Kirby's Adventure, which is Mapper #4 or MMC3, starts off like this:

sei
lda #$00
sta $8000
jmp $c000

$C000:
lda #$08
sta $2000
lda #$18
sta $2001
lda #$00
sta $4010
lda #$40
sta $4017 ; ??? WTF ???
sta $e000
lda $2002
lda #$10
sta $67

label1: ;??? WTF ???
tax ;??? WTF ???
sta $2006
sta $2006
eor #$10
dex
bne label1 ;??? WTF ???

Can anyone explain this bizarre code? Thanks. ^_^