trog Trog (rev LA5 03/29/91)

Immagine gioco: Trog (rev LA5 03/29/91)
Available images:

Romset name:
Production year: 1990
Manufacturer: Midway

Game genre: Maze
Category: Maze

This machine has the following clones:
 • Trog (prototype, rev 4.00 07/27/90)
 • Trog (prototype, rev PA6-PAC 09/09/90)
 • Trog (rev LA3 02/14/91)
 • Trog (rev LA4 03/11/91)

This machine works in MAME This machine works in MAME

Overall emulation: Good
Color emulation: Good
Sound emulation: Good
Graphics emulation: Good
Save states: Supported

In MAME since version: .120u3

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

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

    TMS34010 ("maincpu")cpu 40000000 Hz
    M6809E ("cvsd:cpu")cpu 8000000 Hz
    Speaker ("speaker")audio
    Williams CVSD Sound Board ("cvsd")audio
    YM2151 ("cvsd:ym2151")audio 3579545 Hz
    8-Bit R-2R DAC ("cvsd:dac")audio
    HC-55516 ("cvsd:cvsd")audio

  • Screens [Show details]

    This machine uses a single screen:
      Graphic type: Raster
      Screen orientation: Horizontal
      Resolution 410 x 256 @ 54.706840 Hz

  • Number of players: 4P Simultaneous
  • Controllers [Show details]

      Joystick [8 ways]
      Joystick [8 ways]
      Joystick [8 ways]
      Joystick [8 ways]
    Number of buttons: 1

  • Dip-switches [Show details]

    Default settings in bold
     Free Play
    Coinage SourceDipswitch
    Test SwitchOff
    Video FreezeOff
    Players4 Players
     3 Players
     2 Players
     1 Player
    Coin CountersOne Counter
     Two Counters
    Powerup TestOff
    Service ModeOff

  • ROMs (15 of the machine set) [Show details]

    Referred to MAME version: 0.181

    NameSizeCRC32SHA1StatusIn romset
    trog_ii_u-4_sl_1.u465536759d0bf4 c4c3fa51c43cf7fd241ac1f33d7d220aa9f9edb3 good trog
    trog_ii_u-19_sl_1.u1965536960c333d da8ce8dfffffe7a2d60b3f75cc5aa88e5e2be659 good trog
    trog_ii_u-20_sl_1.u206553667f1658a c85dc920ff4b292afa9f6681f31918a200799cc9 good trog
    trog_ii_u-105_la-5.u105131072d62cc51a a63ed5b0e08dd89a1392e04cd88c9d83d75810c6 good trog
    trog_ii_u-89_la-5.u89131072edde0bc8 95389b75c438c0f0cad668a35570fcb4f7790a02 good trog
    trog_ii_u-111_la-1.u1111310729ded08c1 bbf069f218e3f3d67e45fa2229a471451b3a8f96 good trog
    trog_ii_u-112_la-1.u11213107242293843 cae77eeddd784573beccb79e54573da0e4ccdd8a good trog
    trog_ii_u-113_la-1.u11313107277f50cbb 5f2df3aedd90871ac02bca07c66387f6cda0dfdf good trog
    trog_ii_u-106_la-1.u106131072af2eb0d8 3767e6f3853b092b40664c2b6c6a838f0243514b good trog
    trog_ii_u-107_la-1.u10713107288a7b3f6 ba55f66929841a915d7b96aabf4b11e50ba6cfbd good trog
    trog_ii_u-95_la-1.u95131072f3ba2838 2bee6c783c84a9f3f9309d802f42983857190ece good trog
    trog_ii_u-96_la-1.u96131072cfed2e77 7fc0f52ac844c9efcbcc3004c40f9f4fc7e1c346 good trog
    trog_ii_u-97_la-1.u971310723262d1f8 754e3e8223edd11398b2db77fd5db619dad1577b good trog
    trog_ii_u-90_la-1.u9013107216e06753 62ec2b18e6b965ea0792d655d7878b4225da3aca good trog
    trog_ii_u-91_la-1.u91131072880a02c7 ab1b2d24be4571a183b230d267c6c8167d4a42a4 good trog

    :  PARENT Machine
    :  CLONE Machine
    :  BIOS
    :  Device


Trog (c) 1991 Midway.

