I created this guide to the Z80 machine code and Assembly instruction set mostly for my own purposes while using a Z80 and the Radio Shack TRS-80's, so thought it might be of use to others when learning or editing code. The guide consists of a series of tables not unlike the original Zilog Z80 Reference Manual, with signifigant changes to make the act of coding or decoding a program less clumbersome. The HTML versions are a little bit cluttered, so I recommend the graphical representations at the end of the page to be printed or followed for the construction of a 3x5 table for use by hand. Use of the tables themselves is un-restricted for non-commercial purposes.
1's |
16's> |
0 |
1 |
2 |
3 |
0 |
JR |
NOP |
DJNZ |
NZ |
NC |
1 |
nn-> |
BC |
DE |
HL |
SP |
2 |
A-> |
(BC) |
(DE) |
(HL) |
(nn) |
3 |
INC |
BC |
DE |
HL |
SP |
4 |
INC |
B |
D |
H |
(HL) |
5 |
DEC |
B |
D |
H |
(HL) |
6 |
n-> |
B |
D |
H |
(HL) |
7 |
|
RLCA |
RLA |
DAA |
SCF |
8 |
JR |
AF<->AF' |
UNC |
Z |
C |
9 |
HL+ |
BC |
DE |
HL |
SP |
A |
->A |
(BC) |
(DE) |
(nn)->(HL) |
(nn) |
B |
DEC |
BC |
DE |
HL |
SP |
C |
INC |
C |
E |
L |
A |
D |
DEC |
C |
E |
L |
A |
E |
n-> |
C |
E |
L |
A |
F |
|
RRCA |
RRA |
CPL |
CCF |
1's |
16's> |
0 |
1 |
2 |
3 |
1's |
16's> |
C |
D |
E |
F |
0 |
RTN |
NZ |
NC |
PO |
NM |
1 |
POP |
BC |
DE |
HL |
AF |
2 |
JMP (nn) |
NZ |
NC |
PO |
NM |
3 |
|
JMP (nn) |
OUT (n) |
HL<->(SP) |
DIS INT |
4 |
CALL (nn) |
NZ |
NC |
PO |
NM |
5 |
PUSH |
BC |
DE |
HL |
AF |
6 |
A/n |
+ |
- |
AND |
OR |
7 |
RST |
00h |
10h |
20h |
30h |
8 |
RTN |
Z |
C |
PE |
M |
9 |
|
RTN |
EXX |
JMP (HL) |
HL->SP |
A |
JMP (nn) |
Z |
C |
PE |
M |
B |
|
CNTL BITS |
IN (n) |
HL<->DE |
ENA INT |
C |
CALL (nn) |
Z |
C |
PE |
M |
D |
|
CALL (nn) |
IX for HL |
Ext Ins |
IY for HL |
E |
A/n |
+/cy |
-/cy |
XOR |
CP |
F |
RST |
08h |
18h |
28h |
38h |
1's |
16's> |
C |
D |
E |
F |
1's |
16's> |
4 |
5 |
6 |
7 |
A |
B |
0 |
IN(c) |
B |
D |
H |
|
LDI |
LDIR |
1 |
OUT(c) |
B |
D |
H |
|
CPI |
CPIR |
2 |
HL-/cy |
BC |
DE |
HL |
SP |
INI |
INIR |
3 |
->(nn) |
BC |
DE |
|
SP |
OUTI |
OUTIR |
4 |
|
NEG |
|
|
|
|
|
5 |
|
RET NMI |
|
|
|
|
|
6 |
|
IM0 |
IM2 |
|
|
|
|
7 |
|
A->I |
I->A |
RRD |
|
|
|
8 |
IN(c) |
C |
E |
L |
A |
LDD |
LDDR |
9 |
OUT(c) |
C |
E |
L |
A |
CPD |
CPDR |
A |
HL+/cy |
BC |
DE |
HL |
SP |
IND |
INDR |
B |
(nn)-> |
BC |
DE |
HL |
SP |
OUTD |
OUTDR |
C |
|
|
|
|
|
|
|
D |
|
RET MI |
|
|
|
|
|
E |
|
|
IM2 |
|
|
|
|
F |
|
A->R |
R->A |
RLD |
|
|
|
1's |
16's> |
4 |
5 |
6 |
7 |
A |
B |
|
source reg |
|
|||||||||||||||
|
operations w/A |
|
B |
C |
D |
E |
H |
L |
(HL) |
A |
|
||||||
|
+/cy |
-/cy |
XOR |
CP |
C |
E |
L |
A |
8 |
9 |
A |
B |
C |
D |
E |
F |
<1's |
|
+ |
- |
AND |
OR |
B |
D |
H |
(HL) |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
<1's |
16's> |
8 |
9 |
A |
B |
4 |
5 |
6 |
7 |
|
||||||||
Ex: 9A=SBC A,D |
move destination |
Note: 76=HALT |
|||||||||||||||
|
Source Reg |
Ex: CB 5A=TEST BIT 3,D |
|||||||||||||||
|
B |
C |
D |
E |
H |
L |
(HL) |
A |
BIT# |
|
|||||||
1's> |
8 |
9 |
A |
B |
C |
D |
E |
F |
1 |
3 |
5 |
7 |
RRC |
RR |
SRA |
SRL |
<ops |
1's> |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
0 |
2 |
4 |
6 |
RLC |
RL |
SLA |
|
<ops |
16's> |
|
SET> |
C |
D |
E |
F |
0 |
1 |
2 |
3 |
<16's |
||||||
16's> |
|
RESET> |
8 |
9 |
A |
B |
|
<16's |
|||||||||
16's> |
|
TEST> |
4 |
5 |
6 |
7 |
|
<16's |
|||||||||
You might want to print this out full page and then cut it apart and paste to 3 by 5 cards for a home-made handy reference.