Amstrad LP-1 light pen

The LP-1 Lightpen by Amstrad

The LP-1 is the official Amstrad lightpen (with software from Amsoft, and hardware from Trojan).

Connects to the Joystick port (not to the Lightpen input on the Expansion Port).

The pin-outs are unknown?

• One pin is probably used as Light Sensor, but which?
• Other pins might be used as power supply (needing to drag some pins HIGH and others LOW by software) (or does it contain a battery)?

Software seems to indicate it has a battery..?

• There seems to be no additional button (like on Light-guns)?
• According to the advert and package, the light pen works with color monitor only ("pour moniteur couleur uniquement"), ie. not with green screens.

• Amstrad LP-1 (Amstrad/Trojan)
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  Advert

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  Package

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  Connector/Schematic

• Trojan Cad-Master (Trojan)
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  Front

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  Back

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  Open

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  Pen

Media:LIGHTPEN.ZIP - Software taken from John King's website.

• Amstrad LP-1 Light Pen Manual (jpg's) (French)
• Amstrad LP-1 Light Pen Manual (pdf) (French)