Difference between revisions of "User:CoBB"

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== Z80 instruction set ==
 
== Z80 instruction set ==
 
=== Reference ===
 
=== Reference ===
−
{| border=1 cellspacing=0 cellpadding=2
+
{| border="1" cellspacing="0" cellpadding="2"
 
! Instruction !! Opcode !! Time !! S !! Z !! X !! H !! Y !! P !! N !! C !! Effect
 
! Instruction !! Opcode !! Time !! S !! Z !! X !! H !! Y !! P !! N !! C !! Effect
 
|-
 
|-
−
| call A || <tt>11001101 Al Ah</tt> || 17 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := pc, pc := A
+
| adc a,R || <tt>10001rrr</tt> || 4 || + || + || + || + || + || V || 0 || + || a += R + cf
 
|-
 
|-
−
| ccf || <tt>00111111</tt> || 4 || - || - || v || X || v || - || 0 || X || hf := cf, cf := !cf
+
| adc a,J || <tt>11i11101 1000110b</tt> || 8 || + || + || + || + || + || V || 0 || + || a += J + cf
 
|-
 
|-
−
| ld R1,R2 || <tt>01xxxyyy</tt> || 4 || - || - || - || - || - || - || - || - || R1 := R2
+
| adc a,N || <tt>11001110 nnnnnnnn</tt> || 7 || + || + || + || + || + || V || 0 || + || a += N + cf
 
|-
 
|-
−
| pop P || <tt>11xx0001</tt> || 10 || - || - || - || - || - || - || - || - || P := (sp), sp += 2
+
| adc a,(hl) || <tt>10001110</tt> || 7 || + || + || + || + || + || V || 0 || + || a += (hl) + cf
 