1 to 4 players take on the role of a cute dinosaur, selected from the four on offer : Rex (red), Bloop (blue), Spike (yellow) and Gwen (lavender). The game takes place in a prehistoric land called 'Og' and is made up of forty-nine different islands; the dinos must collect all of the dinosaur eggs that lay on the islands, while avoiding the unwanted attention of a tribe of one-eyed cavemen, called 'Trogs'. The dinos can punch the attacking Trogs; one punch will only stun a Trog but several punches will knock the enemy off the screen. There are 4 different Trogs who pursue the dinos :

* Brown Trogs who use only their fists.

* Red Trogs who use clubs and create fires or holes in the ground.

* Blue Trogs who pop up out of the ground and roll stone wheels.

* Green Trogs who bounce around trying to crush you with their springs.

On each island, after the dinos have gathered up all of their eggs, they must make their way to the base labeled 'Home'; from here they will move on to the next island.

Between each stage, there is an intermission where the players' Dinos will dance, with an on-screen caption proudly declaring 'Excellent!', 'Congratulations!', 'Nice Work!', 'Good Job!' or 'Dino-Mite!'. On occasion, an intermission screen appears that shows a Trog planning another attempt to eat a Dino.


Midway Y Unit hardware

Main CPU : TMS34010 (@ 6.25 Mhz)

Sound CPU : M6809 (@ 2 Mhz)

Sound Chips : YM2151 (@ 3.57958 Mhz), DAC, HC55516 (@ 3.57958 Mhz)

Players : 4

Control : 8-way joystick

Buttons : 1


Released in February 1991. The word Trog comes from 'Troglodyte', a term that refers to a prehistoric cave-dweller or caveman.

About the PROTOTYPE REV 4.00: This particular code revision is also referred to in other resources as 'BattleTrog'. This prototype (known in Midway as Trog Proto 4) represents the original concept for the game Trog. The plans called for a strategy game where the player character, a dinosaur, had to be manipulated via placing bones to block his or her path, similar to many home computer games of the time. However, it soon became clear on field tests that players were confused and frustrated by this method of control in an arcade setting, where such strategic thinking was rarely required. Some surveys suggested that many players expected the game to be a simple "Pac-Man"-style affair. Many customers also were concerned/laughed openly at the action buttons labelled 'Bone', the term also being used in American slang for certain 'mature' acts and at least one cabinet panel was defaced to add an 'R' to the end of the word. As a consequence of this disastrous location test, the game was nearly axed entirely. Indeed, it probably would have been had it not been for the stop motion animation created for use as sprites in game - the story is that its high cost resulted in many of the senior employees at Midway demanding that Trog remain a going concern, with a new game mechanic built around the sprites. As it turned out, the game was turned into a "Ms. Pac-Man" clone, the small and large pills replaced with eggs and pineapples. It has been argued by some, including myself, that the use of trackballs instead of joysticks would salvage the original game mechanic, but closer inspection of the hardware through the MAME emulation suggests that 4-player trackball play, or indeed any trackball play could not be included without major complications, or indeed a whole new Midway hardware unit being devised.

