Changes

In the DDI-1, LK1 connects '''both''' to the Expansion Port /EXP pin(which goes to [[8255|PPI]] Port B, Bit5, '''and''' to the AMSDOS ROM bank number selection logic. The latter one allow to map AMSDOS to bank 7 (default), or bank 0. If AMSDOS sees itself mapped to bank 0, then it does automatically load & start the boot sector from drive A (equivalent as when typing |CPM after power-up).