|-
 
|-
−
| push P || <tt>11xx0101</tt> || 11 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := P
+
| adc a,(I+D) || <tt>11i11101 10001110 dddddddd</tt> || 19 || + || + || + || + || + || V || 0 || + || a += (I+D) + cf
 +
|-
 +
| adc hl,Q || <tt>11101101 01qq1010</tt> || 15 || + || + || + || + || + || V || 0 || + || hl += Q + cf
 +
|-
 +
| add a,R || <tt>10000rrr</tt> || 4 || + || + || + || + || + || V || 0 || + || a += R
 +
|-
 +
| add a,J || <tt>11i11101 1000010b</tt> || 8 || + || + || + || + || + || V || 0 || + || a += J
 +
|-
 +
| add a,N || <tt>11000110 nnnnnnnn</tt> || 7 || + || + || + || + || + || V || 0 || + || a += N
 +
|-
 +
| add a,(hl) || <tt>10000110</tt> || 7 || + || + || + || + || + || V || 0 || + || a += (hl)
 +
|-
 +
| add a,(I+D) || <tt>11i11101 10000110 dddddddd</tt> || 19 || + || + || + || + || + || V || 0 || + || a += (I+D)
 +
|-
 +
| add hl,Q || <tt>00qq1001</tt> || 11 || - || - || + || + || + || - || 0 || + || hl += Q
 +
|-
 +
| add I,Q || <tt>11i11101 00qq1001</tt> || 15 || - || - || + || + || + || - || 0 || + || I += Q
 +
|-
 +
| and R || <tt>10100rrr</tt> || 4 || + || + || + || 1 || + || P || 0 || 0 || a := a AND R
 +
|-
 +
| and J || <tt>11i11101 1010010b</tt> || 8 || + || + || + || 1 || + || P || 0 || 0 || a := a AND J
 +
|-
 +
| and N || <tt>11100110 nnnnnnnn</tt> || 7 || + || + || + || 1 || + || P || 0 || 0 || a := a AND N
 +
|-
 +
| and (hl) || <tt>10100110</tt> || 7 || + || + || + || 1 || + || P || 0 || 0 || a := a AND (hl)
 +
|-
 +
| and (I+D) || <tt>11i11101 10100110 dddddddd</tt> || 19 || + || + || + || 1 || + || P || 0 || 0 || a := a AND (I+D)
 +
|-
 +
| bit B,R || <tt>11001011 01bbbrrr</tt> || 8 || + || + || + || 1 || + || P || 0 || - || tmp := R AND [1 << B]
 +
|-
 +
| bit B,(hl) || <tt>11001011 01bbb110</tt> || 12 || + || + || X || 1 || X || P || 0 || - || tmp := (hl) AND [1 << B],<br>xf := memptr.13, yf := memptr.11
 +
|-
 +
| bit B,(I+D) || <tt>11i11101 11001011 dddddddd 01bbb***</tt> || 20 || + || + || X || 1 || X || P || 0 || - || tmp := (I+D) AND [1 << B],<br>xf := [I+D].13, yf := [I+D].11
 +
|-
 +
| call A || <tt>11001101 alalalal ahahahah</tt> || 17 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := pc, pc := A
 +
|-
 +
| call C,A || <tt>11ccc100 alalalal ahahahah</tt> || 17/10 || - || - || - || - || - || - || - || - || if C then sp -= 2, (sp) := pc, pc := A
 +
|-
 +
| ccf || <tt>00111111</tt> || 4 || - || - || A || X || A || - || 0 || X || hf := cf, cf := ~cf
 +
|-
 +
| cp R || <tt>10111rrr</tt> || 4 || + || + || X || + || X || V || 1 || + || tmp := a - R, xf := R.5, yf = R.3
 +
|-
 +
| cp J || <tt>11i11101 1011110b</tt> || 8 || + || + || X || + || X || V || 1 || + || tmp := a - J, xf := J.5, yf = J.3
 +
|-
 +
| cp N || <tt>11111110 nnnnnnnn</tt> || 7 || + || + || X || + || X || V || 1 || + || tmp := a - N, xf := N.5, yf = N.3
 +
|-
 +
| cp (hl) || <tt>10111110</tt> || 7 || + || + || X || + || X || V || 1 || + || tmp := a - (hl), xf := (hl).5, yf = (hl).3
 +
|-
 +
| cp (I+D) || <tt>11i11101 10111110 dddddddd</tt> || 19 || + || + || X || + || X || V || 1 || + || tmp := a - (I+D), xf := (I+D).5, yf = (I+D).3
 +
|-
 +
| cpd || <tt>11101101 10101001</tt> || 16 || + || + || X || + || X || C || 1 || - || tmp := a - (hl) => flags, bc -= 1, hl -= 1,<br>xf := [tmp - hf].1, yf = [tmp - hf].3
 +
|-
 +
| cpdr || <tt>11101101 10111001</tt> || 21/16 || + || + || X || + || X || C || 1 || - || cpd, if bc <> 0 and nz then pc -= 2
 +
|-
 +
| cpi || <tt>11101101 10100001</tt> || 16 || + || + || X || + || X || C || 1 || - || tmp := a - (hl) => flags, bc -= 1, hl += 1,<br>xf := [tmp - hf].1, yf = [tmp - hf].3
 +
|-
 +
| cpir || <tt>11101101 10110001</tt> || 21/16 || + || + || X || + || X || C || 1 || - || cpi, if bc <> 0 and nz then pc -= 2
 +
|-
 +
| cpl || <tt>00101111</tt> || 4 || - || - || + || 1 || + || - || 1 || - || a := ~a
 +
|-
 +
| daa || <tt>00100111</tt> || 4 || + || + || + || X || + || P || - || X || tmp := a,<br>if nf then<br>&nbsp;if hf or [a AND 0x0f > 9] then tmp -= 0x06<br>&nbsp;if cf or [a > 0x99] then tmp -= 0x60<br>else<br>&nbsp;if hf or [a AND 0x0f > 9] then tmp += 0x06<br>&nbsp;if cf or [a > 0x99] then tmp += 0x60<br>endif,<br>tmp => flags, cf := cf OR [a > 0x99],<br>hf := a.4 XOR tmp.4, a := tmp
 +
|-
 +
| dec R || <tt>00rrr101</tt> || 4 || + || + || + || + || + || V || 1 || - || R -= 1
 +
|-
 +
| dec J || <tt>11i11101 0010b101</tt> || 8 || + || + || + || + || + || V || 1 || - || J -= 1
 +
|-
 +
| dec (hl) || <tt>00110101</tt> || 11 || + || + || + || + || + || V || 1 || - || (hl) -= 1
 +
|-
 +
| dec (I+D) || <tt>11i11101 00110101 dddddddd</tt> || 19 || + || + || + || + || + || V || 1 || - || (I+D) -= 1
 +
|-
 +
| dec Q || <tt>00qq1011</tt> || 6 || - || - || - || - || - || - || - || - || Q -= 1
 +
|-
 +
| dec I || <tt>11i11101 00101011</tt> || 10 || - || - || - || - || - || - || - || - || I -= 1
 +
|-
 +
| di || <tt>11110011</tt> || 4 || - || - || - || - || - || - || - || - || iff1 := 0, iff2 := 0
 +
|-
 +
| djnz E || <tt>00010000 dddddddd</tt> || 13/8 || - || - || - || - || - || - || - || - || b -= 1, if b <> 0 then pc := E
 +
|-
 +
| ei || <tt>11111011</tt> || 4 || - || - || - || - || - || - || - || - || iff1 := 1, iff2 := 1 after the next instruction
 +
|-
 +
| ex (sp),hl || <tt>11100011</tt> || 19 || - || - || - || - || - || - || - || - || (sp) <=> hl
 +
|-
 +
| ex (sp),I || <tt>11i11101 11100011</tt> || 23 || - || - || - || - || - || - || - || - || (sp) <=> I
 +
|-
 +
| ex af,af' || <tt>00001000</tt> || 4 || X || X || X || X || X || X || X || X || af <=> af'
 +
|-
 +
| ex de,hl || <tt>11101011</tt> || 4 || - || - || - || - || - || - || - || - || de <=> hl
 +
|-
 +
| exx || <tt>11011001</tt> || 4 || - || - || - || - || - || - || - || - || bc, de, hl <=> bc', de', hl'
 +
|-
 +
| halt || <tt>01110110</tt> || 4 || - || - || - || - || - || - || - || - || wait for interrupt
 +
|-
 +
| im 0 || <tt>11101101 01*0*110</tt> || 8 || - || - || - || - || - || - || - || - || mode 0: execute instruction on bus
 +
|-
 +
| im 1 || <tt>11101101 01*10110</tt> || 8 || - || - || - || - || - || - || - || - || mode 1: execute rst $38
 +
|-
 +
| im 2 || <tt>11101101 01*11110</tt> || 8 || - || - || - || - || - || - || - || - || mode 2: call (i * 256 + byte on bus)
 +
|-
 +
| in a,(N) || <tt>11011011 nnnnnnnn</tt> || 11 || - || - || - || - || - || - || - || - || a := ((N))
 +
|-
 +
| in R,(c) || <tt>11101101 01rrr000</tt> || 12 || + || + || + || 0 || + || P || 0 || - || R := ((c))
 +
|-
 +
| in f,(c) || <tt>11101101 01110000</tt> || 12 || + || + || + || 0 || + || P || 0 || - || tmp := ((c))
 +
|-
 +
| inc R || <tt>00rrr100</tt> || 4 || + || + || + || + || + || V || 0 || - || R += 1
 +
|-
 +
| inc J || <tt>11i11101 0010b100</tt> || 8 || + || + || + || + || + || V || 0 || - || J += 1
 +
|-
 +
| inc (hl) || <tt>00110100</tt> || 11 || + || + || + || + || + || V || 0 || - || (hl) += 1
 +
|-
 +
| inc (I+D) || <tt>11i11101 00110100 dddddddd</tt> || 23 || + || + || + || + || + || V || 0 || - || (I+D) += 1
 +
|-
 +
| inc Q || <tt>00qq0011</tt> || 6 || - || - || - || - || - || - || - || - || Q += 1
 +
|-
 +
| inc I || <tt>11i11101 00100011</tt> || 10 || - || - || - || - || - || - || - || - || I += 1
 +
|-
 +
| ind || <tt>11101101 10101010</tt> || 16 || + || + || + || X || + || X || X || X || tmp := ((c)), (hl) := tmp, hl -= 1,<br>b -= 1 => flags, nf := tmp.7,<br>tmp2 = tmp + [[c - 1] AND 0xff],<br>pf := parity of [[tmp2 AND 0x07] XOR b],<br>hf := cf := tmp2 > 255
 +
|-
 +
| indr || <tt>11101101 10111010</tt> || 21/16 || + || + || + || X || + || X || X || X || ind, if b <> 0 then pc -= 2
 +
|-
 +
| ini || <tt>11101101 10100010</tt> || 16 || + || + || + || X || + || X || X || X || tmp := ((c)), (hl) := tmp, hl += 1,<br>b -= 1 => flags, nf := tmp.7,<br>tmp2 := tmp + [[c + 1] AND 0xff],<br>pf := parity of [[tmp2 AND 0x07] XOR b],<br>hf := cf := tmp2 > 255
 +
|-
 +
| inir || <tt>11101101 10110010</tt> || 21/16 || + || + || + || X || + || X || X || X || ini, if b <> 0 then pc -= 2
 +
|-
 +
| jp A || <tt>11000011 alalalal ahahahah</tt> || 10 || - || - || - || - || - || - || - || - || pc := A
 +
|-
 +
| jp (hl) || <tt>11101001</tt> || 4 || - || - || - || - || - || - || - || - || pc := hl
