zaks, 1980
Z80 Microcomputer Handbook — Sams, 1985