All ALG Games - Owners Manual (61 pages)
Mad Dog & Johnny Rock - Owners Manual (23 pages)
Dragon's Lair II to ALG Conversion - Owners Manual (20 pages)
Mad Dog McCree (Euro / Atari) - Owners Manual (26 pages)

U5 / U4
Crime Patrol 1.20 B R5 / R6
1.40 B R5 / R6
1.51 B R5 / R6
Crime Patrol 2 : Drug Wars 1.10 B R5 / R6
1.30 B R5 / R6
Fast Draw Showdown 1.30 B R5 / R6
1.31 B R5 / R6
Gallagher's Gallery 2.10 B R5 / R6
2.20 B R5 / R6
The Last Bounty Hunter 0.06 B R5 / R6
1.01 B R5 / R6
Mad Dog II : The Lost Gold 1.00 B R5 / R6
1.10 B R5 / R6
2.02 B R5 / R6
2.04 B R5 / R6
Mad Dog McCree 1c A R2 / R1
2.02 B R5 / R6
2.03 B R5 / R6
Space Pirates 1.4 B R2 / R4
2.2 B R5 / R6
Who Shot Johnny Rock ? 1.5 A R2 / R3
1.6 A R2 / R3
1.6 A R2 / R1
1.6 B R2 / R6

American Laser Games Virtual Library - Images and information of the major components



Compatible Laserdisc Players - Sony LDP-1450, LDP-1550, LDP-2000, LDP-3600D and compatibles

Sony LDP-1450 - Manual (19 pages)
Sony LDP-1450 - Service Manual (part 1) (50 pages)
Sony LDP-1450 - Service Manual (part 2) (19 pages)
Sony LDP-xxxx -
Command Set Info




MultiROM - The LaserCon ALG MultiROM is a direct replacement for the original RAM/ROM board used in American Laser Games arcade machines.  With this board, you can choose from Mad Dog McCree, Mad Dog 2, Who Shot Johnny Rock, Gallagher's Gallery, Space Pirates, Crime Patrol, Crime Patrol 2, and The Last Bounty Hunter.  Simply change the disc, turn a dial and you're playing a new game (laserdiscs not included)  For more information, check out the LaserCon ALG MultiROM page.

Different Versions - Three different versions of these games exist. The first two use laserdisc technology, the third is based on a 3DO home console. Early systems are one player only and use a plain Amiga 500 motherboard, a genlock, a Sony LDP-1450 laserdisc player, a Rev.A RAM / ROM board, a sound amplifier board, a single player optoisolator board, and a light gun. When two players games came in, a partial redesign of the existing hardware was done. The RAM / ROM board was upgraded to Rev.B, the optoisolator board was expanded to accept a second gun as input and the sound amplifier board was integrated into it. The two boards combined were named as TAOS board.  A one player game can be run on a two player setup by using the proper RAM / ROM board and utilizing the second player gun as the only gun for shooting.

Later versions were built around a Panasonic 3DO system, thus based on CD-ROM technology. The 3DO systems were slightly modified to be used in a arcade machine, utilizing custom interfaces (Coyote board) to connect the guns, coin mechs and control panel inputs to the game system. An example of modification that was done is the spindle motor replacement. Regular 3DO spindle motors were not designed to run all day in an arcade environment and used to fail soon, se Panasonic replaced them with heavy duty ones. The game CD-ROMs used in the arcades are different from the home versions, so they are not interchangeable. Gameplay is pretty much the same as the laserdisc versions, but the video quality is inferior.

All the games versions, both American and European, run on NTSC video format. The genlock and/or 3DO video outputs are NTSC composite, so the games can be played on a regular NTSC TV or monitor with composite video input. However, for arcade use, a standard NTSC demodulator board is used to display the NTSC video on the arcade monitors (25" and 33" versions). The big screen models use a regular 46" retro-projection Pioneer TVs mounted inside the cabinet.

Gun Info - For info on the gun wiring, check the ALG Gun Wiring Diagram. Most of the guns were black metal guns. Early models needed an external 'shot amplifier module' between gun and optoisolator board. This module was later removed with an hardware upgrade of the pcb mounted inside the gun itself.

Most of the weapons use a mercury switch installed inside their shell to detect the gun position (horizontal - shooting ; vertical - gun folded, reload position). Who Shot Johnny Rock uses a small machine gun, without mercury switch (the game doesn't support reloading). Space Pirates uses a sort of space laser guns. 3DO guns are orange plastic guns. Similar guns of the same color were sometimes used also in the laserdisc version of the games: the guns were lighter, with the same hardware as metal guns but mounted inside a gun shell marked 'Nintendo'.

Interchangeability - Most of the games are interchangeable with minor hardware adjustments with the exception of Fast Draw which uses a vertically mounted monitor while the other 8 games use a horizontally mounted monitor. To convert a game into another one, you basically have to change the RAM / ROM board and the laserdisc inside the laserdisc player. The game laserdiscs were all manufactured by 3M, one sided and plastic backed, with audio in English and in many other different languages, like Spanish, French, Italian, Chinese and Japanese.

RAM / ROM Board - There are two types of these boards: Rev. A, the early version, which uses two 27512 EPROMs (64 kB each) and Rev. B, which uses two 27C1001 or 27C010 EPROMs (128 kB each). In addition to the two EPROMs (U1, U2) which contain the game code, each RAM / ROM board is equipped with a zeropower RAM (U3 - MK48Z028-20 or equiv.) and two PAL chips (U4, U5 - PAL16L8). The idea of the PALs was to scramble the address lines and the PAL IC surfaces were scraped to prevent illegal reproduction of the boards. Other than that, the software on the EPROMs isn't encrypted at all, just scrambled in the addresses. "Mad Dog McCree" had its own scramble (Rev.A), "Who shot Johnny Rock ?" had its own (Rev.A), but the other games (Rev.B) were all the same. It was too much trouble to keep coming up with additional board versions. All of the games could run on the same RAM/ROM board, however, for production, they were run through different programs to scramble the bits. For more info in this, please visit the ALG RAM/ROM info page.

"Mad Dog McCree" and "Who Shot Johnny Rock?" were the very first games to be developed.  They were designed as a single player game only. The other games are two player games and required more ROM space because of the amount of software code, so a Rev.B of the RAM / ROM board with bigger size EPROMs was produced.

American Laser Games
Years released: 1990 - 1995

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