$DF01/57089/REU+1: Command Register +----------+---------------------------------------------------+ | Bit 7 | Execute: 1 = Transfer current Configuration | | Bit 6 | Reserved (normally 0) | | Bit 5 | Load: 1 = enable autoload option | | Bit 4 | FF00: 1 = start immediately | | | 0 = wait for write access to $FF00 | | Bits 3-2 | Reserved (normally 0) | | Bits 1-0 | Transfer Type: 00 = transfer C64 -> REU | | | 01 = transfer REU -> C64 | | | 10 = swap C64 <-> REU | | | 11 = compare C64 - REU | +----------+---------------------------------------------------+