LoadEDTile

LoadEDTile: ; 675b (1:675b)
; In Red/Blue, the bank for the ED_tile was defined incorrectly as bank0
; Luckily, the MBC3 treats loading $0 into $2000-$2fff range as loading bank1 into $4000-$7fff range
; Because Yellow uses the MBC5, loading $0 into $2000 - $2fff range will load bank0 instead of bank1 and thus incorrectly load the tile
; Instead of defining the correct bank, GameFreak decided to simply copy the ED_Tile in the function during HBlank
    ld de, ED_Tile
    ld hl, vFont + $700
    ld c, $4 ; number of copies needed
.waitForHBlankLoop
    ld a, [rSTAT]
    and %10 ; in HBlank?
    jr nz, .waitForHBlankLoop
    ld a, [de]
    ld [hli], a
    ld [hli], a
    inc de
    ld a, [de]
    ld [hli], a
    ld [hli], a
    inc de
    dec c
    jr nz, .waitForHBlankLoop
    ret