nesdev.org

Manual printer arrived this morning, label printer arrives monday, Ciclones are hopefully on their way, cart plastics are shipping from HK soon, tons of boring stuff coming together :) Got one more try to find a box... Haven't had any time to do mappers so no updates there. As always it is 2-4 weeks...

Why would you want to break your game on clones?

It wasnt to purposely break games on clones, just something that might come up that does break them.

Using just one ground pin works fine on normal NES so some peeps (like me) might just assume it would be fine on clones too.

Bank switches happen instantly on all mappers, so the next instruction comes from the new bank. Only limit to the speed is how fast you can do the write. Could set it up to do 3 bank switches in 3 instructions using a/x/y. That is the reason a microprocessor cant be used as a replacement for a mappe...

Yobo (USA version) also has the ground requirement. None of those clones have internal games but it could definitely be left over from other NOAC designs.

For those building their own PCBs I stumbled on a key way to make your board fail on the clones NEX and FC Twin. For some reason on both systems the two GND pins on the cart must both be connected. Only using one of them gets you a voltage of ~3V instead of 5V, likely a grounding issue. Don't know t...

What is "bad mapper"? Bad mapper is any of the FFE hacked ones, anything with more than 512KB prg or chr, and the FDS. There shouldnt be any mappers that have bank switching too small to work. 9 (P*ROM) buggy, 10 (F*ROM) good. Aren't they the same thing except for the difference between 8...

I am sick so hopefully this is coherent! Will your board work with the GameGenie and ProActionReplay? GameGenie devices would probably break the boot rom, which is why I added support for 5 codes. There is space on the fpga for more Game Genie hardware so that 5 could be upgraded later. perhaps you ...

Its not a matter of IF it will go into production, its WHEN I will have all the parts to sell it. The first 100 boards are already made. Waiting on new cart plastics which I hope will be 3-4 weeks but that is China schedule so it could be 6 weeks... When the first batch is sold I will be able to low...

Will programs other than the menu be able to read and write from the FAT file system on the CF card? Getting other apps to use the CF card would be an interesting process. The game would have to load some code into the internal sram, that code would have to enable the boot rom and call the card rou...

Split from here : NES flash cart is more complex than anything Tototek has done because of all the mappers. I wish I could do preorders on my NES flash cart ( www.nespowerpak.com ) but I have learned that is a bad idea when dealing with China fabs. Main part left is making new cart plastics. I have ...

Solder mask is the (usually) green coating on the board that covers the traces. It masks off areas where you don't want solder to go.

Silk screen is the (usually) white text, chip outlines, or other drawings on the board.

I used to use expresspcb.com until I wanted to get higher quantity boards. Then I couldnt take the files their software produced to anyone else. pad2pad.com is another company that provides their own software. There are free versions of Eagle so I think making standard gerber files is a better idea ...

More on the same topic, Shaffle Fight also needs chrRAM. If the rom file doesnt have a chr section, it needs a ram chip.

My lists show Crystalis has 128KB of chrrom, but Project Q (j) needs 8KB chrram. You will have to solder in a ram chip like a 6264. Will also need to add the chr /wr signal because the crystalis board is unlikey to have it. If the game is running and you get sounds the prg wiring is probably all cor...

The timer counter is entirely hardware so no GG code will change the time. Game Genie can only work on the rom space, so you wouldn't be able to change the timer code stored in wram either. You could use the game genie to change the irq vector to a location that has rts, meaning that when the irq tr...