Search found 3776 matches

by Memblers
Mon Jun 01, 2020 2:55 am
Forum: NES Hardware and Flash Equipment
Topic: Why when unable to load a game, the NES loads solid screens of color, while other consoles don't?
Replies: 2
Views: 62

Re: Why when unable to load a game, the NES loads solid screens of color, while other consoles don't?

I also seem to have a lot more trouble getting NES games to load, even with a brand new 72-pin connector and a clean cart edge. My SNES and Genesis never seem to have that problem. I'm using the toaster NES, is the top loader better at loading games? Is that 72-pin connector just that flaky? Yeah, ...
by Memblers
Mon May 25, 2020 2:58 am
Forum: NES Hardware and Flash Equipment
Topic: Connecting NES to Teddy Ruxpin
Replies: 25
Views: 683

Re: Connecting NES to Teddy Ruxpin

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...
by Memblers
Wed May 20, 2020 5:46 pm
Forum: NESdev
Topic: Mmc1a versus 1b2 etc
Replies: 12
Views: 527

Re: Mmc1a versus 1b2 etc

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...
by Memblers
Mon May 18, 2020 7:46 am
Forum: SNESdev
Topic: SNES Clone
Replies: 9
Views: 642

Re: SNES Clone

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...
by Memblers
Sun May 17, 2020 4:23 am
Forum: Homebrew Projects
Topic: Minecraft Clone on the NES
Replies: 15
Views: 1024

Re: Minecraft Clone on the NES

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...
by Memblers
Sat May 16, 2020 10:51 am
Forum: Homebrew Projects
Topic: Minecraft Clone on the NES
Replies: 15
Views: 1024

Re: Minecraft Clone on the NES

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. ...
by Memblers
Wed May 13, 2020 5:11 pm
Forum: General Stuff
Topic: Has anyone tried to obtain an "Official Seal" from Nintendo for their game?
Replies: 38
Views: 3485

Re: Has anyone tried to obtain an "Official Seal" from Nintendo for their game?

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...
by Memblers
Sat May 09, 2020 5:23 pm
Forum: NESdev
Topic: A new hardware problem for me.
Replies: 9
Views: 760

Re: A new hardware problem for me.

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...
by Memblers
Sat May 09, 2020 4:12 pm
Forum: Newbie Help Center
Topic: Looking for a layman's explanation of WRAM
Replies: 7
Views: 635

Re: Looking for a layman's explanation of WRAM

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...
by Memblers
Thu May 07, 2020 6:02 pm
Forum: Reproduction
Topic: What reproduction carts are available?
Replies: 5
Views: 1122

Re: What reproduction carts are available?

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
by Memblers
Sat May 02, 2020 9:30 pm
Forum: General Stuff
Topic: Other than gaming
Replies: 1
Views: 747

Re: Other than gaming

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)
by Memblers
Mon Apr 27, 2020 7:48 pm
Forum: General Stuff
Topic: Dragon Quest (J) passwords reverse-engineering
Replies: 14
Views: 1115

Re: Dragon Quest (J) passwords reverse-engineering

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 ...
by Memblers
Sun Apr 26, 2020 5:08 pm
Forum: General Stuff
Topic: Dragon Quest (J) passwords reverse-engineering
Replies: 14
Views: 1115

Re: Dragon Quest (J) passwords reverse-engineering

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...
by Memblers
Thu Apr 16, 2020 10:26 am
Forum: NES Graphics
Topic: List of techniques to fake 3D graphics with 2D hardware?
Replies: 8
Views: 760

Re: List of techniques to fake 3D graphics with 2D hardware?

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