thayersa Thayer's Quest (set 2)

Immagine gioco: Thayer's Quest (set 2)
Available images:

Romset name:
Production year: 1984
Manufacturer: RDI Video Systems

Game genre: Platform
Category: Platform / Run Jump

This machine is a clone of:
 • Thayer's Quest (set 1)

This machine is NOT working in MAME This machine works in MAME

Overall emulation: Preliminary
Color emulation: Good
Sound emulation: Preliminary
Graphics emulation: Good
Save states: Not supported

In MAME since version: .118u3

The MAME driver of this machine is: thayers.cpp - Read the code

 Tech info 
 Hardware of this machine:
  • CHIPs [Show details]

    Z80 ("maincpu")cpu 4000000 Hz
    COP421 ("mcu")cpu 2000000 Hz
    Pioneer PR-7820 ("laserdisc")audio
    Speaker ("lspeaker")audio
    Speaker ("rspeaker")audio

  • Screens [Show details]

    This machine uses a single screen:
      Graphic type: Raster
      Screen orientation: Horizontal
      Resolution 704 x 480 @ 59.940057 Hz

  • Number of players: ???
  • Dip-switches [Show details]

    Default settings in bold
    Time Per Coin110 Seconds
     95 Seconds
     80 Seconds
     70 Seconds
     60 Seconds
     45 Seconds
     30 Seconds
     Free Play
    Coinage2 Coins/1 Credit
     1 Coin/1 Credit
    Demo SoundsOff
    Attract Mode AudioAlways Playing
     One Out of 8 Times
    Service ModeOff
    LD PlayerLDV-1000

  • ROMs (2 of the parent set, 1 of the clone set) [Show details]

    Referred to MAME version: 0.181

    NameSizeCRC32SHA1StatusIn romset
    tq_u33.bin3276882df5d89 58dfd62bf8c5a55d1eba397d2c284e99a4685a3f good thayers
    tq_u1.bin819233817e25 f9750da863dd57fe2f5b6e8fce9c6695dc5c9adc good thayersa
    tq_cop.bin10246748e6b3 5d7d1ecb57c1501ef6a2d9691eecc9970586606b good thayers

    :  PARENT Machine
    :  CLONE Machine
    :  BIOS
    :  Device

  • CHDs [Show details]

    Support information
    Size: 0 bytes/0 Mb
    CHD Information
    Size: 0 bytes/0 Mb
    CHD MD5:
    CHD SHA1:


Thayer's Quest (c) 1984 RDI Video Systems.

This is a fantasy title, and has unbelievable graphics (hand drawn animations pulled from a laserdisc). You guide young Thayer on a quest through the three kingdoms. You are supposed to defeat Sorsabal The Twisted at the end of the game. This game is far different from most laserdisc games. It is not a 'tweak' game, it works more like a 'Choose Your Own Adventure Story'. It doesn't always tell you all your available options, but you do not have to memorize complex, precisely timed movements like you do in "Dragon's Lair". Once you know what to do in a given Thayer's Quest scene then you will be able to do it every time. To make up for this ease of memorization the programmers decided to make the game automatically deduct a life every so often, to keep the player from being able to play forever on a single quarter (which was a big problem with "Dragon's Lair").


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.


* Humor : When prompted to type in your name, do nothing. After intervals of one minute or so, the game speaks out saying things like 'Do not be shy, enter your name', 'Have you gone to the toilet?', 'Do not be a stranger now, enter your name', 'Look lively now' and a whole host of other funny comments.


1. Thayer's Quest (1984)

2. Kingdom - The Far Reaches (Sega 32X CD [Unreleased Prototype])


* Consoles :

RDI Halcyon System (1984)

Sega CD [Unreleased Prototype]

Philips CD-I (1995, "Kingdom")

Panasonic 3DO

* Computers :

PC - 1995


Game's rom.

Machine's picture.

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Warning: information in history.dat can differ from the ones present in the rest of the page (taken from MAME) as they come from a different source

Information on thayers

0.118u2 [Andrew Gardner]

Artwork available


* Dump Laserdisc


- 0.149u1: Modernized COP400 cpu core [Wilbert Pol].

- 0.144u6: Replaced 'Laserdisc Analog' sound with 'Pioneer PR-7820'.

- 0.143u4: Changed VSync to 59.940057 Hz.

- 0.141u4: Changed description to 'Thayer's Quest (set 1)' and clone to 'Thayer's Quest (set 2)'.

- 0.129u4: Changed Custom sound to Laserdisc Analog.

- 0.127u3: Added Custom sound.

- 0.127: Aaron Giles added DISK_REGIONS to all laserdisc drivers. Changed visible area to 704x480 and VSync to 59.940052.

- 0.125u5: Thayer's Quest changes [Curt Coder]: Cleaned up driver. Added LED layout from Dragon's Lair. Mapped keyboard and dips correctly. Added laser disc drive selection. Fixed Z80-COP communications. Figured out ports from disassembly. Added cart presence detection logic. Fixed SSI-263 timings, service mode works now. Changed to use COP421 (2MHz). Added dipswitches 'Service Mode' and 'Unused'.

- 0.125u4: COP4xx updates [Curt Coder]: Added HALT opcode and halt mode to the COP410. Added Microbus support, clock divisor selection and CKO mode selection to the COP420. Changed Thayer's Quest keyboard interface to at least slightly resemble the schematics. Aaron Giles fixed fatal Error crash in Thayer's Quest.

- 0.120u3: Atari Ace added static qualifiers and renamed symbols in MAME in an effort to further tidy up the global namespace. Generally generic names were targeted and some symbols that were both static and extern. Some specifics: Dead code in thayers driver was discovered and commented out.

- 30th September 2007: Mr. Do - A few months ago, Jcroach finished up the vector job for a Dragon's Lair scoreboard. I wasn't in too big of a hurry to release it, as the games still aren't working yet; plus I didn't have a speaker cover for it yet. Well, I finally got the speaker cover, so here it is. The games still aren't working, but at least you'll have the artwork when it's ready. The scoreboard is used in Dragon's Lair, Thayer's Quest, and for cabinets that were converted to Space Ace. (Still looking for a dedicated Space Ace scoreboard, btw. Let me know if you find one. You can see one here). Also included in Thayer's Quest is a scan of the keyboard, so you know what you're doing. And thanks to Ad_Enuff for that nice little graphic to finish off the speakers.

- 0.118u3: Andrew Gardner added clone Thayer's Quest (Alternate Set). Andrew Gardner added counter emulation to the COP420 CPU core. Hooked it up to Thayer's Quest and added an alternate set.

- 0.118u2: Andrew Gardner added Thayer's Quest (RDI Video Systems 1983).

- 12th July 2004: 3D ARCADE - New 3D cabinet model for Thayer's Quest from Pariah.

Other Emulators:


Romset: 41 kb / 3 files / 22.4 zip

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