Search found 44 matches

by romibraman
Mon Jul 23, 2018 4:48 pm
Forum: NESdev
Topic: Problem on a NESRGB modded Famicom AV
Replies: 0
Views: 6295

Problem on a NESRGB modded Famicom AV

Hey guys, I have a problem with one of my nesrgb modded Famicom AV. The console run perfectly for about 5 minutes. Then some of the sprites go all the place. https://i.imgur.com/dfB3ljVl.jpg If I reboot my console, the artefacts are still there. If I let it rest for a few minutes and restart it, it'...
by romibraman
Fri Feb 16, 2018 2:53 am
Forum: NESdev
Topic: [FIXED] NESRGB / Twin Famicom image interferences
Replies: 17
Views: 4262

Re: [FIXED] NESRGB / Twin Famicom image interferences

Got my new cable this morning. It works perfectly. So much time wasted, for a faulty cable.

Anyway thanks Lidnariq, you were a great help.

Romi
by romibraman
Thu Feb 15, 2018 5:06 pm
Forum: NESdev
Topic: [FIXED] NESRGB / Twin Famicom image interferences
Replies: 17
Views: 4262

Re: NESRGB / Twin Famicom image interferences

lidnariq wrote:Hm. I'd still try to get something connected to the outer shield, by whatever means.
Ok just did it, it had no impact.

It still feels like this cable is really low quality though. I think I will wait for the new one before experimenting some more.

Thanks again for your help.
by romibraman
Thu Feb 15, 2018 4:26 pm
Forum: NESdev
Topic: [FIXED] NESRGB / Twin Famicom image interferences
Replies: 17
Views: 4262

Re: NESRGB / Twin Famicom image interferences

I'd try adding a wire between ground and pin 21. Ho that's another thing, there's no pin 21. I almost messed up because of this because I thought pin 17 was in fact pin 19. If you look at my picture, you can clearly see the black wire going to pin 17 then next to it, pin 19 is not wired (as expecte...
by romibraman
Thu Feb 15, 2018 4:08 pm
Forum: NESdev
Topic: [FIXED] NESRGB / Twin Famicom image interferences
Replies: 17
Views: 4262

Re: NESRGB / Twin Famicom image interferences

So, waiting for my new cable, I've decided to open the old one to check it. It seems to be a real mess, no shielding at all, resistance & caps everywhere... https://i.imgur.com/7eH7Qtrh.jpg I've followed Tilm Worthington schematic and I've noticed a few strange things https://etim.net.au/nesrgb/inst...
by romibraman
Wed Feb 14, 2018 3:36 pm
Forum: NESdev
Topic: [FIXED] NESRGB / Twin Famicom image interferences
Replies: 17
Views: 4262

Re: NESRGB / Twin Famicom image interferences

Not specifically, other than vaguely validating. Anything else I could try to confirm your theory? I mean ground is the obvious culprit. But a faulty cable (or Din) still feel like real bad luck. Another thing to note. The Twin Fami is supposed to use a 7.5 PSU. I don't have any so I'm using a 9v w...
by romibraman
Wed Feb 14, 2018 2:51 pm
Forum: NESdev
Topic: [FIXED] NESRGB / Twin Famicom image interferences
Replies: 17
Views: 4262

Re: NESRGB / Twin Famicom image interferences

Just to be clear, I suspect this is actually the first place to look. When I did this the white dot were much more visible when the Din 8 ground was wired directly to the nesrgb ground than when it was wired to one of the composite port ground (on the second case the size of the wire is just a few ...
by romibraman
Wed Feb 14, 2018 8:12 am
Forum: NESdev
Topic: [FIXED] NESRGB / Twin Famicom image interferences
Replies: 17
Views: 4262

Re: NESRGB / Twin Famicom image interferences

Ideally, your cable should have a braided wire jacket around the outside, like "B" in this picture: https://commons.wikimedia.org/wiki/File:RG-59.jpg Try measuring the resistance between the two outer metal rings, and especially seeing if it changes as you flex the cable. Ok, I have ordered a new c...
by romibraman
Tue Feb 13, 2018 5:59 pm
Forum: NESdev
Topic: [FIXED] NESRGB / Twin Famicom image interferences
Replies: 17
Views: 4262

Re: NESRGB / Twin Famicom image interferences

Anyway, if things get better when you connect composite video or audio, you've got problems with your cable having a lousy ground connection. You don't need to worry about the actual wires that are carrying the signal, but check the structurality of the shield and grounding pins on the connector an...
by romibraman
Tue Feb 13, 2018 4:29 pm
Forum: NESdev
Topic: [FIXED] NESRGB / Twin Famicom image interferences
Replies: 17
Views: 4262

Re: NESRGB / Twin Famicom image interferences

... There's two dots per NES pixel? You've got something very weird going on. Hey Lidnariq, good to hear from you, it's been a while. I'm not sure I follow what you mean by "There's two dots per NES pixel". The interference I'm talking about are those white dots all over the black area on the top p...
by romibraman
Tue Feb 13, 2018 7:40 am
Forum: NESdev
Topic: [FIXED] NESRGB / Twin Famicom image interferences
Replies: 17
Views: 4262

[FIXED] NESRGB / Twin Famicom image interferences

Hi all, I'm done with modding a TWIN Famicom and I have an issue I can't get to troubleshoot. I'm using the the original RF modulator port. The issue is I have small interferences particularly visible on the blacks. Like tiny white dots all over the place. Where it gets strange is that I can remove ...
by romibraman
Mon Oct 30, 2017 4:27 pm
Forum: NESdev
Topic: Jailbars on a front loader - help required
Replies: 59
Views: 10620

Re: Jailbars on a front loader - help required

Maybe a picture? I don't suppose you know anyone with an oscilloscope? I have ordered new bigger potentiometer. It will make make much better test, I’ll send a picture then, probably even a video. I can try to find an oscilloscope , what test do you have in mind? Thanks again for your help .
by romibraman
Mon Oct 30, 2017 3:35 pm
Forum: NESdev
Topic: Jailbars on a front loader - help required
Replies: 59
Views: 10620

Re: Jailbars on a front loader - help required

The interference I get is so strong that I seem to get the best results around the 200k. Does it sound possible to you ? I don't even have a guess. You could say almost any value in the range of 10k to 10M and I'd believe it. I meant to suggest a fixed resistor *and* a potentiometer, so that the mi...
by romibraman
Mon Oct 30, 2017 1:59 pm
Forum: NESdev
Topic: Jailbars on a front loader - help required
Replies: 59
Views: 10620

Re: Jailbars on a front loader - help required

To be honest, mixing in a little bit of "NOT PPU A13" is a dirty hack, but I'm glad it's working for you. The problem is that both sides of "too much" or "too little" being mixed in will look very similar—the only difference being it moving by 4 pixels left/right. If, as you say, they don't move le...
by romibraman
Mon Oct 30, 2017 11:12 am
Forum: NESdev
Topic: Jailbars on a front loader - help required
Replies: 59
Views: 10620

Re: Jailbars on a front loader - help required

https://console5.com/wiki/File:NES-001-Schematic---CPU,-PPU,-RAM,-CIC.png Looks like pins 5 (PPUA13) and 6 (NOT PPUA13)? You crazy SOB it worked.... it freaking worked ... First I tried pulling PPUA13 to make sure I was not crazy and it was absolutely clear there was no jailbars at all. So first I ...