File list (Check if you may need any files):
Key-SIM\Last Loaded Key12-Sim.DBK
.......\Key12-Sim.DSN
.......\Key12-Sim.PWI
.......\...-Sim\STARTUP.A51
.......\.......\Key12.plg
.......\.......\key.C
.......\.......\STARTUP.LST
.......\.......\REG51.H
.......\.......\Key12_Uv2.Bak
.......\.......\Key12.lnp
.......\.......\Key12.M51
.......\.......\Key12.hex
.......\.......\Key12.Uv2
.......\.......\Key12_Opt.Bak
.......\.......\Key12.Opt
.......\.......\STARTUP.OBJ
.......\.......\key.LST
.......\.......\key.OBJ
.......\.......\Key12
.......\Key-Sim
Key-SIM