 +
|-
 +
| jp (I) || <tt>11i11101 11101001</tt> || 8 || - || - || - || - || - || - || - || - || pc := I
 +
|-
 +
| jp C,A || <tt>11ccc010 alalalal ahahahah</tt> || 10 || - || - || - || - || - || - || - || - || if C then pc := A
 +
|-
 +
| jr E || <tt>00011000 dddddddd</tt> || 12 || - || - || - || - || - || - || - || - || pc := E
 +
|-
 +
| jr nz,E || <tt>00100000 dddddddd</tt> || 12/7 || - || - || - || - || - || - || - || - || if nz then pc := E
 +
|-
 +
| jr z,E || <tt>00101000 dddddddd</tt> || 12/7 || - || - || - || - || - || - || - || - || if zf then pc := E
 +
|-
 +
| jr nc,E || <tt>00110000 dddddddd</tt> || 12/7 || - || - || - || - || - || - || - || - || if nc then pc := E
 +
|-
 +
| jr c,E || <tt>00111000 dddddddd</tt> || 12/7 || - || - || - || - || - || - || - || - || if cf then pc := E
 +
|-
 +
| ld R1,R2 || <tt>01rrrsss</tt> || 4 || - || - || - || - || - || - || - || - || R1 := R2
 +
|-
 +
| ld R,J || <tt>11i11101 01rrr10b</tt> || 8 || - || - || - || - || - || - || - || - || R := J
 +
|-
 +
| ld J,R || <tt>11i11101 0110brrr</tt> || 8 || - || - || - || - || - || - || - || - || J := R
 +
|-
 +
| ld ixh,ixl || <tt>11011101 01100101</tt> || 8 || - || - || - || - || - || - || - || - || ixh := ixl
 +
|-
 +
| ld ixl,ixh || <tt>11011101 01101100</tt> || 8 || - || - || - || - || - || - || - || - || ixl := ixh
 +
|-
 +
| ld iyh,iyl || <tt>11111101 01100101</tt> || 8 || - || - || - || - || - || - || - || - || iyh := iyl
 +
|-
 +
| ld iyl,iyh || <tt>11111101 01101100</tt> || 8 || - || - || - || - || - || - || - || - || iyl := iyh
 +
|-
 +
| ld R,N || <tt>00rrr110 nnnnnnnn</tt> || 7 || - || - || - || - || - || - || - || - || R := N
 +
|-
 +
| ld R,(hl) || <tt>01rrr110</tt> || 7 || - || - || - || - || - || - || - || - || R := (hl)
 +
|-
 +
| ld R,(I+D) || <tt>11i11101 01rrr110 dddddddd</tt> || 19 || - || - || - || - || - || - || - || - || R := (I+D)
 +
|-
 +
| ld (hl),R || <tt>01110rrr</tt> || 7 || - || - || - || - || - || - || - || - || (hl) := R
 +
|-
 +
| ld (hl),N || <tt>00110110 nnnnnnnn</tt> || 10 || - || - || - || - || - || - || - || - || (hl) := N
 +
|-
 +
| ld (I+D),R || <tt>11i11101 01110rrr dddddddd</tt> || 19 || - || - || - || - || - || - || - || - || (I+D) := R
 +
|-
 +
| ld (I+D),N || <tt>11i11101 00110110 dddddddd nnnnnnnn</tt> || 19 || - || - || - || - || - || - || - || - || (I+D) := N
 +
|-
 +
| ld a,(bc) || <tt>00001010</tt> || 7 || - || - || - || - || - || - || - || - || a := (bc)
 +
|-
 +
| ld a,(de) || <tt>00011010</tt> || 7 || - || - || - || - || - || - || - || - || a := (de)
 +
|-
 +
| ld a,(A) || <tt>00111010 alalalal ahahahah</tt> || 13 || - || - || - || - || - || - || - || - || a := (A)
 +
|-
 +
| ld (bc),a || <tt>00000010</tt> || 7 || - || - || - || - || - || - || - || - || (bc) := a
 +
|-
 +
| ld (de),a || <tt>00010010</tt> || 7 || - || - || - || - || - || - || - || - || (de) := a
 +
|-
 +
| ld (A),a || <tt>00110010 alalalal ahahahah</tt> || 13 || - || - || - || - || - || - || - || - || (A) := a
 +
|-
 +
| ld i,a || <tt>11101101 01000111</tt> || 9 || - || - || - || - || - || - || - || - || i := a
 +
|-
 +
| ld r,a || <tt>11101101 01001111</tt> || 9 || - || - || - || - || - || - || - || - || r := a
 +
|-
 +
| ld a,i || <tt>11101101 01010111</tt> || 9 || + || + || + || 0 || + || X || 0 || - || a := i, pf := iff2
 +
|-
 +
| ld a,r || <tt>11101101 01011111</tt> || 9 || + || + || + || 0 || + || X || 0 || - || a := r, pf := iff2
 +
|-
 +
| ld Q,A || <tt>00qq0001 alalalal ahahahah</tt> || 10 || - || - || - || - || - || - || - || - || Q := A
 +
|-
 +
| ld I,A || <tt>11i11101 00100001 alalalal ahahahah</tt> || 14 || - || - || - || - || - || - || - || - || I := A
 +
|-
 +
| ld Q,(A) || <tt>11101101 01qq1011 alalalal ahahahah</tt> || 20 || - || - || - || - || - || - || - || - || Q := (A) [Q shouldn't be hl, see below]
 +
|-
 +
| ld hl,(A) || <tt>00101010 alalalal ahahahah</tt> || 20 || - || - || - || - || - || - || - || - || hl := (A)
 +
|-
 +
| ld I,(A) || <tt>11i11101 00101010 alalalal ahahahah</tt> || 20 || - || - || - || - || - || - || - || - || I := (A)
 +
|-
 +
| ld (A),Q || <tt>11101101 01qq0011 alalalal ahahahah</tt> || 20 || - || - || - || - || - || - || - || - || (A) := Q [Q shouldn't be hl, see below]
 +
|-
 +
| ld (A),hl || <tt>00100010 alalalal ahahahah</tt> || 20 || - || - || - || - || - || - || - || - || (A) := hl
 +
|-
 +
| ld (A),I || <tt>11i11101 00100010 alalalal ahahahah</tt> || 20 || - || - || - || - || - || - || - || - || (A) := I
 +
|-
 +
| ld sp,hl || <tt>11111001</tt> || 6 || - || - || - || - || - || - || - || - || sp := hl
 +
|-
 +
| ld sp,I || <tt>11i11101 11111001</tt> || 10 || - || - || - || - || - || - || - || - || sp := I
 +
|-
 +
| ldd || <tt>11101101 10101000</tt> || 16 || - || - || X || 0 || X || C || 0 || - || tmp := (hl), (de) := tmp, de -= 1, hl -= 1,<br>bc -= 1, xf := [tmp + a].1, yf = [tmp + a].3
 +
|-
 +
| lddr || <tt>11101101 10111000</tt> || 21/16 || - || - || X || 0 || X || C || 0 || - || ldd, if bc <> 0 then pc -= 2
 +
|-
 +
| ldi || <tt>11101101 10100000</tt> || 16 || - || - || X || 0 || X || C || 0 || - || tmp := (hl), (de) := tmp, de += 1, hl += 1,<br>bc -= 1, xf := [tmp + a].1, yf = [tmp + a].3
 +
|-
 +
| ldir || <tt>11101101 10110000</tt> || 21/16 || - || - || X || 0 || X || C || 0 || - || ldi, if bc <> 0 then pc -= 2
 +
|-
 +
| neg || <tt>11101101 01***100</tt> || 8 || + || + || + || + || + || V || 1 || + || a := 0 - a
 +
|-
 +
| nop || <tt>00000000</tt> || 4 || - || - || - || - || - || - || - || - || nothing
 +
|-
 +
| or R || <tt>10110rrr</tt> || 4 || + || + || + || 0 || + || P || 0 || 0 || a := a OR R
 +
|-
 +
| or J || <tt>11i11101 1011010b</tt> || 8 || + || + || + || 0 || + || P || 0 || 0 || a := a OR J
 +
|-
 +
| or N || <tt>11110110 nnnnnnnn</tt> || 7 || + || + || + || 0 || + || P || 0 || 0 || a := a OR N
 +
|-
 +
| or (hl) || <tt>10110110</tt> || 7 || + || + || + || 0 || + || P || 0 || 0 || a := a OR (hl)
 +
|-
 +
| or (I+D) || <tt>11i11101 10110110 dddddddd</tt> || 19 || + || + || + || 0 || + || P || 0 || 0 || a := a OR (I+D)
 +
|-
 +
| out (N),a || <tt>11010011 nnnnnnnn</tt> || 11 || - || - || - || - || - || - || - || - || ((N)) := a
 +
|-
 +
| out (c),R || <tt>11101101 01rrr001</tt> || 12 || - || - || - || - || - || - || - || - || ((c)) := R
 +
|-
 +
| out (c),0 || <tt>11101101 01110001</tt> || 12 || - || - || - || - || - || - || - || - || ((c)) := ? (seems to vary with CPU)
 +
|-
 +
| outd || <tt>11101101 10101011</tt> || 16 || + || + || + || X || + || X || X || X || tmp := (hl), ((c)) := tmp, hl -= 1,<br>b -= 1 => flags, nf := tmp.7, tmp2 = tmp + l,<br>pf := parity of [[tmp2 AND 0x07] XOR b],<br>hf := cf := tmp2 > 255
 +
|-
 +
| otdr || <tt>11101101 10111011</tt> || 21/16 || + || + || + || X || + || X || X || X || outd, if b <> 0 then pc -= 2
 +
|-
 +
| outi || <tt>11101101 10100011</tt> || 16 || + || + || + || X || + || X || X || X || tmp := (hl), ((c)) := tmp, hl += 1,<br>b -= 1 => flags, nf := tmp.7, tmp2 = tmp + l,<br>pf := parity of [[tmp2 AND 0x07] XOR b],<br>hf := cf := tmp2 > 255
 +
|-
 +
| otir || <tt>11101101 10110011</tt> || 21/16 || + || + || + || X || + || X || X || X || outi, if b <> 0 then pc -= 2
 +
|-
 +
| pop P || <tt>11pp0001</tt> || 10 || - || - || - || - || - || - || - || - || P := (sp), sp += 2
 +
|-
 +
| pop I || <tt>11i11101 11100001</tt> || 14 || - || - || - || - || - || - || - || - || I := (sp), sp += 2
 +
|-
 +
| push P || <tt>11pp0101</tt> || 11 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := P
 +
|-
 +
| push I || <tt>11i11101 11100101</tt> || 15 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := I
 +
|-
 +
| res B,R || <tt>11001011 10bbbrrr</tt> || 8 || - || - || - || - || - || - || - || - || R := R AND ~[1 << B]
 +
|-
 +
| res B,(hl) || <tt>11001011 10bbb110</tt> || 15 || - || - || - || - || - || - || - || - || (hl) := (hl) AND ~[1 << B]
 +
|-
 +
| res B,(I+D) || <tt>11i11101 11001011 dddddddd 10bbb110</tt> || 23 || - || - || - || - || - || - || - || - || (I+D) := (I+D) AND ~[1 << B]
 +
|-
 +
| res B,(I+D)->R || <tt>11i11101 11001011 dddddddd 10bbbrrr</tt> || 23 || - || - || - || - || - || - || - || - || (I+D) := R := (I+D) AND ~[1 << B]
 
