func (n *MMC1) Patterntable(i int) *ppu.Patterntable { return ppu.NewPatterntable(make([]byte, 0x1000)) }
func (n *NROM) Patterntable(i int) *ppu.Patterntable { return ppu.NewPatterntable(n.Rom.ChrBanks[i]) }