NES 2 (top loader) Commissions for: Onyxdomain

After finishing the toaster this morning I set to work on the nes 2. After making a royal mess of the desoldering I changed the desoldering iron to a new head and suddenly desoldering was super easy. I cleaned up the mess and fixed all the broken traces but I was getting garbled graphics. I double and triple checked my repair job and all looked good. Next I pulled up the famicom schematic so I could probe each ppu connection since the system was indeed running just the graphic tiles weren't right. Unfortunately the famicom schematic tells you where the ppu would connect to the cartridge connector of a 60 pin famicom cart instead of a 72 pin nes connector. Therefore I pulled up the mighty ben heck nes to famicom pin chart and used that in conjunction with the famicom schematic to figure out where the ppu pins were supposed to connect. After spending the entire day checking my work and probing I found the dead connection and the machine was finally restored. Indeed the dead ppu connection was from a connection and trace that looked perfectly fine and had no damage do it...







Anyway this nes 2 now has the ppu precision socket installed. I also swapped out the chip that lets you use the powerpak with a rgb ppu. And I even desoldered the rf box and removed the back plate since I'll later be installing a multi av port into the back plate.

Aaaaaanyway. Wired up the video circuit of the kit with the cxa2075 upgrade and installed the rc2c05-04 ppu with the two ic circuit needed to make it work on a home console. Wired it all up and it worked perfectly first try:





point for gryffindor!

I did some more work on this system but couldn't be bothered to take pictures. I installed the multi av port in the back....that's all for now

I built the audio circuit and wired it up. I also wired the c45 and c46 connections into pins 16 and 17 of the nes connector (these pins are unused they normally go to the expansion port and that's all). I modified my famicom to nes adapter to connect pins 45 and 46 to nes pins 16 and 17 and it works great. I can stick a famicom cartridge with upgraded audio into the adapter, plug the adapter into the system, and get amazing quality audio with the upgraded audio mixed in. Keep in mind that the upgraded audio will only get mixed in when the system is switched to kit audio mode. Unfortunately there's no way to get powerpak extended audio without either building an adapter for the powerpak out of a game genie or soldering inside the powerpak which I don't wish to do:



All that's left to do is wire the outputs into headers and connect them to the multi av port at the back. Then I just re-install the heatsink close the case and this awesome system's done. Oh yeah and I have to wire up the audio switch which will be easy for this system.

People must laugh when they see I have two consoles being done by you at the same time.

Well guess what people, it's my 3rd!! Drakon is just that good.

OnyxDomain wrote:

People must laugh when they see I have two consoles being done by you at the same time.

Well guess what people, it's my 3rd!! Drakon is just that good.

Haha. Interestingly enough I'm still making discoveries with how to improve these systems.

okay I've been doing more famicom related work lately there's good news and bad news. The bad news is that audio circuit on these av famicom kits is specifically tailored to the audio circuit found in the av famicom. The nes 2 has a completely different audio circuit than the av famicom so it didn't sound good when I wired the kit into the audio pins of the nes 2. I disconnected the nes 2 audio from the onboard circuit and re-created the first four resistors of the famicom audio circuit and this made it sound much better but still not quite as good as the av famicom. I also got hit with a bunch of new commissions so I don't know when I'll next have free time to do experimentation. I can try buying 1/8 watt resistors and seeing if that helps at all.


The GOOD news is that I've perfected my clock divider circuit that improves the s-video quality. There was a major flaw with the circuit I built before causing it to go in and out of working but after poking around I found the fix.