Stack Light Rifle

Stack Light Rifle

The Stack Light Rifle is a light gun that was manufactured by Stack Computer Services and created for the ZX Spectrum, Commodore 64, and the Commodore VIC-20. It was released in 1983. The rifle is bundled with three games on tape, High Noon, Shooting Gallery and Grouse Shoot for the Spectrum. Different games were offered for the Commodore 64 and VIC-20 versions (all the games for these two systems were included on one cassette). It retailed for about $60, which is extraordinarily expensive given the fact that most cartridges were $10-20 each. The Stack Light Rifle is differentiated from future light guns as being very realistic looking; future unrealistic light guns such as the NES Zapper and the Sega Light Phaser dealt with controversy due to the guns still being misidentified as real firearms.

The main pistol is attached to 12 feet of cable which ends in a dead-ended ZX81-size connector which plugs into the Spectrum's user port. A barrel, stock and telescopic sight can all be attached to the pistol. The barrel actually facilitated the gun's performance as it filtered out ambient light. These three partscombined to provide a reasonable - if not perfect - degree of accuracy, and allowed the user to effectively use the light gun from the comfort of an armchair. One can extrapolate that the multi-part design was later mimicked on the Sega Menacer.

Variants of the Light Rifle were available for the ZX Spectrum, Commodore VIC-20 and Commodore 64 and all perform the same function. Like the Atari XG-1 light gun, the Stack Light Rifle was treated by the hardware as a light pen. Due to lack of availability of software drivers for the Light Rifle, only the three games that came with the device were available. In April 1985, Sinclair User magazine reported that Stack Computer Services company disappeared.

Stack Computer Solutions Limited now trades from Bootle Lancashire and can be found at www.stack.co.uk

Technical Specifications

The main component of the Stack Light Rifle System is the electronic target pistol that is connected to thecomputer by a generous length of lead. At the computer end, depending on the version, there is a connector forthe appropriate socket or edge connector. On the ZX Spectrum version the connector contains two chips and acouple of simple components to interface the main electronics inside the gun to the computer. To make the pistol more accurate and to turn it into a rifle - it is supplied with a shoulder stock that clips and secures to the rear of the pistol, a barrel and a make-believe telescopic sight.

The electronics inside the pistol consist of a light detector or photo-diode and a small amplifier and buffer. Lightcoming down the barrel is focused by a small plastic lens onto the photo-diode, and the device is sensitiveenough to detect the changes in intensity of the picture. Once boosted by the amplifier, the signal is clipped toprovide a digital pulse rather than an analogue waveform and is then fed to the computer via the switch. Thescreen position that is being scanned at that moment is the position the rifle is pointing at. As the computerreceives the pulse from the Light Rifle it compares the value of its scan registers with the screen position of thetarget and, if a match is found, the played has scored a direct hit.

upported Games

Commodore 64

*Escape From Alcatraz
*High Noon "Stack"
*Glorious 12th "Stack"
*Gallery "Stack"
*Crowshoot
*Rat's & Cats

Vic-20

*High Noon "Stack"
*Glorious 12th "Stack"
*Gallery "Stack"

External links

* [http://www.sincuser.f9.co.uk/037/news.htm Sinclair User Magazine: Issue 37, April 1985]
* [http://www.worldofspectrum.org/hardware/feat8.html World of Spectrum Feature on the Stack Light Rifle]
*WoS game|id=0012585|Stack Light Rifle Software


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