|-
 
|-
 
| ret || <tt>11001001</tt> || 10 || - || - || - || - || - || - || - || - || pc := (sp), sp += 2
 
| ret || <tt>11001001</tt> || 10 || - || - || - || - || - || - || - || - || pc := (sp), sp += 2
 +
|-
 +
| ret C || <tt>11ccc000</tt> || 11/5 || - || - || - || - || - || - || - || - || if C then pc := (sp), sp += 2
 +
|-
 +
| reti || <tt>11101101 01**1101</tt> || 14 || - || - || - || - || - || - || - || - || pc := (sp), sp += 2, iff1 := iff2
 +
|-
 +
| retn || <tt>11101101 01**0101</tt> || 14 || - || - || - || - || - || - || - || - || pc := (sp), sp += 2, iff1 := iff2
 +
|-
 +
| rla || <tt>00010111</tt> || 4 || - || - || + || 0 || + || - || 0 || X || ocf := cf, cf := a.7, a := [a << 1] + ocf
 +
|-
 +
| rl R || <tt>11001011 00010rrr</tt> || 8 || + || + || + || 0 || + || P || 0 || X || ocf := cf, cf := R.7, R := [R << 1] + ocf
 +
|-
 +
| rl (hl) || <tt>11001011 00010110</tt> || 15 || + || + || + || 0 || + || P || 0 || X || ocf := cf, cf := (hl).7, (hl) := [(hl) << 1] + ocf
 +
|-
 +
| rl (I+D) || <tt>11i11101 11001011 dddddddd 00010110</tt> || 23 || + || + || + || 0 || + || P || 0 || X || ocf := cf, cf := (I+D).7,<br>(I+D) := [(I+D) << 1] + ocf
 +
|-
 +
| rl (I+D)->R || <tt>11i11101 11001011 dddddddd 00010rrr</tt> || 23 || + || + || + || 0 || + || P || 0 || X || ocf := cf, cf := (I+D).7,<br>(I+D) := R := [(I+D) << 1] + ocf
 +
|-
 +
| rlca || <tt>00000111</tt> || 4 || - || - || + || 0 || + || - || 0 || X || cf := a.7, a := [a << 1] + cf
 +
|-
 +
| rlc R || <tt>11001011 00000rrr</tt> || 8 || + || + || + || 0 || + || P || 0 || X || cf := R.7, R := [R << 1] + cf
 +
|-
 +
| rlc (hl) || <tt>11001011 00000110</tt> || 15 || + || + || + || 0 || + || P || 0 || X || cf := (hl).7, (hl) := [(hl) << 1] + cf
 +
|-
 +
| rlc (I+D) || <tt>11i11101 11001011 dddddddd 00000110</tt> || 23 || + || + || + || 0 || + || P || 0 || X || cf := (I+D).7, (I+D) := [(I+D) << 1] + cf
 +
|-
 +
| rlc (I+D)->R || <tt>11i11101 11001011 dddddddd 00000rrr</tt> || 23 || + || + || + || 0 || + || P || 0 || X || cf := (I+D).7, (I+D) := R := [(I+D) << 1] + cf
 +
|-
 +
| rld || <tt>11101101 01101111</tt> || 18 || + || + || + || 0 || + || P || 0 || - || tmp := [(hl) << 4] + [a AND 0x0f], (hl) := tmp,<br>a := [a AND 0xf0] + [tmp >> 8] => flags
 +
|-
 +
| rra || <tt>00011111</tt> || 4 || - || - || + || 0 || + || - || 0 || X || ocf := cf, cf := a.0, a := [a >> 1] + [ocf << 7]
 +
|-
 +
| rr R || <tt>11001011 00011rrr</tt> || 8 || + || + || + || 0 || + || P || 0 || X || ocf := cf, cf := R.0, R := [R >> 1] + [ocf << 7]
 +
|-
 +
| rr (hl) || <tt>11001011 00011110</tt> || 15 || + || + || + || 0 || + || P || 0 || X || ocf := cf, cf := (hl).0,<br>(hl) := [(hl) >> 1] + [ocf << 7]
 +
|-
 +
| rr (I+D) || <tt>11i11101 11001011 dddddddd 00011110</tt> || 23 || + || + || + || 0 || + || P || 0 || X || ocf := cf, cf := (I+D).0,<br>(I+D) := [(I+D) >> 1] + [ocf << 7]
 +
|-
 +
| rr (I+D)->R || <tt>11i11101 11001011 dddddddd 00011rrr</tt> || 23 || + || + || + || 0 || + || P || 0 || X || ocf := cf, cf := (I+D).0,<br>(I+D) := R := [(I+D) >> 1] + [ocf << 7]
 +
|-
 +
| rrca || <tt>00001111</tt> || 4 || - || - || + || 0 || + || - || 0 || X || cf := a.0, a := [a >> 1] + [cf << 7]
 +
|-
 +
| rrc R || <tt>11001011 00001rrr</tt> || 8 || + || + || + || 0 || + || P || 0 || X || cf := R.0, R := [R >> 1] + [cf << 7]
 +
|-
 +
| rrc (hl) || <tt>11001011 00001110</tt> || 15 || + || + || + || 0 || + || P || 0 || X || cf := (hl).0, (hl) := [(hl) >> 1] + [cf << 7]
 +
|-
 +
| rrc (I+D) || <tt>11i11101 11001011 dddddddd 00001110</tt> || 23 || + || + || + || 0 || + || P || 0 || X || cf := (I+D).0, (I+D) := [(I+D) >> 1] + [cf << 7]
 +
|-
 +
| rrc (I+D)->R || <tt>11i11101 11001011 dddddddd 00001rrr</tt> || 23 || + || + || + || 0 || + || P || 0 || X || cf := (I+D).0,<br>(I+D) := R := [(I+D) >> 1] + [cf << 7]
 +
|-
 +
| rrd || <tt>11101101 01100111</tt> || 18 || + || + || + || 0 || + || P || 0 || - || tmp := (hl),<br>(hl) := [tmp >> 4] + [[a AND 0x0f] << 4],<br>a := [a AND 0xf0] + [tmp AND 0x0f] => flags
 +
|-
 +
| rst S || <tt>11sss111</tt> || 11 || - || - || - || - || - || - || - || - || sp -= 2, (sp) := pc, pc := S
 +
|-
 +
| sbc a,R || <tt>10011rrr</tt> || 4 || + || + || + || + || + || V || 1 || + || a -= R + cf
 +
|-
 +
| sbc a,J || <tt>11i11101 1001110b</tt> || 8 || + || + || + || + || + || V || 1 || + || a -= J + cf
 +
|-
 +
| sbc a,N || <tt>11011110 nnnnnnnn</tt> || 7 || + || + || + || + || + || V || 1 || + || a -= N + cf
 +
|-
 +
| sbc a,(hl) || <tt>10011110</tt> || 7 || + || + || + || + || + || V || 1 || + || a -= (hl) + cf
 +
|-
 +
| sbc a,(I+D) || <tt>11i11101 10011110 dddddddd</tt> || 19 || + || + || + || + || + || V || 1 || + || a -= (I+D) + cf
 +
|-
 +
| sbc hl,Q || <tt>11101101 01qq0010</tt> || 15 || + || + || + || + || + || V || 1 || + || hl -= Q + cf
 +
|-
 +
| scf || <tt>00110111</tt> || 4 || - || - || A || 0 || A || - || 0 || 1 || nothing else
 +
|-
 +
| set B,R || <tt>11001011 11bbbrrr</tt> || 8 || - || - || - || - || - || - || - || - || R := R OR [1 << B]
 +
|-
 +
| set B,(hl) || <tt>11001011 11bbb110</tt> || 15 || - || - || - || - || - || - || - || - || (hl) := (hl) OR [1 << B]
 +
|-
 +
| set B,(I+D) || <tt>11i11101 11001011 dddddddd 11bbb110</tt> || 23 || - || - || - || - || - || - || - || - || (I+D) := (I+D) OR [1 << B]
 +
|-
 +
| set B,(I+D)->R || <tt>11i11101 11001011 dddddddd 11bbbrrr</tt> || 23 || - || - || - || - || - || - || - || - || (I+D) := R := (I+D) OR [1 << B]
 +
|-
 +
| sla R || <tt>11001011 00100rrr</tt> || 8 || + || + || + || 0 || + || P || 0 || X || cf := R.7, R := R << 1
 +
|-
 +
| sla (hl) || <tt>11001011 00100110</tt> || 15 || + || + || + || 0 || + || P || 0 || X || cf := (hl).7, (hl) := (hl) << 1
 +
|-
 +
| sla (I+D) || <tt>11i11101 11001011 dddddddd 00100110</tt> || 23 || + || + || + || 0 || + || P || 0 || X || cf := (I+D).7, (I+D) := (I+D) << 1
 +
|-
 +
| sla (I+D)->R || <tt>11i11101 11001011 dddddddd 00100rrr</tt> || 23 || + || + || + || 0 || + || P || 0 || X || cf := (I+D).7, (I+D) := R := (I+D) << 1
 +
|-
 +
| sra R || <tt>11001011 00101rrr</tt> || 8 || + || + || + || 0 || + || P || 0 || X || cf := R.0, R := R >> 1, R.7 := R.6
 +
|-
 +
| sra (hl) || <tt>11001011 00101110</tt> || 15 || + || + || + || 0 || + || P || 0 || X || cf := (hl).0, (hl) := (hl) >> 1, (hl).7 := (hl).6
 +
|-
 +
| sra (I+D) || <tt>11i11101 11001011 dddddddd 00101110</tt> || 23 || + || + || + || 0 || + || P || 0 || X || cf := (I+D).0,<br>(I+D) := (I+D) >> 1, (I+D).7 := (I+D).6
 +
|-
 +
| sra (I+D)->R || <tt>11i11101 11001011 dddddddd 00101rrr</tt> || 23 || + || + || + || 0 || + || P || 0 || X || cf := (I+D).0,<br>tmp := (I+D) >> 1, tmp.7 := tmp.6<br>(I+D) := R := tmp
 +
|-
 +
| sll R || <tt>11001011 00110rrr</tt> || 8 || + || + || + || 0 || + || P || 0 || X || cf := R.7, R := [R << 1] + 1
 +
|-
 +
| sll (hl) || <tt>11001011 00110110</tt> || 15 || + || + || + || 0 || + || P || 0 || X || cf := (hl).7, (hl) := [(hl) << 1] + 1
 +
|-
 +
| sll (I+D) || <tt>11i11101 11001011 dddddddd 00110110</tt> || 23 || + || + || + || 0 || + || P || 0 || X || cf := (I+D).7, (I+D) := [(I+D) << 1] + 1
 +
|-
 +
| sll (I+D)->R || <tt>11i11101 11001011 dddddddd 00110rrr</tt> || 23 || + || + || + || 0 || + || P || 0 || X || cf := (I+D).7, (I+D) := R := [(I+D) << 1] + 1
 +
|-
 +
| srl R || <tt>11001011 00111rrr</tt> || 8 || 0 || + || + || 0 || + || P || 0 || X || cf := R.0, R := R >> 1
 +
|-
 +
| srl (hl) || <tt>11001011 00111110</tt> || 15 || 0 || + || + || 0 || + || P || 0 || X || cf := (hl).0, (hl) := (hl) >> 1
 +
|-
 +
| srl (I+D) || <tt>11i11101 11001011 dddddddd 00111110</tt> || 23 || 0 || + || + || 0 || + || P || 0 || X || cf := (I+D).0, (I+D) := (I+D) >> 1
 +
|-
 +
| srl (I+D)->R || <tt>11i11101 11001011 dddddddd 00111rrr</tt> || 23 || 0 || + || + || 0 || + || P || 0 || X || cf := (I+D).0, (I+D) := R := (I+D) >> 1
 +
|-
 +
| sub R || <tt>10010rrr</tt> || 4 || + || + || + || + || + || V || 1 || + || a -= R
 +
|-
 +
| sub J || <tt>11i11101 1001010b</tt> || 8 || + || + || + || + || + || V || 1 || + || a -= J
 +
|-
 +
| sub N || <tt>11010110 nnnnnnnn</tt> || 7 || + || + || + || + || + || V || 1 || + || a -= N
 +
|-
 +
| sub (hl) || <tt>10010110</tt> || 7 || + || + || + || + || + || V || 1 || + || a -= (hl)
 +
|-
 +
| sub (I+D) || <tt>11i11101 10010110 dddddddd</tt> || 19 || + || + || + || + || + || V || 1 || + || a -= (I+D)
 +
|-
 +
| xor R || <tt>10101rrr</tt> || 4 || + || + || + || 0 || + || P || 0 || 0 || a := a XOR R
 +
|-
 +
| xor J || <tt>11i11101 1010110b</tt> || 8 || + || + || + || 0 || + || P || 0 || 0 || a := a XOR J
 +
|-
 +
| xor N || <tt>11101110 nnnnnnnn</tt> || 7 || + || + || + || 0 || + || P || 0 || 0 || a := a XOR N
 +
|-
 +
| xor (hl) || <tt>10101110</tt> || 7 || + || + || + || 0 || + || P || 0 || 0 || a := a XOR (hl)
 +
|-
 +
| xor (I+D) || <tt>11i11101 10101110 dddddddd</tt> || 19 || + || + || + || 0 || + || P || 0 || 0 || a := a XOR (I+D)
 
