nesdev.org

FitzRoy: thanks

shadowkn55: It comes with the battery installed. I couldn't get any nice PCB mounted batteries tho. The EEPROM is for ROM information, like HIROM/LOROM and Save RAM size

Its too bad there aren't any better solutions then using a battery backup

I am pleased to announce the SNES flash carts are now on sale on http://www.mash-mods.com! I have gotten some interest from forum members so I though I would let you know. I can also do support here.

Currently there are only 16 programmers and 21 cartridges available.

To program a CPLD in-system you need to connect the JTAG port to the microcontroller Altera and Xilinx can export JTAG commands in a binary form that can be played back by a microcontroller to configure the part. This would also eliminate the need for a separate programmer. You could do this to swit...

It actually looks like a good design, I see why you chose those bus switches If you want to use the FTDI chip for USB, you can defiantly place it on Bus1 As kyuusaku mentioned, the CPLD can probably be reduced. You can actually use a 3.3v CPLD with 5v compatible inputs. It wont get fried by the 5v a...

Bus bufers are great (different from a bus switch). I used 3.3v logic for everything, the chip 74LVC4245A can convert 5<->3.3v for the data bus and 74LVC541 does 5->3.3 for the address bus. I also used a 3.3v CPLD by Altera that can accept 5v signals, so its impossible to break it. I didn't know Cyp...

Holy cow 500 bucks. Everything on Digikey is about 5x what it really costs, and it adds up.

What are the most expensive parts? Perhaps some clever designing can cost reduce it.

cd_vision, thanks.. I guess! lol

cd_vision, I developed a SNES flash cart and USB programmer. Its going to be on sale real soon now! I will make an announcement in the SNES forum when it is. I love FTDI chips! I always use the parallel version, you can connect it to a data bus and have the MCU control it. With this you should be ab...

Whoa Sweet

It uses flash memory right? And the little MCU can remember the settings.

Good job with the prototype! I usually just order the boards and they work

So you fixed it?

Interesting, changing the battery would have deleted the SRAM too

Your battery is fine, ignore what I said. You are making 2 game boards Have you read this forum? http://nfggames.com/forum2/index.php?topic=1382.0 Also, what sort of graphical glitches were there? Do they happen at the same place? The best mod would be to get 2 CIC chips. One NTSC master to keep the...

I am not familiar with this mod, but will give it a shot So you soldered on a new ROM and it boots up fine? Thats good news, if any pins were missing or wrong it wouldn't work How did you attach 2 batteries? I don't really like this idea, one battery lasts over 10 years anyways, and 2 has the possib...

I wonder if the cap would work for the powerpak

That sounds way better then cutting 8 traces and soldering resistors over them

This forum is pretty quiet recently, so I though I would share something with you. My flash cartridge had a very interesting bug, the CPLD chip was too fast! It would cause graphics corruption in certain games like Donkey Kong Country, and if I turned on the 'turbo bits' to speed up the chip it woul...

NES emulators do support pirate multicarts and their strange mappers, so I guess the roms are available somewhere

You will have to re-create the mapper yourself, but it is usually made of simple chips. See Kevtris's site for more info http://www.kevtris.org/

droppingsload???

Here is a quickie program that simulates your LFSR You are right, it does have 127 positions and each number only occurs once before it repeats. What happens to bit 0-2? I am leaving them 0. Once we get that then when we can decode the ROM into linear order! :) :) edit: So the stack is 10 bits as we...