About the REV PA6-PAC: This prototype (known in Midway as Trog II Proto 6) represents the first major step towards the final Trog concept. The deviation from the standard naming system (the game would normally be listed as Trog PA6 only) represents the change in the project, the -PAc extension added to make it perfectly clear that this was a "Pac-Man" clone. With the original plans for a strategy game abandoned due to a poor location test, new thinking was required to salvage the project - it is rumoured that too much had been invested in the animation for the project to be canned at this stage. Money became very tight on the Trog II project (Trog I being the abandoned strategy game) and so a total rewrite of the concept was out of the question - they would have to make do with the existing code libraries for the project, with only minor alterations. Pushed for time and funding, the programmers decided to make the game into the Pac-Man clone many expected it to be, as this would require the least recoding, all that would be required would be to make the dinosaurs fully controllable, instead of the guided automatons they were originally. However, it was clear that the Trog AI would make them too good for even the best of players to overcome through clever moves, so a 'Punch' option was added which replaced the 'Bone' function and led to the only new animation added in the project, - a 3 frame jab which looked poor compared to that of the Trogs due to the time pressures on Haeger at the time of animation. With this established, the programmers then altered the level order to provide a more suitable learning curve for the game, however this destroyed the main purpose of the 'Trog's Cave' intermissions screens and meant that the order of Trog's thoughts didn't fully match his actions. Also, although some of the 'thought balloon' animations (created on the fly through the game ROMS) were changed to remove the bone breaking scenes relating to proto 4, the cave drawings (done by professional 2-D animators) could not be altered due to time and money considerations. The original ending of the game was also scrapped, as it was believed to be an anticlimax, so another hastily animated island was added for an extra challenge, purported to be Trog's Cave (Note the use of the intermission style lettering coupled with superimposed text straight from the ROM, again new graphics were out of the question). However, most of the other features remained intact, with a Complex Egg Lay option being added in the release versions to allow owners to change the egg patterns back from the Pac-Man style to the original layouts (it is believed that there may be a version of the game which put the original mechanic back in too, but no evidence of this has been found).

Trog makes appearances in latter Midway titles. As a shootable easter egg in the game "Revolution X". Additionally, the arcade cabinet makes a brief appearance in the 1991 movie "Terminator 2 - Judgment Day"; two girls attend the machine inside a shopping mall arcade as the T-1000 questions them regarding the whereabouts of John Connor. In the horror rail shooter arcade game "CarnEvil", Trog can be found in the Freak Show portion of the game as an attraction in the background. He is frozen in a block of ice and labeled 'Frozen In Time!'. The dino characters also appear as enemies in the Rickety Town level of the game.


* PROTOTYPE REV 4.00 (July 27, 1990):

- The bonus groove is still part of the released game's sound test, despite the fact it is now exclusively used for Trog's Cave and the ending - the prototype's bonus sequence was longer, as time and skill points were added, thus it needed music.

- The dinosaurs punch is poorly animated - this feature was added for the new game to allow fending off of the Trogs and as a result was just a few extra frames of animation made at the 11th hour by Jack E. Haeger.

- The last level uses the Intermission 'Trog's Cave' text, complete with graphical artefacts that were cut off on its normal background, due to the need to minimize adding graphics to the already overtime and over-budget project (the rest of the explanatory text is placed on screen using the same code that superimposes the victory messages).

- The Trog's Cave sequences no longer match up with the introduction of each new enemy - due to the restructure of the levels.

- Trog is seen trying to overcome bones in the recap drawings. In reality this scene was shot for the prototype, when the player's bones could be smashed or jumped on and not replaced due to the cost of redrawing the animation (it is worth pointing out that the main scenes have bone bashing elements removed).

* REV PA6-PAC (September, 09, 1990)

* REV LA3 (February 14, 1991)

* REV LA4 (March 11, 1991)

* REV LA5 (March 29, 1991)


While playing the game, try not to fall off the island. You must avoid or fight off any stone wheels that roll toward you and also avoid any tar pits that will occasionally appear. The Trogs are clumsy and dumb and will sometimes fall off the island, sink into the tar pits or blunder into their own traps. However, an island may have holes with warp grids that will advance your Dino two or three islands ahead if your Dino falls into it. These form when you take the shiny egg (in the lower-right corner, there will be one egg that will shine) last. In addition, all players will receive a cool 300,000 point bonus.

On some islands, there will be doors that will lead from one area to another and some will have springboards that will transport your Dino from one side of the island to another. The springboards will hurl the green Trogs to their deaths.

On each island, there are a number of special power-items to collect :

* 'Red roots' that give your Dino extra speed

* 'Yellow horseshoes' that will temporarily form a protective forcefield around your Dino

* 'Fiery chilli peppers' that make your Dino to spit fireballs to burn the Trogs

* 'Ice jewels' that will momentarily freeze all the Trogs on the island

* 'Pineapples' that will temporarily turn your Dino into an unstoppable, Trog-eating tyrannosaurus rex.

