This game was not finished! Thayer's Quest includes only 3 kingdoms ('Weigard', 'Illes' and 'Iscar') of the 5 Kingdoms ('Far Reaches' and 'Shadoan' are missing). The game was simultaneously produced for the RDI Halcyon home system in 1984. The Halcyon's Thayer's Quest laser disc is double sided and it contains a great deal of material not found on the coin-op version disc.
Thayer's Quest was released only as a conversion kit for "Dragon's Lair
" and "Space Ace
". The kit replaced a lot of the original hardware, and included new side graphics (which consisted of a huge RDI logo, they didn't mention the game on the side, because they planned to release a whole line of games on the Thayer's Quest hardware, but those other games were never made). This game does not have a joystick at all. Instead it uses a keyboard for control (This was the first arcade game ever to have a qwerty keyboard). In an effort to save several dollars per unit, RDI decided to use a membrane style keyboard instead of a more sturdy switch based one. That was a really bad decision, the keyboards on these games do not last, they are easily damaged, and are not of high enough quality to use in an industrial coin-op product. Thayer's Quest also used a laser disc player, it could use either the Pioneer PR-7820, or the Pioneer LD-V1000.