|}
 
|}
  
 
=== Legend ===
 
=== Legend ===
−
{| border=1 cellspacing=0 cellpadding=2
+
{| border="1" cellspacing="0" cellpadding="2"
 
! Notation !! Meaning !! Respective opcode bits
 
! Notation !! Meaning !! Respective opcode bits
 
|-
 
|-
−
| A || 16-bit address || Al - low byte, Ah - high byte
+
| A || 16-bit address or immediate || alalalal ahahahah
 
|-
 
|-
−
| P || 16-bit register pair: bc, de, hl, af || 00, 01, 10, 11
+
| B || Bit number: 0..7 || bbb = 000..111
 
|-
 
|-
−
| Q || 16-bit register: bc, de, hl, sp || 00, 01, 10, 11
+
| C || Condition: nz, z, nc, c, po, pe, p, m || ccc = 000, 001, 010, 011, 100, 101, 110, 111
 
|-
 
|-
−
| R || 8-bit general purpose register: a, b, c, d, e, h, l || 111, 000, 001, 010, 011, 100, 101
+
| D || 8-bit signed relative offset || dddddddd
 +
|-
 +
| E || 16-bit relative address || dddddddd (E minus address of next instruction)
 +
|-
 +
| I || Index register: ix, iy || i = 0, 1
 +
|-
 +
| J || Half index register: ixh, ixl, iyh, iyl || (i, b) = (0, 0), (0, 1), (1, 0), (1, 1)
 +
|-
 +
| N || 8-bit immediate || nnnnnnnn
 +
|-
 +
| P || 16-bit register pair: bc, de, hl, af || pp = 00, 01, 10, 11
 +
|-
 +
| Q || 16-bit register: bc, de, hl/ix/iy, sp || qq = 00, 01, 10, 11
 +
|-
 +
| R || 8-bit general purpose register: a, b, c, d, e, h, l || rrr (or sss) = 111, 000, 001, 010, 011, 100, 101
 +
|-
 +
| S || Restart address: 0x00, 0x08,..., 0x38 || sss = 000, 001,..., 111
 
|}
 
|}
  
 
=== Flags ===
 
=== Flags ===
 
* - = no change
 
* - = no change
 +
* + = change by definition (if noted, by the operation marked with '=> flags', otherwise by the only non-single-bit operation):
 +
** S = sign, bit 7 of the result byte (accumulator or high byte for 16-bit operations)
 +
** Z = zero, set if the result is zero (8 or 16-bit value)
 +
** X = undocumented, bit 5 of the result byte
 +
** H = half-carry, the carry (theoretical bit 4) of the low nibble of the result byte
 +
** Y = undocumented, bit 3 of the result byte
 +
** P = parity (set if the result byte has an even number of bits set) or overflow (set when crossing the boundary of the signed range); always specified
 +
** N = negative, set if the previous operation was a subtraction; always specified
 +
** C = carry, the theoretical bit 8 of the result byte
 
* 0 = always reset
 
* 0 = always reset
 
* 1 = always set
 
* 1 = always set
−
* X = change, described under Effect
+
* X = change described under Effect
−
* v = OR with the respective bit of the accumulator
+
* P = parity (only for the parity flag)
 +
* V = overflow (only for the parity flag)
 +
* A = OR with the respective bit of the accumulator
 +
* C = set if the counter (bc) is nonzero after decrementing
 +
 
 +
=== Miscellaneous ===
 +
* () = indirection
 +
* (()) = I/O port
 +
* [] = operator precedence (to avoid confusion with indirection)
 +
* E.B = the Bth bit of the value of expression E
 +
* &#42; = any bit value (0 or 1)
 +
* memptr = an internal 16-bit register connected to 16-bit operations
 +
* tmp, tmp2 = temporary storage whose value is thrown away after each instruction

