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I see what I thought was a simpler way to do this, I replied on twitter, but it could use some elaboration. I had a Teddy Ruxpin when I was little, so it's kinda fun to think about. The MP3/WAV player chip on GTMP3 is controlled asynchronously, it's just 9600 baud and can be controlled easily throug...

What game is it? It could just be that the game only has reset vectors in the last bank, and that particular MMC1B2 board isn't booting into that bank. I have an MMC1B2 board that does just that. If I sit there and power cycle the system enough times, the game will eventually start (it's a ROM I mad...

I have an SNES clone also, it was given to me about 20 years ago. One of the chips is marked VS250, and the others are blank. It's a "Gamestation", said to be made by Xinga (from what I've heard, as there's no identifying info on it anywhere). Instead of a cart port, it has a Game Doctor SF7 plugged...

And how many writes can unrom-512 and gtrom flash tolerate? The worst modern flash is only 100 writes, you'd kill it in half an hour of minecrafting. For SST39SF it's 100K per sector, 4kB in size, so there are 128 in total. I've noticed older versions of the datasheet say 1 million, but from what I...

For a (long!) while I've been thinking about how FlashROM would be perfect for a large, editable, persistent world. There are some technical challenges though, the boards that are self-flashable I think typically don't include WRAM. UNROM-512 and GTROM are a couple low-cost boards with 512kB flash. ...

Namco was one licensed developer who practically feuded with Nintendo over this. They had a deal with Nintendo early on, apparently Yamauichi felt the deal was too much in Namco's favor and refused to renew that agreement. This led to Namco publicly criticizing Nintendo as a monopoly, promoting othe...

You could also look at the power switch. If you're going to have your other NES apart, you could test the other switch assembly, easy since it is connectorized. I've had to clean the switches before, it was frequently causing the NES to crash. The switch itself could be disassembled if you really wa...

Would something like this make any sense? They are all pointing to the same location from the CPU to pick from... I'm assuming this for CHR-ROM, and not CHR-RAM (the answer would be totally different). It seems unnecessary, but NESASM has some quirks around the way it handles banking (it silently d...

GTROM is also available, those are currently $9.50 each. Same price for low-volume orders. It's a simple mapper, but having 512kB makes it a decent step up from NROM and UNROM.
https://wiki.nesdev.com/w/index.php/GTROM

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This forum tends to attract fake SEO and spam accounts, and is quite vigilant against it. I don't know why they even bother trying.

Because of that, you'll need to post something related to the main topic of this forum. Otherwise, your account may be deleted. (FYI if this is a legit account)

The EOR constants in the checksum are familiar to me, it's the polynomial used in XMODEM CRC16. Googling "0x1021" will turn up some info on that. I knww this constant reminded me of something ! Thanks Memblers ! The problem is : Why use CRC16 but check only 8-bits ? They'd have to either use CRC-8 ...

The EOR constants in the checksum are familiar to me, it's the polynomial used in XMODEM CRC16. Googling "0x1021" will turn up some info on that. Being 8-bits it already has a 1/256 chance of being false positive, if the sanity checking is only on herbs and torches, that's barely 2 bits. I would gue...

First post is a copy/paste of a previous thread.
viewtopic.php?t=15340

Provided the CPU time is available, vertical stretching is possible by changing the complete (horizontal and vertical) scroll position during vblank with the $2006-$2005-$2005-$2006 write sequence. Any links? :wink: To be clear there was was a typo, tepples meant hblank rather than vblank. vblank u...