Aug 112011
 

Quick update, the latest prototype PCBs arrived a couple of days ago. Assembly is in progress. This revision reduces audio noise from the DAC. This was a problem with 1CHIP SNESes which introduce much more noise, presumably due to their much steeper signal edges on the bus. The noise disappears when using a “custom chip game” case with the additional grounding prongs. I didn’t want to rely on that though, hence the hardware update. ;)

Here they are. I hope this is the last hardware revision, all those prototype PCBs are getting expensive…

sd2snes Mk.II Rev. E, front

sd2snes Mk.II Rev.E back

sd2snes Mk.II Rev. E, back

 Posted by at 5:20 am
Aug 012011
 

I did this a while ago and thought it might be interesting. The 1CHIP SNES (1995~), with S-CPU, S-PPU1 and S-PPU2 united in a single chip (S-CPUN), has vastly improved picture quality over the old versions. Most notably the rising edges of the output signal are much steeper, resulting in sharper dark->bright transitions.
This is not an issue of the video encoder, it looks exactly the same via RGB (save for color balance).
Here are some examples to show the difference.
Sorry the pictures turned out quite big but it’s important not to lose any detail here. ;)
The images below show three frame captures from a “regular” SNES. Roll over them to see the 1CHIP version.

NINTENDO praesentiert

Shot 1


Yoshi's Island intro

Shot 2


sd2snes menu

Shot 3

shot 1 - old SNES
shot 1 - 1CHIP SNES
shot 2 - old SNES
shot 2 - 1CHIP SNES
shot 3 - old SNES
shot 3 - 1CHIP SNES
 Posted by at 10:26 pm