Latest revision as of 00:50, 7 March 2006

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Z80 instruction set

Reference

Instruction Opcode Time S Z X H Y P N C Effect
adc a,R 10001rrr 4 + + + + + V 0 + a += R + cf
adc a,J 11i11101 1000110b 8 + + + + + V 0 + a += J + cf
adc a,N 11001110 nnnnnnnn 7 + + + + + V 0 + a += N + cf
adc a,(hl) 10001110 7 + + + + + V 0 + a += (hl) + cf
adc a,(I+D) 11i11101 10001110 dddddddd 19 + + + + + V 0 + a += (I+D) + cf
adc hl,Q 11101101 01qq1010 15 + + + + + V 0 + hl += Q + cf
add a,R 10000rrr 4 + + + + + V 0 + a += R
add a,J 11i11101 1000010b 8 + + + + + V 0 + a += J
add a,N 11000110 nnnnnnnn 7 + + + + + V 0 + a += N
add a,(hl) 10000110 7 + + + + + V 0 + a += (hl)
add a,(I+D) 11i11101 10000110 dddddddd 19 + + + + + V 0 + a += (I+D)
add hl,Q 00qq1001 11 - - + + + - 0 + hl += Q
add I,Q 11i11101 00qq1001 15 - - + + + - 0 + I += Q
and R 10100rrr 4 + + + 1 + P 0 0 a := a AND R
and J 11i11101 1010010b 8 + + + 1 + P 0 0 a := a AND J
and N 11100110 nnnnnnnn 7 + + + 1 + P 0 0 a := a AND N
and (hl) 10100110 7 + + + 1 + P 0 0 a := a AND (hl)
and (I+D) 11i11101 10100110 dddddddd 19 + + + 1 + P 0 0 a := a AND (I+D)
bit B,R 11001011 01bbbrrr 8 + + + 1 + P 0 - tmp := R AND [1 << B]
bit B,(hl) 11001011 01bbb110 12 + + X 1 X P 0 - tmp := (hl) AND [1 << B],
xf := memptr.13, yf := memptr.11
bit B,(I+D) 11i11101 11001011 dddddddd 01bbb*** 20 + + X 1 X P 0 - tmp := (I+D) AND [1 << B],
xf := [I+D].13, yf := [I+D].11
call A 11001101 alalalal ahahahah 17 - - - - - - - - sp -= 2, (sp) := pc, pc := A
call C,A 11ccc100 alalalal ahahahah 17/10 - - - - - - - - if C then sp -= 2, (sp) := pc, pc := A
ccf 00111111 4 - - A X A - 0 X hf := cf, cf := ~cf
cp R 10111rrr 4 + + X + X V 1 + tmp := a - R, xf := R.5, yf = R.3
cp J 11i11101 1011110b 8 + + X + X V 1 + tmp := a - J, xf := J.5, yf = J.3
cp N 11111110 nnnnnnnn 7 + + X + X V 1 + tmp := a - N, xf := N.5, yf = N.3
cp (hl) 10111110 7 + + X + X V 1 + tmp := a - (hl), xf := (hl).5, yf = (hl).3
cp (I+D) 11i11101 10111110 dddddddd 19 + + X + X V 1 + tmp := a - (I+D), xf := (I+D).5, yf = (I+D).3
cpd 11101101 10101001 16 + + X + X C 1 - tmp := a - (hl) => flags, bc -= 1, hl -= 1,
xf := [tmp - hf].1, yf = [tmp - hf].3
cpdr 11101101 10111001 21/16 + + X + X C 1 - cpd, if bc <> 0 and nz then pc -= 2
cpi 11101101 10100001 16 + + X + X C 1 - tmp := a - (hl) => flags, bc -= 1, hl += 1,
xf := [tmp - hf].1, yf = [tmp - hf].3
cpir 11101101 10110001 21/16 + + X + X C 1 - cpi, if bc <> 0 and nz then pc -= 2
cpl 00101111 4 - - + 1 + - 1 - a := ~a
daa 00100111 4 + + + X + P - X tmp := a,
if nf then
 if hf or [a AND 0x0f > 9] then tmp -= 0x06
 if cf or [a > 0x99] then tmp -= 0x60
else
 if hf or [a AND 0x0f > 9] then tmp += 0x06
 if cf or [a > 0x99] then tmp += 0x60
endif,
tmp => flags, cf := cf OR [a > 0x99],
hf := a.4 XOR tmp.4, a := tmp
dec R 00rrr101 4 + + + + + V 1 - R -= 1
dec J 11i11101 0010b101 8 + + + + + V 1 - J -= 1
dec (hl) 00110101 11 + + + + + V 1 - (hl) -= 1
dec (I+D) 11i11101 00110101 dddddddd 19 + + + + + V 1 - (I+D) -= 1
dec Q 00qq1011 6 - - - - - - - - Q -= 1
dec I 11i11101 00101011 10 - - - - - - - - I -= 1
di 11110011 4 - - - - - - - - iff1 := 0, iff2 := 0
djnz E 00010000 dddddddd 13/8 - - - - - - - - b -= 1, if b <> 0 then pc := E
ei 11111011 4 - - - - - - - - iff1 := 1, iff2 := 1 after the next instruction
ex (sp),hl 11100011 19 - - - - - - - - (sp) <=> hl
ex (sp),I 11i11101 11100011 23 - - - - - - - - (sp) <=> I
ex af,af' 00001000 4 X X X X X X X X af <=> af'
ex de,hl 11101011 4 - - - - - - - - de <=> hl
exx 11011001 4 - - - - - - - - bc, de, hl <=> bc', de', hl'
halt 01110110 4 - - - - - - - - wait for interrupt
im 0 11101101 01*0*110 8 - - - - - - - - mode 0: execute instruction on bus
im 1 11101101 01*10110 8 - - - - - - - - mode 1: execute rst $38
im 2 11101101 01*11110 8 - - - - - - - - mode 2: call (i * 256 + byte on bus)
in a,(N) 11011011 nnnnnnnn 11 - - - - - - - - a := ((N))
in R,(c) 11101101 01rrr000 12 + + + 0 + P 0 - R := ((c))
in f,(c) 11101101 01110000 12 + + + 0 + P 0 - tmp := ((c))
inc R 00rrr100 4 + + + + + V 0 - R += 1
inc J 11i11101 0010b100 8 + + + + + V 0 - J += 1
inc (hl) 00110100 11 + + + + + V 0 - (hl) += 1
inc (I+D) 11i11101 00110100 dddddddd 23 + + + + + V 0 - (I+D) += 1
inc Q 00qq0011 6 - - - - - - - - Q += 1
inc I 11i11101 00100011 10 - - - - - - - - I += 1
ind 11101101 10101010 16 + + + X + X X X tmp := ((c)), (hl) := tmp, hl -= 1,
b -= 1 => flags, nf := tmp.7,
tmp2 = tmp + [[c - 1] AND 0xff],
pf := parity of [[tmp2 AND 0x07] XOR b],
hf := cf := tmp2 > 255
indr 11101101 10111010 21/16 + + + X + X X X ind, if b <> 0 then pc -= 2
ini 11101101 10100010 16 + + + X + X X X tmp := ((c)), (hl) := tmp, hl += 1,
b -= 1 => flags, nf := tmp.7,
tmp2 := tmp + [[c + 1] AND 0xff],
pf := parity of [[tmp2 AND 0x07] XOR b],
hf := cf := tmp2 > 255
inir 11101101 10110010 21/16 + + + X + X X X ini, if b <> 0 then pc -= 2
jp A 11000011 alalalal ahahahah 10 - - - - - - - - pc := A
jp (hl) 11101001 4 - - - - - - - - pc := hl
jp (I) 11i11101 11101001 8 - - - - - - - - pc := I
jp C,A 11ccc010 alalalal ahahahah 10 - - - - - - - - if C then pc := A
jr E 00011000 dddddddd 12 - - - - - - - - pc := E
jr nz,E 00100000 dddddddd 12/7 - - - - - - - - if nz then pc := E
jr z,E 00101000 dddddddd 12/7 - - - - - - - - if zf then pc := E
jr nc,E 00110000 dddddddd 12/7 - - - - - - - - if nc then pc := E
jr c,E 00111000 dddddddd 12/7 - - - - - - - - if cf then pc := E
ld R1,R2 01rrrsss 4 - - - - - - - - R1 := R2
ld R,J 11i11101 01rrr10b 8 - - - - - - - - R := J
ld J,R 11i11101 0110brrr 8 - - - - - - - - J := R
ld ixh,ixl 11011101 01100101 8 - - - - - - - - ixh := ixl
ld ixl,ixh 11011101 01101100 8 - - - - - - - - ixl := ixh
ld iyh,iyl 11111101 01100101 8 - - - - - - - - iyh := iyl
ld iyl,iyh 11111101 01101100 8 - - - - - - - - iyl := iyh
ld R,N 00rrr110 nnnnnnnn 7 - - - - - - - - R := N
ld R,(hl) 01rrr110 7 - - - - - - - - R := (hl)
ld R,(I+D) 11i11101 01rrr110 dddddddd 19 - - - - - - - - R := (I+D)
ld (hl),R 01110rrr 7 - - - - - - - - (hl) := R
ld (hl),N 00110110 nnnnnnnn 10 - - - - - - - - (hl) := N
ld (I+D),R 11i11101 01110rrr dddddddd 19 - - - - - - - - (I+D) := R
ld (I+D),N 11i11101 00110110 dddddddd nnnnnnnn 19 - - - - - - - - (I+D) := N
ld a,(bc) 00001010 7 - - - - - - - - a := (bc)
ld a,(de) 00011010 7 - - - - - - - - a := (de)
ld a,(A) 00111010 alalalal ahahahah 13 - - - - - - - - a := (A)
ld (bc),a 00000010 7 - - - - - - - - (bc) := a
ld (de),a 00010010 7 - - - - - - - - (de) := a
ld (A),a 00110010 alalalal ahahahah 13 - - - - - - - - (A) := a
ld i,a 11101101 01000111 9 - - - - - - - - i := a
ld r,a 11101101 01001111 9 - - - - - - - - r := a
ld a,i 11101101 01010111 9 + + + 0 + X 0 - a := i, pf := iff2
ld a,r 11101101 01011111 9 + + + 0 + X 0 - a := r, pf := iff2
ld Q,A 00qq0001 alalalal ahahahah 10 - - - - - - - - Q := A
ld I,A 11i11101 00100001 alalalal ahahahah 14 - - - - - - - - I := A
ld Q,(A) 11101101 01qq1011 alalalal ahahahah 20 - - - - - - - - Q := (A) [Q shouldn't be hl, see below]
ld hl,(A) 00101010 alalalal ahahahah 20 - - - - - - - - hl := (A)
ld I,(A) 11i11101 00101010 alalalal ahahahah 20 - - - - - - - - I := (A)
ld (A),Q 11101101 01qq0011 alalalal ahahahah 20 - - - - - - - - (A) := Q [Q shouldn't be hl, see below]
ld (A),hl 00100010 alalalal ahahahah 20 - - - - - - - - (A) := hl
ld (A),I 11i11101 00100010 alalalal ahahahah 20 - - - - - - - - (A) := I
ld sp,hl 11111001 6 - - - - - - - - sp := hl
