nesdev.org

Actually I think I was wrong about it even using flash memory. If you look at the text beside the chip, it says FRAM.

But definately no battery, either way.

Useful references: NES mask rom pinouts . EPROM pinouts . Or better yet, check the datasheet for your specific chip. NES to EPROM conversions . I didn't use this one myself since I was using an eeprom, but it seems to have all the good stuff for normal eproms. Also something to keep in mind is that ...

I'm sorry to say that I'm pretty sure no versions of Gyromite were ever the right board type to play Megaman 1. NROM is just a bare board with a PRG and CHR rom. Megaman used the UNROM board, which uses a couple of extra standard logic components to allow for bank switching. I myself used Silent Ser...

What's cheap about epoxy? It's inexpensive, but I don't think there are any reliability problems. It's what Nintendo itself used in the really-mass-produced SMB/Duck Hunt cartridges, because it was less expensive. Well epoxy might be just as good in the long run, but it certainly lacks the nicety o...

I don't think of myself as some master genius of any sort, but there's always that tiny bit of letdown when one thinks of something on their own, only to realize everyone else already knew it already. lol.

I thought some folks might find this of interest, so I'll crosspost: - - - I finally got me a tri-wing screwdriver dirt cheap, so I thought I'd start opening everything ever that uses those silly screws. Namely, my Gamecube controller to try and fix the C stick, and some GBA cartridges. Once upon a ...

It's even easier: instruction: lda #5 sta instruction+1 I actually tried that just yesterday, when trying to figure out the best way to squeeze some code into a small gap in a rom. But it was one of those possibly too good to be true types of things, since I wasn't completely sure of the consequenc...

Ah right, I forgot to check MMC5, since not many games ever used it. I also remembered that big list of mapper info in the NES Specifications page and skimmed over that, and while there's a few other small-time ones which don't matter, it seems MMC5 and Namco106 are the only ones to worry about. I p...

All I do in my NROM to UNROM conversions is just write to the rom address space in an area which holds the same value as what I'm trying to write, that way the correct value ends up on the data bus despite the conflict. In my case though it just means looking for a "1" somewhere, since I u...

I know that the disk system takes advantage of the $4020-5FFF address range for its system bios and registers, but I was wondering if there were any actual games which used this for anything? From what I can tell, all the better-known mappers stick into the $8000+ range, though I could be mistaken. ...

Back when I put together my breadboard version of an UNROM board, I would tend to get some graphical corruption sometimes. Games would generally start out fine, but once you played them for a few minutes, some would start to get corrupted sprites. And only sprites, mind you. The background was alway...

The horribly tedious work of continuity testing has given me a preliminary pinout: 01 - GND 02 - PRG_ROM #2 (A16?) 03 - PRG_ROM #3 (A17?) 04 - PRG A14 (n) 05 - PRG A13 (n) 06 - 07 - 08 - 09 - PRG A0 (b) 10 - PRG D0 (b) 11 - PRG D1 (b) 12 - PRG D2 (b) 13 - CHR_ROM #2 (A16?) 14 - CHR_ROM #3 (A15?) 15 ...

I got to thinkin, since it's just 40 pins, where as the surface-mount version is 44, I'm going to bet that this one doesn't support WRAM. Unless someone has a pinout available, I might have to follow the traces myself and see what I can come up with. Also, does anyone have the pinout of the 32-pin 1...

While looking for games on Ebay to cannibalize, one of the carts I ordered was Roger Clemens MVP Baseball. nesmapper.txt said it was 128k PRG/256k CHR MMC3, and while boardtable.txt said it was 53361, boardnames.txt had no information on the board. But I figured as long as it was MMC3, it was probab...

The problem with those blue power LEDs is that they are very distracting, which isn't a good feature for an entertainment box that sits near the TV. Like good user-interfaces, the goal is to avoid drawing attention away from things that matter. lol it's true, it lights up the room enough with the l...