> Can you explain me these three lines of code (z80 assembly)?

Can you explain me these three lines of code (z80 assembly)?

Posted at: 2014-12-18 
0000 f3 di

0001 2100c0 ld hl,0c000h

0004 7e ld a,(hl)

0000 f3 di

0001 2100c0 ld hl,0c000h

0004 7e ld a,(hl)