nesdev.org

So....is pin 9 on WRAM a 'no-connect'?

So what exactly did he do?

Lifting pin 7 on wram doesnt allow any game (or flashcart) to boot.

I could give that a shot as well. I've got 2 SNES's with REALLy bad bars.

I'll try lifting the pin this weekend.

As far as the bar goes...I've got a couple snes's that have more than 1 bar on the screen. I've got one with one in the center, on the right side of the screen and middle left.

I think the jailbars come from something completely different, like ground bounce.

Thanks.

Are the CPU and PPU not decoupled?

These reproduction posts are getting old really fast =/.

I've only managed to find 2 and they don't show the entire circuitry for the board (for instance, the vcc circuitry for the CPU and PPU are missing, that or I've missed an oversight in both of them). These are the two I know of: http://i.imgur.com/yUnIQeFl.jpg http://i.imgur.com/SqrvcB7l.jpg

Wrong section.

Loopy's MMC5 mapper only seems to work well with castlevania 3. All other MMC5 games I've used don't work properly and eventually lock up (Uncharted Waters, L' Empereur). I'd love to see MMC5 fully implemented.

Here's the DRAM refresh at 50ns with measurements displayed:



And @ 200 ns with measurements:



Here's a close up of the spikes in relation to the PPU:

More late night probing: Channel 1 [Yellow]: PPU2 Vcc [Pin 5] Channel 2 [Blue]: Dram Refresh [Pin 40 CPU] http://i.imgur.com/Diqhxbl.gif Channel 1 [Yellow]: CPU Vcc [Pin 1] Channel 2 [Blue]: Dram refresh [Pin 40 CPU] http://i.imgur.com/cOjmOHT.gif Definitely correlation between the DRAM refresh and ...

I added .0.1uF caps to all 4 VCC lines (in parallel) on the cpu and PPU2 and no change. Verified through composite that it's still present as it shows up more through composite and less through RGB: Composite: http://i.imgur.com/dU4P2ALl.png RGB: http://i.imgur.com/DqbhZh5l.png Checking the CPU/PPU2...

http://imgur.com/a/hM763#0 ^ Capture of pin 5 after putting a .1uF cap on it. There seems to be some sort of spike in frame 48. Keep in mind im no expert and still learning the ways of using an oscilloscope. Also I wanted to ask, is there a pin or voltage specifically for the DRAM? I'd like to probe...

Got my scope and had some play around time today. I couldnt find my SNES with the heavy vertical bar, but I did find the one that has it very faint: http://i.imgur.com/kCEL8Bwl.png Here's the noise on pin 5 of ppu2: http://i.imgur.com/Tv6YufL.png Pin 32 not as much: http://i.imgur.com/45i85QL.png Pi...