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| Minwah:
--- Quote from: JoeB on September 15, 2005, 11:43:58 am ---- the JPAC video output is composite, which is what the gun needs, so no need to build any circuit. It's a direct tap! --- End quote --- Doesn't joining the h & v syncs from the AVGA make a suitable composite sync? I know it is sufficient for Scart TV's which require a composite sync... |
| Alcohol:
--- Quote ---What pins on the Scart? Just Gnd & Sync? --- End quote --- pins 20 and 17 --- Quote ---OK, I didn't think the PS2 connector was usually required...probably varies on gun type (?) --- End quote --- some guns need 9v through a pin on the psx connector, iused my adapter because it had a 9v input on it, thats all --- Quote ---Cool, I suppose as the AVGA can be connected straight to a TV it already has the correct sync (?) --- End quote --- i used the old mamescart diagrams to make my original cable and it worked first time, but to try and improve accuracy i made a new cable using these diagrams http://www.idiots.org.uk/vga_rgb_scart/index.html using that cable gave me a messed up picture at first so iam "guessing" the arcade vga does not give out composite sync, so i joined h and v-sync together on the vga connector and connected pin 20 and 16 together on the scart connector.. this fixed the picture and the cable did give a good improvement on accuracy compared to the old mamescart diagram i made my first cable from.... --- Quote ---With new (beta) versions of Mamewah you could try game-specific commandline settings, so you can use {safelaunch} and {dosbox} which *may* solve the problem. --- End quote --- its a little wierd but ill keep working on it.. mame/lightgun and mamewah works great, but when i launch hotd2 from mamewha as soon as i press a button on the gun it locks up Alc.. --- Quote --- --- End quote --- |
| Silver:
--- Quote from: Minwah on September 15, 2005, 11:55:41 am ---Doesn't joining the h & v syncs from the AVGA make a suitable composite sync? I know it is sufficient for Scart TV's which require a composite sync... --- End quote --- In theory no, in practice - probably. It actually depends on the kit. A lot of people have success creating a composite sync by joining the wires - the results are not perfect, but a lot of kit can deal with it. Note (to anyone else): that this only works with the ArcadeVGA because its already outputing a 15Khz signal. You can not do the above with a regular VGA card (or at least you can, but it would be useless as its a 31Khz+ signal) Next Note: All modern radeon drivers I have seen (I've never seen ArcadeVGA drivers, so they may not) can be set to ouput composite sync in the display options. Almost all radeons can be made to ouput 15Khz signals via powerstrip. Add the two together and in theory the radeons can output a composite 15Khz signal directly, with no circuits whatsoever. I plan to test if this works sometime but it may well not....? |
| Alcohol:
--- Quote from: Silver on September 16, 2005, 05:45:07 am --- A lot of people have success creating a composite sync by joining the wires - the results are not perfect, --- End quote --- This was something i was thinking about, ive joined the wires on mine and it works well, bu t i was thinking of buying a j-pac to get composite sync and tapping off the edge connector to my scart connector. what iam getting at is, would the composite signal from a j-pac give me better results than h-sync and v-sync connected together?, or is composite sync the same all the time and cant be improved or done poorly? Alc.. |
| Silver:
I honestly don't really know. However, I suspect if the gun seems to work - then its picking up the syncs and changing to a system with cleaner syncs is not really going to improve things. Syncs are basically just a 'pulse' of voltage at regular intervals. Monitors and such have 'clamping' circuits that rebuild a clock frequencey based on the timing of these pulses - essentially allowing it to work out where and when to place each bit of the picture. Theres no grey area - it either works (your picture is stable) or not (your picture rolls). This is simplified, but basically if it works then it thres not much to improve... |
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