The 8 bits in the Z80's flag register F are, from b7 to b0:

S (sign)
   Set if the result is negative (most significant bit set)
Z (zero)
   Set if the result is zero
F5
   Undefined and not emulated
H (half carry)
   Set if there is a carry/borrow between the low and high nybbles
F3
   Undefined and not emulated
PV (parity/overflow)
   Set if the result has even parity (logical operations)
   Set if signed overflow has occurred (arithmetic operations)
N (add/subtract)
   Set if the operation is a subtraction
C (carry)
   Set if there is a carry/borrow out (arithmetic operations)
   Set according to the bit moved out (logical operations)

The table below shows the effect of all instructions on F.

? indicates the effect is undefined.
* indicates the effect is non-standard (see the notes).
0 indicates the flag is reset.
1 indicates the flag is set.
- indicates the flag is not affected.
S,Z,H,P,V,N,C indicate the flag is set as above.

r refers to any 8-bit quantity appropriate for that instruction.
s refers to any 16-bit quantity appropriate for that instruction.

Instruction           Flags     Notes
===========           =====     =====

ADD/ADC/SUB/SBC/CP r  SZ?H?VNC  CP is just SUB with the result thrown away
INC/DEC r             SZ?H?VN-

ADD s                 --?*?-0C  H from MSB
ADC/SBC s             SZ?*?VNC  H from MSB
INC/DEC s             --?-?---

AND r                 SZ?1?P00
OR/XOR r              SZ?0?P00

RLCA/RLA/RRCA/RRA     --?0?-0C
RLC/RL/RRC/RR r       SZ?0?P0C
SLA/SLL/SRA/SRL r     SZ?0?P0C  SLL is like SLA except b0 gets set
RRD/RLD               SZ?0?P0-  Flags set on result in A

BIT n,r               *Z?1?*0-  PV as Z, S set only if n=7 and b7 of r set

CCF                   --?*?-0*  C=1-C, H as old C
SCF                   --?0?-01
CPL                   --?1?-1-
NEG                   SZ?H?V1C  A=0-A (Zaks gets C wrong)
DAA                   SZ?*?P-*  H from internal correction, C for cascade BCD

LD A,R/LD A,I         SZ?0?*0-  PV as IFF2 [yaze doesn't affect F?]

LDI/LDIR/LDD/LDIR     --?0?*0-  PV set if BC<>0 [Zilog summ says S,Z mod?]
CPI/CPIR/CPD/CPDR     SZ?H?*1-  PV set if BC<>0, other flags from last CP

IN r,(C)              SZ?0?P0-
INI/INIR/IND/INDR     ?*????1-  Z set if B=0, B is decremented after IN
				[Zilog detail says N affected and C undef?]
OUTI/OTIR/OUTD/OTDR   ?*????1-  Z set if B=0, B is decremented before OUT
				[Zilog detail says N affected and C undef?]

OUT (C),r/OUT (n),A   --?-?---  [Zilog detail says affect F?]

All others            --?-?---  Except for POP AF and EX AF,AF', of course...

1996-02-28