ld sp,I 11i11101 11111001 10 - - - - - - - - sp := I
ldd 11101101 10101000 16 - - X 0 X C 0 - tmp := (hl), (de) := tmp, de -= 1, hl -= 1,
bc -= 1, xf := [tmp + a].1, yf = [tmp + a].3
lddr 11101101 10111000 21/16 - - X 0 X C 0 - ldd, if bc <> 0 then pc -= 2
ldi 11101101 10100000 16 - - X 0 X C 0 - tmp := (hl), (de) := tmp, de += 1, hl += 1,
bc -= 1, xf := [tmp + a].1, yf = [tmp + a].3
ldir 11101101 10110000 21/16 - - X 0 X C 0 - ldi, if bc <> 0 then pc -= 2
neg 11101101 01***100 8 + + + + + V 1 + a := 0 - a
nop 00000000 4 - - - - - - - - nothing
or R 10110rrr 4 + + + 0 + P 0 0 a := a OR R
or J 11i11101 1011010b 8 + + + 0 + P 0 0 a := a OR J
or N 11110110 nnnnnnnn 7 + + + 0 + P 0 0 a := a OR N
or (hl) 10110110 7 + + + 0 + P 0 0 a := a OR (hl)
or (I+D) 11i11101 10110110 dddddddd 19 + + + 0 + P 0 0 a := a OR (I+D)
out (N),a 11010011 nnnnnnnn 11 - - - - - - - - ((N)) := a
out (c),R 11101101 01rrr001 12 - - - - - - - - ((c)) := R
out (c),0 11101101 01110001 12 - - - - - - - - ((c)) := ? (seems to vary with CPU)
outd 11101101 10101011 16 + + + X + X X X tmp := (hl), ((c)) := tmp, hl -= 1,
b -= 1 => flags, nf := tmp.7, tmp2 = tmp + l,
pf := parity of [[tmp2 AND 0x07] XOR b],
hf := cf := tmp2 > 255
otdr 11101101 10111011 21/16 + + + X + X X X outd, if b <> 0 then pc -= 2
outi 11101101 10100011 16 + + + X + X X X tmp := (hl), ((c)) := tmp, hl += 1,
b -= 1 => flags, nf := tmp.7, tmp2 = tmp + l,
pf := parity of [[tmp2 AND 0x07] XOR b],
hf := cf := tmp2 > 255
otir 11101101 10110011 21/16 + + + X + X X X outi, if b <> 0 then pc -= 2
pop P 11pp0001 10 - - - - - - - - P := (sp), sp += 2
pop I 11i11101 11100001 14 - - - - - - - - I := (sp), sp += 2
push P 11pp0101 11 - - - - - - - - sp -= 2, (sp) := P
push I 11i11101 11100101 15 - - - - - - - - sp -= 2, (sp) := I
res B,R 11001011 10bbbrrr 8 - - - - - - - - R := R AND ~[1 << B]
res B,(hl) 11001011 10bbb110 15 - - - - - - - - (hl) := (hl) AND ~[1 << B]
res B,(I+D) 11i11101 11001011 dddddddd 10bbb110 23 - - - - - - - - (I+D) := (I+D) AND ~[1 << B]
res B,(I+D)->R 11i11101 11001011 dddddddd 10bbbrrr 23 - - - - - - - - (I+D) := R := (I+D) AND ~[1 << B]
ret 11001001 10 - - - - - - - - pc := (sp), sp += 2
ret C 11ccc000 11/5 - - - - - - - - if C then pc := (sp), sp += 2
reti 11101101 01**1101 14 - - - - - - - - pc := (sp), sp += 2, iff1 := iff2
retn 11101101 01**0101 14 - - - - - - - - pc := (sp), sp += 2, iff1 := iff2
rla 00010111 4 - - + 0 + - 0 X ocf := cf, cf := a.7, a := [a << 1] + ocf
rl R 11001011 00010rrr 8 + + + 0 + P 0 X ocf := cf, cf := R.7, R := [R << 1] + ocf
rl (hl) 11001011 00010110 15 + + + 0 + P 0 X ocf := cf, cf := (hl).7, (hl) := [(hl) << 1] + ocf
rl (I+D) 11i11101 11001011 dddddddd 00010110 23 + + + 0 + P 0 X ocf := cf, cf := (I+D).7,
(I+D) := [(I+D) << 1] + ocf
rl (I+D)->R 11i11101 11001011 dddddddd 00010rrr 23 + + + 0 + P 0 X ocf := cf, cf := (I+D).7,
(I+D) := R := [(I+D) << 1] + ocf
rlca 00000111 4 - - + 0 + - 0 X cf := a.7, a := [a << 1] + cf
rlc R 11001011 00000rrr 8 + + + 0 + P 0 X cf := R.7, R := [R << 1] + cf
rlc (hl) 11001011 00000110 15 + + + 0 + P 0 X cf := (hl).7, (hl) := [(hl) << 1] + cf
rlc (I+D) 11i11101 11001011 dddddddd 00000110 23 + + + 0 + P 0 X cf := (I+D).7, (I+D) := [(I+D) << 1] + cf
rlc (I+D)->R 11i11101 11001011 dddddddd 00000rrr 23 + + + 0 + P 0 X cf := (I+D).7, (I+D) := R := [(I+D) << 1] + cf
rld 11101101 01101111 18 + + + 0 + P 0 - tmp := [(hl) << 4] + [a AND 0x0f], (hl) := tmp,
a := [a AND 0xf0] + [tmp >> 8] => flags
rra 00011111 4 - - + 0 + - 0 X ocf := cf, cf := a.0, a := [a >> 1] + [ocf << 7]
rr R 11001011 00011rrr 8 + + + 0 + P 0 X ocf := cf, cf := R.0, R := [R >> 1] + [ocf << 7]
rr (hl) 11001011 00011110 15 + + + 0 + P 0 X ocf := cf, cf := (hl).0,
(hl) := [(hl) >> 1] + [ocf << 7]
rr (I+D) 11i11101 11001011 dddddddd 00011110 23 + + + 0 + P 0 X ocf := cf, cf := (I+D).0,
(I+D) := [(I+D) >> 1] + [ocf << 7]
rr (I+D)->R 11i11101 11001011 dddddddd 00011rrr 23 + + + 0 + P 0 X ocf := cf, cf := (I+D).0,
(I+D) := R := [(I+D) >> 1] + [ocf << 7]
rrca 00001111 4 - - + 0 + - 0 X cf := a.0, a := [a >> 1] + [cf << 7]
rrc R 11001011 00001rrr 8 + + + 0 + P 0 X cf := R.0, R := [R >> 1] + [cf << 7]
rrc (hl) 11001011 00001110 15 + + + 0 + P 0 X cf := (hl).0, (hl) := [(hl) >> 1] + [cf << 7]
rrc (I+D) 11i11101 11001011 dddddddd 00001110 23 + + + 0 + P 0 X cf := (I+D).0, (I+D) := [(I+D) >> 1] + [cf << 7]
rrc (I+D)->R 11i11101 11001011 dddddddd 00001rrr 23 + + + 0 + P 0 X cf := (I+D).0,
(I+D) := R := [(I+D) >> 1] + [cf << 7]
rrd 11101101 01100111 18 + + + 0 + P 0 - tmp := (hl),
(hl) := [tmp >> 4] + [[a AND 0x0f] << 4],
a := [a AND 0xf0] + [tmp AND 0x0f] => flags
rst S 11sss111 11 - - - - - - - - sp -= 2, (sp) := pc, pc := S
sbc a,R 10011rrr 4 + + + + + V 1 + a -= R + cf
sbc a,J 11i11101 1001110b 8 + + + + + V 1 + a -= J + cf
sbc a,N 11011110 nnnnnnnn 7 + + + + + V 1 + a -= N + cf
sbc a,(hl) 10011110 7 + + + + + V 1 + a -= (hl) + cf
sbc a,(I+D) 11i11101 10011110 dddddddd 19 + + + + + V 1 + a -= (I+D) + cf
sbc hl,Q 11101101 01qq0010 15 + + + + + V 1 + hl -= Q + cf
scf 00110111 4 - - A 0 A - 0 1 nothing else
set B,R 11001011 11bbbrrr 8 - - - - - - - - R := R OR [1 << B]
set B,(hl) 11001011 11bbb110 15 - - - - - - - - (hl) := (hl) OR [1 << B]
set B,(I+D) 11i11101 11001011 dddddddd 11bbb110 23 - - - - - - - - (I+D) := (I+D) OR [1 << B]
set B,(I+D)->R 11i11101 11001011 dddddddd 11bbbrrr 23 - - - - - - - - (I+D) := R := (I+D) OR [1 << B]
sla R 11001011 00100rrr 8 + + + 0 + P 0 X cf := R.7, R := R << 1
sla (hl) 11001011 00100110 15 + + + 0 + P 0 X cf := (hl).7, (hl) := (hl) << 1
sla (I+D) 11i11101 11001011 dddddddd 00100110 23 + + + 0 + P 0 X cf := (I+D).7, (I+D) := (I+D) << 1
sla (I+D)->R 11i11101 11001011 dddddddd 00100rrr 23 + + + 0 + P 0 X cf := (I+D).7, (I+D) := R := (I+D) << 1
sra R 11001011 00101rrr 8 + + + 0 + P 0 X cf := R.0, R := R >> 1, R.7 := R.6
sra (hl) 11001011 00101110 15 + + + 0 + P 0 X cf := (hl).0, (hl) := (hl) >> 1, (hl).7 := (hl).6
sra (I+D) 11i11101 11001011 dddddddd 00101110 23 + + + 0 + P 0 X cf := (I+D).0,
(I+D) := (I+D) >> 1, (I+D).7 := (I+D).6
sra (I+D)->R 11i11101 11001011 dddddddd 00101rrr 23 + + + 0 + P 0 X cf := (I+D).0,
tmp := (I+D) >> 1, tmp.7 := tmp.6
(I+D) := R := tmp
sll R 11001011 00110rrr 8 + + + 0 + P 0 X cf := R.7, R := [R << 1] + 1
sll (hl) 11001011 00110110 15 + + + 0 + P 0 X cf := (hl).7, (hl) := [(hl) << 1] + 1
sll (I+D) 11i11101 11001011 dddddddd 00110110 23 + + + 0 + P 0 X cf := (I+D).7, (I+D) := [(I+D) << 1] + 1
sll (I+D)->R 11i11101 11001011 dddddddd 00110rrr 23 + + + 0 + P 0 X cf := (I+D).7, (I+D) := R := [(I+D) << 1] + 1
srl R 11001011 00111rrr 8 0 + + 0 + P 0 X cf := R.0, R := R >> 1
srl (hl) 11001011 00111110 15 0 + + 0 + P 0 X cf := (hl).0, (hl) := (hl) >> 1
srl (I+D) 11i11101 11001011 dddddddd 00111110 23 0 + + 0 + P 0 X cf := (I+D).0, (I+D) := (I+D) >> 1
srl (I+D)->R 11i11101 11001011 dddddddd 00111rrr 23 0 + + 0 + P 0 X cf := (I+D).0, (I+D) := R := (I+D) >> 1
sub R 10010rrr 4 + + + + + V 1 + a -= R
sub J 11i11101 1001010b 8 + + + + + V 1 + a -= J
sub N 11010110 nnnnnnnn 7 + + + + + V 1 + a -= N
sub (hl) 10010110 7 + + + + + V 1 + a -= (hl)
sub (I+D) 11i11101 10010110 dddddddd 19 + + + + + V 1 + a -= (I+D)
xor R 10101rrr 4 + + + 0 + P 0 0 a := a XOR R
xor J 11i11101 1010110b 8 + + + 0 + P 0 0 a := a XOR J
xor N 11101110 nnnnnnnn 7 + + + 0 + P 0 0 a := a XOR N
xor (hl) 10101110 7 + + + 0 + P 0 0 a := a XOR (hl)
xor (I+D) 11i11101 10101110 dddddddd 19 + + + 0 + P 0 0 a := a XOR (I+D)

