HL register pair is 32 bit register .
LXI H ,0106 H -- Thsi instruction mean intialize HL register pair HL with 0106
SO H get 0000 0001 (01 )
L get 0000 0110 (06)
DCR L (06-->05) this mean decrement content of L register so 06 get decremented to 05
LOOP DCX ( DCX decrement the register pait by 1 here HL is a register pair which will be decremnet by 1 )
So HL=0105.
Continue above process until HL doesnt get intailize to 00
as soon it will be 00 it will violate NZ flag and reach to halt state
So the above loop will run for 105 times
NOTE (DCR=DECREMENT THE CONTENT OF REGISTER BY 1 , WHILE DCX DECREMENT THE CONTENTS OF REGISTER PAIR BY 1) :)