nesdev.org

take a look at my old posting:

viewtopic.php?f=12&t=5886

the logic gate chips involved doing the chip select were the 74ALS series.

Pasky, PPU2 outputs the analog video signal. before that everything is digital. Your efforts do narrows things down though, thanks. PPU2 has a lot of pins, but isn't that complicated internally as far as digital logic. It does have a lot of multiplexers, shift registers, and the D/A converters, thou...

Tom and Jerry on the SNES in general, especially the boss music:
https://www.youtube.com/watch?feature=p ... ZcGg#t=76s

Could someone with a quality benchtop adjustable power supply and a SNES/TV combo that shows this problem try something simple? 1) Set the benchtop power supply to 5.00V DC and current limit to 1 Amp. be 100% sure it's at this voltage. Nothing more. 2) Just don't use the 7805 regulator, and connect ...

As for that vertical bar fix, I tried it and also didn't get result . A beefier PSU didn't help either and I had the same or very similar board as shown in previous post by TmEE. What do you mean by beefier PSU? Are you talking about either a stronger AC adapter, or did you use something other than...

A22 isn't connected to anything on the daughterboard. I tried grounding it, but no change. I'm kind of grasping at straws here, and I'm a bit tired, but it wouldn't have anything to do with LoROM not having A15 connected, would it? That happens before the address decoder, right? The maskROM pinout ...

Let's start with some of my assumptions: 1) This is essentially a daughterboard that plugs into where the maskrom normally is on the cartridge. You are using donor boards that have only one mask rom chip. 2) You just load a (headerless) rom image onto the flash chip with no trickery involved. Just a...

psycopathicteen, With what you know and have done already, maybe it's time for you to write this tutorial? As for how I got my first real job, showing in my portfolio some tutorials I wrote and (graphing calculator) games I posted on the web held a lot of weight. It shows you can think clearly about...

blargg wrote:The anode goes to the positive from the adapter, the cathode to the regulator. Basically think of the stripe as the negative, since it's like a negative symbol.

Yep exactly.
I screwed up when measuring it. The meter I have identifies the Anode with the red lead, after testing.

hmm. I'll check the meter I used to see if it identifies diodes backwards (at this point in time these cheapo LCD meters can be wrong about most anything). If it does I'll update the post above.

Great to see another SNES back in service again

Nintendo learned first-hand of save data corruption on the NES, and I'm sure their management wanted to progress from some boilderplate statement of "hold reset while powering off the unit" to avoid save data corruption. Then perhaps the permanent solution is to find some unused area of f...

Power switchover is something I'd need to think about more, but the ba6162 appears fairly simple. I know the ba6162 gets more fancy, but shouldn't a pair of Schottky diode should be sufficient? No, because of the chip select blocking to avoid data corruption. You want to avoid writes during Reset/p...

I believe D1 to be a SOT89 package. (measure it! It should be 4.5mm across horizontally as shown in your photo. if it's something else like 6.5mm, please tell me). It is a schottky diode. It needs to be rated for at least 1 Amp "average rectified output current". (1 amp continuous forward ...

honesty it could be any component after the switch that is a near short circuit. there are real schematics floating around the internet. http://img37.imageshack.us/img37/8863/snscpugpm0102.png J1 in the top middle-right of the schematic here is the power input. I see the diode D1 you are talking abo...

Maybe there are such conventions, but they aren't advertised effectively or aren't talked about enough. Interesting story is that on my way back from the MGC, I struck up a conversation with a gas station attendant about my day. He hadn't heard of the MGC yet, despite being an hour's drive away from...