[[Image:Amstrad light pen.jpg|right|thumb|250px|The LP-1 Lightpen by Amstrad]]
A Lightpen by The '''LP-1''' is the official [[Amstrad]] lightpen (with software from [[Amsoft]], and hardware from [[Trojan]])... The '''CAD-MASTER''' seems to be the same hardware (but marketed directly by [[Trojan]], and with different Software included).
== Technical ==
Connects to the Joystick port (not to the Lightpen input on the Expansion Port).
Input:
Light Sensor --> Keyboard.Row9.Bit1 (aka Joystick Down) (0=Light, 1=No Light)
Output:
Keyboard.Row9 is constantly held LOW during lightpen access
Keyboard.Row6 is constantly held floating during lightpen access (isn't HIGH because it's open collector)
Keyboard.Colums aka PSG.Ext.PortA are configured as inputs aka HIGH-Z
The above LOW and HIGH-Z levels seem to be misused as power supply GND and 5V. There seems to be no power-supply required for the CPC version (unlike the ZX Spectrum version, which connects to cassette EAR port, and which requires an external 9V battery).
'''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)?* There seems to be no additional button (like As seen on Light-guns)?* According to the package and advert and package, both the LP-1 and CAD-MASTER light pen works pens work with '''color colour monitor only''' ("pour moniteur couleur uniquement"), ie. not with green screens.
== Pictures ==
<gallery caption="Amstrad LP-1(Amstrad/Trojan)">
File:Amstrad Crayon Optique LP-1 Advert.jpg|Advert
File:Amstrad Crayon Optique LP-1 Package.jpg|Package
File:NoPictureAmstrad LP-1.gifjpg|ConnectorAmstrad Light Pen LP-1 Package - EnglishFile:Amstrad light pen.jpg|Pen</Schematicgallery> <gallery caption="Trojan Cad-Master (Trojan)">File:Trojan-cad-master-light-pen-front.jpeg|FrontFile:Trojan-cad-master-light-pen-back.jpeg|BackFile:Trojan-cad-master-light-pen-open.jpeg|OpenFile:Trojan-cad-master-light-pen-pen.jpeg|Pen
</gallery>
== Software / Downloads ==
* None such [[Media:LIGHTPEN.ZIP|Amstrad LP-1 drivers]] - (English) (bas/bin) - [http://www.cpcwiki. eu/index.php/User:Jonathanen Jonathanen]* [[Media:LP-1.zip|Amstrad LP-1 drivers]] - (English) (DSK for Emulators) - [http://www.cpcwiki.eu/index.php/User:Jonathanen Jonathanen]* [[Media:Amstrad Crayon Optique Trojan LP-1 Tape.zip|Amstrad LP-1 drivers]] - (French) (cdt)* [[Trojan CAD-MASTER drivers.zip]] - none such? The LP-1 package consists of MCPEN.BIN (machine code driver), and LIGHTPEN.BAS (instructions, demonstration, and NIM game).
== Manual ==
* [[Amstrad LP-1 Light Pen Manual]](jpg's) (French)* [[Media:Lightpen LP-1.pdf|Amstrad LP-1 Light Pen Manual]] (pdf) (French)* [[Trojan CAD-MASTER Manual]] - none such?
[[Category:HardwareInput Device]] [[Category:Peripherals]][[Category:Amstrad Products]]