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acem77
Joined: 25 Jul 2003 Posts: 180 Location: usa,ohio
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Posted: Sun Dec 23, 2007 8:05 pm Post subject: |
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kyuusaku wrote: | Yup the cap is in the console, it's a 68pF. It's there to slow the signal's transition. You should try adding it. |
so there is a 68pF cap i can remove and reuse in place with the rgb ppu?
sorry kind of confused?
if that is the case i can do it now and not order and wait for a part. |
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kyuusaku
Joined: 26 Jul 2003 Posts: 941 Location: .ma.us
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Posted: Mon Dec 24, 2007 4:37 am Post subject: |
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Yeah, there should be a 68pF capacitor on the /RD line inside the console. Are you sure it's not there? If it's not, before ordering a single capacitor, take it out of your other NES and put it into the RGB NES to see if it fixes the problem with the PowerPak. |
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acem77
Joined: 25 Jul 2003 Posts: 180 Location: usa,ohio
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Posted: Mon Dec 24, 2007 5:45 am Post subject: |
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i have tested super mario running on the powerpak and the original cart with a variable cap in my rgb nes.
i have included a wmv of each with real time video and sound as i adjust the cap.
if i use any cap the image the original games gets corrupt. i its kind of cool to see the effect as i slowly adjust the value.
if i use the cap on the powerpak mario will start to run but with corrupt gfx.
http://www.greatlakesvista.com/rgb/nes/mario_rgb_cart.wmv
http://www.greatlakesvista.com/rgb/nes/mario_rgb_powerpak.wmv
i have 3 values of variable/trimmer caps.
103
105
472
i do not think i will get the rgb nes to work perfect with this method.
but there is a sign of hope. |
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kyuusaku
Joined: 26 Jul 2003 Posts: 941 Location: .ma.us
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Posted: Mon Dec 24, 2007 6:29 am Post subject: |
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Those caps are way big, you'd need to trim them down to nothing. You just need a cap marked "680" which is 68 x 10^0 pF.
So your other NES doesn't have one? |
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acem77
Joined: 25 Jul 2003 Posts: 180 Location: usa,ohio
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Posted: Mon Dec 24, 2007 6:38 am Post subject: |
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did not see one? where should it be some where near the ppu? |
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kyuusaku
Joined: 26 Jul 2003 Posts: 941 Location: .ma.us
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Posted: Mon Dec 24, 2007 8:03 am Post subject: |
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It's not necessarily near the PPU, follow pin 24 from your PPU until you come across it. If you didn't take it out, it should still be there. The capacitor is in the Famicom and NES and Playchoice schematics. Playchoice has a jumper though to connect another 100pF cap in parallel with the 68pF cap to make 168pF, so you might want to try that too! |
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acem77
Joined: 25 Jul 2003 Posts: 180 Location: usa,ohio
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Posted: Wed Dec 26, 2007 5:06 am Post subject: |
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pin 24 on the ppu goes to pin 21 on the nes cart slot. i do not see any caps in the path.
i know i never removed anything like that when doing the mod.
i have also looked at a 2nd unmodded nes. |
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kyuusaku
Joined: 26 Jul 2003 Posts: 941 Location: .ma.us
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Posted: Thu Dec 27, 2007 2:15 am Post subject: |
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You know it could be *beyond* the connector on the "trace" right? |
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acem77
Joined: 25 Jul 2003 Posts: 180 Location: usa,ohio
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Posted: Thu Dec 27, 2007 3:45 am Post subject: |
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kyuusaku wrote: | You know it could be *beyond* the connector on the "trace" right? |
i traced every path till it ends? after that is a cart if pluged in????
any jpg pics? |
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kyuusaku
Joined: 26 Jul 2003 Posts: 941 Location: .ma.us
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Posted: Thu Dec 27, 2007 4:59 am Post subject: |
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Where does it end though? It must be there. I don't have a NES or I'd take a picture for you. |
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acem77
Joined: 25 Jul 2003 Posts: 180 Location: usa,ohio
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Posted: Thu Dec 27, 2007 5:48 am Post subject: |
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from pin 24 on the ppu it crosses from one side of the mb to the other side a few times then it ends at the edge of the mb pin21 to the cart slot adapter. |
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rbudrick
Joined: 26 Mar 2004 Posts: 373
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Posted: Fri Jan 04, 2008 10:57 pm Post subject: |
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kyuusaku wrote: | Where does it end though? It must be there. I don't have a NES or I'd take a picture for you. |
No NES?
To the gallows!
-Rob |
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kyuusaku
Joined: 26 Jul 2003 Posts: 941 Location: .ma.us
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Posted: Sat Jan 05, 2008 12:39 am Post subject: |
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Of course not, why get a NES when I have a NES adapter? I haven't owned a NES since 10 years ago when I traded my childhood collection in at Funcoland |
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rbudrick
Joined: 26 Mar 2004 Posts: 373
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Posted: Fri Jan 11, 2008 6:02 pm Post subject: |
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Blasphemy.
-Rob |
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acem77
Joined: 25 Jul 2003 Posts: 180 Location: usa,ohio
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Posted: Wed Jan 16, 2008 3:19 am Post subject: |
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grr no replies from the powerpak creator....
ask 2 basic question one if he would help or if not post the powerpak does not work on rgb nes systems in his faq.
no reply i wish i could find out one way or the other just for closure |
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