Legend

Notation Meaning Respective opcode bits
A 16-bit address or immediate alalalal ahahahah
B Bit number: 0..7 bbb = 000..111
C Condition: nz, z, nc, c, po, pe, p, m ccc = 000, 001, 010, 011, 100, 101, 110, 111
D 8-bit signed relative offset dddddddd
E 16-bit relative address dddddddd (E minus address of next instruction)
I Index register: ix, iy i = 0, 1
J Half index register: ixh, ixl, iyh, iyl (i, b) = (0, 0), (0, 1), (1, 0), (1, 1)
N 8-bit immediate nnnnnnnn
P 16-bit register pair: bc, de, hl, af pp = 00, 01, 10, 11
Q 16-bit register: bc, de, hl/ix/iy, sp qq = 00, 01, 10, 11
R 8-bit general purpose register: a, b, c, d, e, h, l rrr (or sss) = 111, 000, 001, 010, 011, 100, 101
S Restart address: 0x00, 0x08,..., 0x38 sss = 000, 001,..., 111

Flags

  • - = no change
  • + = change by definition (if noted, by the operation marked with '=> flags', otherwise by the only non-single-bit operation):
    • S = sign, bit 7 of the result byte (accumulator or high byte for 16-bit operations)
    • Z = zero, set if the result is zero (8 or 16-bit value)
    • X = undocumented, bit 5 of the result byte
    • H = half-carry, the carry (theoretical bit 4) of the low nibble of the result byte
    • Y = undocumented, bit 3 of the result byte
    • P = parity (set if the result byte has an even number of bits set) or overflow (set when crossing the boundary of the signed range); always specified
    • N = negative, set if the previous operation was a subtraction; always specified
    • C = carry, the theoretical bit 8 of the result byte
  • 0 = always reset
  • 1 = always set
  • X = change described under Effect
  • P = parity (only for the parity flag)
  • V = overflow (only for the parity flag)
  • A = OR with the respective bit of the accumulator
  • C = set if the counter (bc) is nonzero after decrementing

Miscellaneous

  • () = indirection
  • (()) = I/O port
  • [] = operator precedence (to avoid confusion with indirection)
  • E.B = the Bth bit of the value of expression E
  • * = any bit value (0 or 1)
  • memptr = an internal 16-bit register connected to 16-bit operations
  • tmp, tmp2 = temporary storage whose value is thrown away after each instruction
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