The SARGON II Commodore 64 version was written by Alex Ford in 1983. The SARGON II chess engine was written by the famous World Champion programmers Dan & Kathe Spracklen who also worked on many dedicated Chess Computers sold by Chaftiz Inc, and Fidelity Electronics.
The SARGON II software was repackaged and resold under several different names. It can also be found under the names CHESS CHAMPION, CHAMPIONSHIP CHESS and CHESS MASTER.
You can read about the original SARGON II here:
You must remember when using an Emulator that the position of the minus sign (-) on a Commodore 64/128 is the equal sign (=) on a PC. To enter your moves using an Emulator you must enter as follows: e2=e4 etc. ! Function Key F1 toggles between the Chess Board and the Move Information Menu. You can enter chess moves in both screens. Function Key F5 returns you to the Main Menu where you can start a NEW GAME.
The approximate rating for SARGON II is 1150 - 1250 ELO (1350 - 1450 USCF)