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Messages - MP2E

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EverDrive N8 / Re: Mapper 163
« on: September 13, 2014, 03:55 PM »
I doubt it, the only listed games for this are the chinese pirates of Pokemon Yellow and Final Fantasy VII, which are both 2MB in size and therefore too large. The PCB in each of these games has 2 chips, a 1MB CHR ROM chip and a 1MB PRG ROM chip. The Everdrive N8 only has a 512kb CHR SRAM chip and 512kb PRG SRAM chip. So even if the mapper was supported we'd never be able to test it because the games will not fit.

I feel like I just had this conversation before.. Is this FastFourierTransform again?

It's simply not possible unless you solder your own SRAM chips on and reprogram the OS, or wait for another Everdrive.. But that may be quite some time.

I've also heard on nesdev that these Chinese carts have a bunch of garbage data and an inefficient text rendering system that wastes ROM space. Perhaps disassembling the game and fixing the text renderer, while porting to a better mapper could slim the game down to 1MB? It's difficult, but it's the only way the current Everdrive n8 will ever be able to run these games.

EverDrive N8 / Re: Everdrive n8 rom support
« on: September 13, 2014, 12:33 AM »
Edit: I accidentally purchased a fake everdrive. It said that the game was totally compatible, but of course it didn't work. I wanted someone to verify that it worked for sure, and not count up kilobytes. I don't know how the nes or the everdrive works, so If you want to be helpful, please try it for yourself and post the results.
The answer was already posted in another thread, stop spamming. Your ROM will not work, and if you don't know about kilobytes and megabytes then I don't know what to tell you. That's computers 101.

EverDrive N8 / Re: Akumajō Densetsu's audio is a bit off
« on: September 12, 2014, 05:55 AM »
I discovered a test that will help us test for correct VRC6 behaviour:
Nesdev VRC6 test

Also, holding A and B while pressing start on the menu of Akumajō Densetsu will access the sound test mode for easier testing of music. B plays music from there.
Songs with differences compared to the original so far that I've found:
Prelude - First notes are held too long. Bass notes are very low in volume compared to original
Beginning - Some notes held too long, related to Prelude? Mostly sounds good
Clockwork - Same thing, mostly sounds good
Anxiety - Few notes held for too long in the beginning
Stream - Lower notes need to be slightly louder

Please post if you notice anything else!

EverDrive N8 / Re: Super Off Road residual notes issue
« on: September 11, 2014, 09:51 AM »
That's totally normal for that game, I own the real cart and it does the exact same thing.
Thanks for the info!

EverDrive N8 / [SOLVED] Super Off Road residual notes issue
« on: September 11, 2014, 07:59 AM »
EDIT : nevermind! Turns out the real game does the same thing :P

EverDrive N8 / Re: Akumajō Densetsu's audio is a bit off
« on: September 11, 2014, 02:09 AM »
Yeah true, especially in the beginning intro. The rest is almost ok...strange
I noticed a few notes held too long in stage 3 as well(or stage 2 if you go down on level select) but it seems like its the same instrument used as the intro so fixing the intro should fix that too. Other than that, everything sounds great!

EDIT: First level music as well as the ghost ship level have some
notes that are held too long as well. Probably related to the intro screen issue

EDIT2: Trying with audio mix set to low completely messes up all of the music.
Perhaps original cart contains a supplementary audio chip?
It does, the VRC6 mapper used has additional sound channels. But the Everdrive N8 supports the VRC6, there are just some slight inaccuracies I noticed, thus the thread.

EverDrive N8 / Re: Sunsoft 5B Question
« on: September 09, 2014, 11:15 AM »

It would be great if Save States could be supported too for speedrunning purposes.  Any idea if that is a possibility?
The FPGA in the Everdrive N8 should be strong enough to simulate every mapper there has ever been for NES with save state support. *Actually doing so* is another story, from reading around, krikzz has to simulate every mapper twice in Verilog, once to get the game to work without savestates, and once with savestates. It's quite a lot of work. The only thing for it is either patience, or reading up on technical details about the Sunsoft 5B and learning Verilog in an attempt to simulate it yourself!

Thankfully, Sunsoft 5B is well documented and is a superset of FME-7, which is already implemented, plus a variant of the AY-3-8910. Nestopia has implemented the Sunsoft 5B as well, or at least the parts that Gimmick! uses. I've researched into this area a bit myself, with the hopes that one day I might be able to contribute a mapper or two, but that's a long way off :) I know a bit about programming software, but not so much hardware...

For now, if anyone wants an inexpensive alternative to buying Gimmick! (JPN) with expansion sound, you can purchase a full NES cartridge PCB populated with a new Sunsoft 5B MMC and CHR/PRG ROM chips, plus programmer for ~47$. I haven't purchased it myself, but it looks legitimate.

Sorry for the thread derail! Just wanted to share some information I've accumulated about this gem.

EverDrive N8 / Akumajō Densetsu's audio is a bit off
« on: September 08, 2014, 02:46 PM »
Hi there! Recently got an Everdrive N8, and I'm quite happy with it. I did notice the VRC6 sound output is a bit off in Akumajō Densetsu, though. The volume is too low for some things, too high for other things, and some notes are held for too long. I realize this is pretty vague, but the introduction song shows the issues off best. The first few notes bleed into each other because they are held for too long on the Everdrive N8, they are cleanly cut on the VRC6. The bass-y parts seem to be lacking as well, compared to the real VRC6.
VRC6 on Everdrive OS v11.1
Real VRC6 playing in Famicom

I'm not the only one who noticed, someone at sega-16 pointed it out, too. They actually pointed out a few more things that are different, as well..

Just wanted to point this out to you, thanks for all of the hard work :)

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