Old chess programs online

1.Browser javascript based, it works, and   +buttons for tablets and mobiles.

jsDosBox based

BattleChess

CM2000, CM2100

Siberian

Fritz2 NOW , ychess, Genius 3, Sargon, Zarkov, Rival, PowerChess, BlueBush

...

Commodore 64 chess:

Puzzles, Colossus4, Sargon2, Sargon3, Cyrus II, MasterChess, Petchess, Cesar,
Chess75, SuperChess, FalkenSchach, BattleChess, GrandMaster, MyChess

also js VICE emulated Sargon2 , Colossus4,

ZX Spectrum chess:
keyboard only Psion, Psion3D, The Turk, Colossus4 (bugs)

MSX chess, or (2)

Chess for NES.


Thanks to authors and all developers!