Avoid the grey mushrooms as they will slow your Dino down.

Some islands have timed bonus stages that will give you a chance to earn bonus points. These stages include :

* Trog Feasts where your Dino will be a tyrannosaurus rex and will attempt to eat as many Trogs as possible before time runs out

* Trog Barbecues where your Dino will spit fireballs and try to burn as many Trogs as possible before time runs out

* Diamond Mines where your Dino will attempt to capture as many gems as possible (including diamonds, rubies and emeralds) before time runs out.

When stage is starting, take a look carefully at eggs, 1 egg will shine (little star) for 1 or 2 seconds. Get this egg as last egg on stage -> a teleport will open. You can enter to teleport instead normal exit, you will skip some stages.


Artwork and playmation : Jack E. Haeger (JEH)

Game designers : Jack E. Haeger (JEH), George N. Petro (GNP)

Music and sounds : Chris Granner

Software : George N. Petro (GNP) & Kurt Mahan

Hardware : Mark Loffredo (M L), Glenn Shipp (GWS), Cary Mednick, Al Lasko (AL ), Raymond Gay, Sheridan Oursler

Cabinet designer : Ray Czajka (RAY)

Cabinet artworks : Linda Deal (LTD), Jack E. Haeger (JEH)

Publication : Karen Trybula

Marketing : Laura Rezek (LJR)


* Consoles :

Nintendo Famicom


Game's rom.

Machine's picture.

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Chiudi Lista

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 trog

0.120u3 [icronnya77]

0.34b7 [Alex Pasadyn, Zsolt Vasvari, Kurt Mahan]


- 0.145u7: Added 'Williams CVSD Sound Board' sound.

- 0.138u4: Changed description of clone 'Trog (rev PA6-PAC 09/09/90)' to 'Trog (prototype, rev PA6-PAC 09/09/90)'. Renamed (trogp) to (trogpa4).

- 0.122u6: Changed TMS34010 CPU1 clock speed to 40MHz and M6809E CPU2 to 8MHz.

- 0.122u4: Replaced M6809 CPU2 with M6809E. Changed YM2151 clock speed to 3579545 Hz.

- 0.120u3: icronnya77 added Trog (rev LA5 03/29/91). Changed parent description to 'Trog (rev LA5 03/29/91)'. Renamed (trog) to (trog4).

- 0.114u1: Changed TMS34010 CPU clock speed to 5MHz, visible area to 399x253 and VSync to 27.407585 Hz.

- 0.101u1: Removed 2nd sound channel.

- 0.63: Added clone Trog (rev PA6-PAC 09/09/90). Changed visible area to 396x256.

- 26th December 2002: David Haywood added another revision of Trog to the Williams/Midway Y/Z-unit driver.

- 24th December 2002: Guru - Trogg II (Williams/Midway 1990) arrived from Taucher.

- 0.37b5: Changed visible area to 400x255 palettesize from 65536 to 256 colors.

- 22nd February 2000: Aaron Giles fixed a memory bug affecting Trog.

- 0.36b16: Added Custom sound and changed VSync to 53.204948 Hz.

- 28th January 2000: Zsolt Vasvari fixed speeds in some TMS34010 games and highscores now display in Trog.

- 0.36b7: Rewritten the HC55516 CVSD decoder [Aaron Giles]. This affects Sinistar, Joust 2, Arch Rivals, Pigskin, Tri-Sports, Smash TV, Trog and Narc.

- 0.35b2: Replaced the 3x DAC sound with HC55516 and 1x DAC.

- 0.34b8: Zsolt Vasvari added Trog (rev LA3 02/14/91). Changed parent description to 'Trog (rev LA4 03/11/91)' and clone '(original prototype)' to '(prototype, rev 4.00 07/27/90)'.

- 0.34b7: Alex Pasadyn, Zsolt Vasvari and Kurt Mahan added Trog (Midway 1990) and clone Trog (original prototype).

- 10th September 1998: Dumped Trog (rev LA4 03/11/91).


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