INS  Increment Register Pair Instruction

Contents of the registers pair R_P will be  incremented by one  and the  result  will be stored  in the  same  register pair. It is  also an  exceptional  case in  accumulator is not used as one of the  operand. The instruction  format is

INS R_P                               (R_P - R_P + 1)

Flags : No  flags  are modified.

INX B  means increment  register pair BC.

INX D  means increment  register pair DE.

INX H means  increments registers pair HL.