 However, the Spectrum's processor is not fast enough to write to an entire row of attribute bytes in one scanline, so 8×1 attributes can only be achieved over 20 columns.This technique is variously known as Hicolour, Multicolour, FLI or Rainbow Processor mode.A variation on this method is to change the complete row of attributes over the course of two scanlines, resulting in 8×2 pixel attribute blocks over the full width of the screen.