nesdev.org

I just metered out my board and it matches the BA6591AF schematic to a T. Awesome. Would you be able to tell me what voltage you have on pins 10 and 24? I wonder if diode isolating the amplifier would be helpful with your green hue... I'm no genius when it comes to circuit design so who knows. Well...

So I've had some success with the amps, but let me explain... First, just so we're all on the same page. When I talk about the encoder's output pins, I'm talking about pins 1 and 24. When I'm talking about the input pins, I'm talking about pins 10 and 11. So like I said before, the voltage on the ou...

OK, so I've lifted pin 9 on the video encoder and connected it to 5v and now everything appears to be correct. Though I wish I could have a look at the datasheet for the S-RGB just to be sure there isn't anything else.

So looking at the encoder in my PAL SNES, pin 9 is connected to pin 11. They are both ground. I took a look at the encoder inside my NTSC SNES mini, pin 9 is 5v. So I'm assuming that all I have to do is lift pin 9 in my PAL SNES and connect it to 5v and all will be good.

OK, so I got around to doing this. My PAL SNES is the 1chip version with combined CPU and PPUs. On my PAL SNES, I lifted pin 111 of the S-CPUN and connected it to ground. I swapped X1 with the crystal from an NTSC SNES. I also swapped the lockout chip with one from an NTSC SNES. When I tested it wit...

http://www.mediafire.com/?2x9erpy79q69o8t ^ That's a link that Drakon posted on Racketboy. The download contains two datasheets as well as a schematic for an early version of the SNES. I suggested a while ago (in the Racketboy thread) taking Pr and Pb from the inputs rather than the outputs of the e...

So am I correct? The PPU is the same in an NTSC and PAL console? If I change the PPU pin(s) from +5v to ground, it'll be the same as an NTSC PPU?

Mike, other than getting Pr and Pb to the correct levels, there's one other problem that I've seen virtually NO one talk about. There's a LOT of voltage on those lines. I measured over 3 volts on the Pr and Pb lines, 3.321v if I remember correctly. While I don't know what the appropriate voltage sho...

From everything I've read, I've always thought (or incorrectly assumed) that the SNES PPU was the same in all console. The PPU could be set to output PAL 50 Hz or NTSC 60 Hz. After mentioning on another forum that I wanted to use a PAL SNES as an NTSC SNES (I'm in the USA), some one warned me that I...

I've ordered some op amps. I'm very eager to install them as soon as I get them in the mail. I'll post my results soon.

I'm not disagreeing, I think the S-Video's Y works fine. I wasn't talking about Y. Pr and Pb is what I'm after.

I recently re-did this mod, using two 220uF capacitors on the Pb and Pr chanels. For Luma/Y, I used the one from S-video. They are the same, after all! Doing this resulted in a very clear image with proper color balance and proper saturation. Mike, the problem though is that what might work for you...

The correct use is: output pin -> high impedance 6 dB amp (PNP input) -> 100 or 220 uF C -> series 75 ohm R -> out For the best video quality you'd need 2x video amplifiers, on Pb and Pr. TI makes pretty good video amplifiers. Basically connect the outputs to the amplifier's inputs. How to connect ...

Be careful when ordering them used. Make sure the seller has a good return policy. I've gotten a few from eBay with bent legs, and I also have had one or two chips that legs broke off of when trying to straighten them. I ordered some from BuyICnow before. The legs weren't bent, but I had to clean so...

Hey guys. My name has been thrown around in this thread here and there, so I thought I'd chime in. I'm not here to try and argue with any one, I just wanna tell you my personal thoughts on the matter. First off, now that Retro Zone has the Star Ocean reproduction available, I will no longer be modif...