Main > Main Forum
J-Pac / I-Pac
pcates:
--- Quote from: krick on January 10, 2005, 06:52:37 pm ---The J-PAC also has a video circuit that divides a 31KHz VGA signal so that it cannot damage your arcade monitor if you accidentally send it a VGA signal.
Since my cabinet was already wired for JAMMA, I went with a J-PAC and an ArcadeVGA.
--- End quote ---
iwillfearnoevil:
--- Quote from: pcates on January 11, 2005, 10:51:58 am ---I did not think you needed an arcade VGA if you got the jpac. I thought it handles the signal for the arcade monitor. Am I mistaken??
Thanks,
Patrick
--- End quote ---
the j-pac just makes sure the signal is at 31mhz. if your video card is not at 31mhz it just won't let a signal through. you can use lots of video cards if you are okay running advancemame in dos or there's powerstrip for windows that lets you run at a different frequency. check out this page for some various video card reviews for mame plus more info you'll prolly find helpful.
edit: thanks for the correction peale. i was on autopilot typing that up :)
SirPeale:
--- Quote from: jened on January 11, 2005, 11:15:28 am ---the j-pac just makes sure the signal is at 31mhz. if your video card is not at 31mhz it just won't let a signal through. you can use lots of video cards if you are okay running advancemame in dos or there's powerstrip for windows that lets you run at a different frequency. check out this page for some various video card reviews for mame plus more info you'll prolly find helpful.
--- End quote ---
You got it backwards - it makes sure the signal is @ 15KHz, not 31.
krick:
--- Quote from: pcates on January 11, 2005, 10:51:58 am ---I did not think you needed an arcade VGA if you got the jpac. I thought it handles the signal for the arcade monitor. Am I mistaken??
Thanks,
Patrick
--- End quote ---
Technically, you don't. However, bear in mind that the J-PAC is not a video converter. The signal divider feature is just a safety device to protect your arcade monitor. You still need a video card capable of being reprogrammed to output a 15KHz signal.
Check out the "Hardware" link on EasyMameCab for more information...
http://easymamecab.mameworld.net/
danny_galaga:
--- Quote from: paigeoliver on January 11, 2005, 08:29:50 am ---Since I first used the Jpac I now reccomend them for everyone, not just people using arcade monitors. Wiring is simple and easy with a JAMMA harness. Not to mention a lot less fragile. Plus the J-Pac makes swappable panels a breeze.
If you have a J-Pac and a Bob Roberts JAMMA harness then you won't even have to THINK, as every wire will be labeled for you.
--- End quote ---
yes, yes! i like not thinking! that's completely gelled my plan for my upright then...