Here are some cheats and tips for the game Excalibur 2555 AD.
During the game press ESC & F12 simultaneously with the following:
Two times Up Arrow, Two times Left Arrow, Two times Right Arrow & Two
times Left Arrow = FULL SWORD POWER.
One time Up Arrow & Seven times Left Arrow = FULL HEALTH
Now let go the Esc & F12 (continue is selected) and press space bar.
There must be a cheat for skipping levels also, but that one is hard
to find.