Zero and Carry-flags
--------------------
This appendix shows how the instructions affect the Carry and Zero flags.
The symbols have the following meaning.
- unchanged
* influenced by the outcome of the operation
1 is set to 1
0 resets to 0
+ is set to 1 if A = (HL), and in the
  other case is reset to 0.

Instruction       C    Z
------------------------
ADC               *    *
ADD (8-bit)       *    *
ADD (16-bit)      *    -
AND               0    *
BIT               -    *
CALL              *    *
CCF               *    -
CP                *    *
CPD               -    +
CPDR              -    +
CPI               -    +
CPIR              -    +
CPL               -    -
DAA               *    *
DEC               -    -
DI                -    -
DJNZ              -    -
EI                -    -
EX                -    -
EXX               -    -
HALT              -    -
IM                -    -
IN A(n)           -    -
IN r,(C)          -    *
IND               -    *
INDR              -    1
INI               -    *
INIR              -    1
JP                -    -
JR                -    -
LD A,I            -    *
LD A,R            -    *
LD (all others)   -    -
LDD               -    -
LDDR              -    -
LDI               -    -
LDIR              -    -
NEG               *    *
NOP               -    -
OR                0    *
OTDR              -    1
OTIR              -    1
OUT               -    -
OUTD              -    *
OUTI              -    *
POP               -    -
PUSH              -    -
RES               -    -
RET               -    -
RETI              -    -
RETN              -    -
RL                *    *
RLA               *    -
RLC               *    *
RLCA              *    -
RLD               -    *
RR                *    *
RRA               *    -
RRC               *    *
RRCA              *    -
RRD               -    *
RST               -    -
SBC               *    *
SCF               1    -
SET               -    -
SLA               *    *
SRA               *    *
SRL               *    *
SUB               *    *
XOR               0    *