INI - Z80 instruction reference

iniInput and increment 
Reads a byte from the port addressed by BC into (HL), then increments HL and decrements B.
2 bytes · 16 cycles
SZHP/VNC ?●??1?
● set from the result
1 always 1
? undefined afterwards
Forms  ini  
A byte from the port at the 16-bit address contained in the BC register pair is written to the memory location pointed to by HL. Then HL is incremented and B is decremented. Note that the carry flag may be affected, contrary to documentation. Read More
         .org 0x8000
        ld hl, 0x9000
        ld b, 2
        ld c, 0xF0
        ini
        halt