Re: My NES Zapper Lightgun interface for a PC

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: Hi, : Not in Mame yet. : What I have done, is I have use PaintShop pro to make a small white dot (big as a dime) with a black screen. : Then, I have used a S-video cable to connect my : PC output to a 27 inch color TV. : Basically the gun sense all the time light much : specifically, the gun have a high response on white target. : I have used an Oscilloscope to understand the gun and then to boost, filter an trig switch 4 of joystick A. To ensure that the Pc see this button, I have run a joystick test program that : show me that the switch is trigged only when the gun see a white target. : Note: because the TV have a refresh rate of 60hz, the gun trig the switch at 60 hz... : Now I have to make a base for the gun and use : two 100 KiloOhm pots (one to sense when the gun is moved left, right and another one to sense : when the gun is moved up and down). : And the big step is to modify Mame driver to recognize switch 4 of joystick A and to modify the emulated light gun to recognize a real one. : thanks : Reg : : Have you tried making a test program for this yet? : : : Hi, : : : Here is the prototype that I have used to interface : : : a NES Zapper Lightgun to my PC. : : : The goal of this electronic circuit is to boost : : : the signal of the gun (2 PNP transistor 2N3906), : : : filter the signal (CMOS 4093 ) and : : : trigger Switch 4 of the Joystick A port (CMOS 4066). : : : The gun trigger switch is connected to the Switch 1 of : : : Joystick A. : : : I have not tried to make a base to hold the gun. : : : Ideally the gun can be attached to a base and to : : : detect if the gun is moved from left to right or moved : : : up or down, you must use 100 kiloOhm pots. : : : Note: Mame simulate a video card that have a 60hz : : : refresh rate, so to increase the gun precision, : : : the monitor must also have a refresh rate of 60hz. : : : For those having a TV in their cabinet, the TV already : : : have a refresh rate of 60hz. : : : The next step is to make a base for the gun and to modify Mame : : : drivers to accept Joystick Switch 4 and to modify the emulated light : : : gun to accept the NES Zapper one. : : : I think that this circuit can be easily modified to interface most : : : lightgun to a PC. (usually a light gun need power , have a trigger and have an output). : : : Switch 4 is trigged when the gun see a white spot : : : (as small a a dime at four feet) on the TV / monitor. : : : Switch 1 is already implemented in Mame. : : : Here is the URL: : : : http://server36.hypermart.net/regisma/NES_Zapper_Lightgun_PC_Interface.GIF : : : Do not hesitate to contact me for more info... : : : thanks : : : Reg : : : regismalt@netscape.net

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