16-Bit Arithmetic Group

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Mnemonic        Symbolic            Flags (bit 7-0)   Instruction         Number      Number of   Number of   Comments
                operation           S Z . H . V N C   opcode              of bytes    M cycles    T states
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ADD HL,ss       HL <- HL+ss         * * X X X * 0 ?   00 ss1 001          1           3           11          ss:
                                                                                                              00  BC
ADC HL,ss       HL <- HL+ss+CY      ? ? X X X V 0 ?   11 101 101 (EDh)    2           4           15          01  DE
                                                      01 ss1 010                                              10  HL
                                                                                                              11  SP
SBC HL,ss       HL <- HL-ss-CY      ? ? X X X V 1 ?   11 101 101 (EDh)    2           4           15
                                                      01 ss0 010

ADD IX,pp       IX <- IX+pp         * * X X X * 0 ?   11 011 101 (DDh)    2           4           15          pp:
                                                      00 pp1 001                                              00  BC
                                                                                                              01  DE
ADD IY,qq       IY <- IY+qq         * * X X X * 0 ?   11 111 101 (FDh)    2           4           15          10  IX
                                                      00 qq1 001                                              11  SP

                                                                                                              qq:
INC ss          ss <- ss+1          * * X * X * * *   00 ss0 011          1           1           6           00  BC
                                                                                                              01  DE
INC IX          IX <- IX+1          * * X * X * * *   11 011 101 (DDh)    2           2           10          10  IY
                                                      00 100 011 (23h)                                        11  SP

INC IY          IY <- IY+1          * * X * X * * *   11 111 101 (FDh)    2           2           10
                                                      00 100 011 (23h)

DEC ss          ss <- ss-1          * * X * X * * *   00 ss1 011          1           1           6

DEC IX          IX <- IX-1          * * X * X * * *   11 011 101 (DDh)    2           2           10
                                                      00 101 011 (2Bh)

DEC IY          IY <- IY-1          * * X * X * * *   11 111 101 (FDh)    2           2           10
                                                      00 101 011 (2Bh)