Everdrive N8 - VRC7 Mapper with FM Sound (now full YM2413!)
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Everdrive N8 - VRC7 Mapper with FM Sound (now full YM2413!)
Hello guys,
I just finished a new release of my VRC7 mapper implementation for the Everdrive N8.
After some long hiatus, I finally managed to get the VRC7 /FM sound core running reasonably well!
I have uploaded the release to the following location:
http://s000.tinyupload.com/?file_id=143 ... 2133932052
Enjoy, and happy hacking (since the core can of course be used with homebrew roms aswell)!
PS.: (in case you wonder) For this release, I'm using my name handle from the Everdrive support forum (Necronomfive).
I just finished a new release of my VRC7 mapper implementation for the Everdrive N8.
After some long hiatus, I finally managed to get the VRC7 /FM sound core running reasonably well!
I have uploaded the release to the following location:
http://s000.tinyupload.com/?file_id=143 ... 2133932052
Enjoy, and happy hacking (since the core can of course be used with homebrew roms aswell)!
PS.: (in case you wonder) For this release, I'm using my name handle from the Everdrive support forum (Necronomfive).
Last edited by 6502freak on Sun Aug 06, 2017 2:40 pm, edited 2 times in total.
Re: Everdrive N8 - VRC7 Mapper with FM Sound
Nice to hear this. Do you want to ask krikzz for add it to official mappers package?
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Re: Everdrive N8 - VRC7 Mapper with FM Sound
Video from an AV Famicom : https://www.youtube.com/watch?v=X3tUocZ ... e=youtu.be
Do you know if the real cart is as quiet when it comes to the expansion audio vs the internal audio? On an original Famicom, the mapper's expansion audio from the EverDrive is very quiet in relation to the internal audio.
Do you know if the real cart is as quiet when it comes to the expansion audio vs the internal audio? On an original Famicom, the mapper's expansion audio from the EverDrive is very quiet in relation to the internal audio.
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Re: Everdrive N8 - VRC7 Mapper with FM Sound
This is cool!
viewtopic.php?t=8639
The VRC7 board attenuates the 2A03 audio quite a bit. In that video it's balanced way too loud relatively, though probably you're going to have trouble getting loud enough output from the Everdrive to do it right. There's some reference recordings here:Great Hierophant wrote:Do you know if the real cart is as quiet when it comes to the expansion audio vs the internal audio? On an original Famicom, the mapper's expansion audio from the EverDrive is very quiet in relation to the internal audio.
viewtopic.php?t=8639
Re: Everdrive N8 - VRC7 Mapper with FM Sound
Hi,
The problem is that I can only adjust the volume in the digital domain, and in this regard, I'm already utilizing the full 13-bit range of my Delta-Sigma converter.
Meaning, if it needs to be louder, I have to scale the volume beyond the range of my converter, which means clipping the output when too many channels are played. I'm honestly not so fond of this idea.
Maybe I can find some trick by playing with the I/O drive strength and using a combination of push-pulling and tristating the audio pin.
yeah, I know.rainwarrior wrote: The VRC7 board attenuates the 2A03 audio quite a bit. In that video it's balanced way too loud relatively, though probably you're going to have trouble getting loud enough output from the Everdrive to do it right. There's some reference recordings here:
viewtopic.php?t=8639
The problem is that I can only adjust the volume in the digital domain, and in this regard, I'm already utilizing the full 13-bit range of my Delta-Sigma converter.
Meaning, if it needs to be louder, I have to scale the volume beyond the range of my converter, which means clipping the output when too many channels are played. I'm honestly not so fond of this idea.
Maybe I can find some trick by playing with the I/O drive strength and using a combination of push-pulling and tristating the audio pin.
- rainwarrior
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Re: Everdrive N8 - VRC7 Mapper with FM Sound
Yeah, part of the problem is the VRC7 itself has a HUGE dynamic range from its logarithmic volume function.
Even just clamping the max channel volume at ~11 might claim back a bit of headroom that Lagrange Point isn't using much.
I have not yet done testing on this (VRC7 is the last big reverse-engineering challenge in my plans for NSFPlay, still pending) but I've had reports that if you play it too loud it does end up distorting.6502freak wrote:I have to scale the volume beyond the range of my converter, which means clipping the output when too many channels are played. I'm honestly not so fond of this idea.
Even just clamping the max channel volume at ~11 might claim back a bit of headroom that Lagrange Point isn't using much.
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Re: Everdrive N8 - VRC7 Mapper with FM Sound
This isn't the first complaint I have heard of the EverDrive N8's quiet audio. Perhaps an amplifier mod, similar to the one used for earlier versions of the SD2SNES, would alleviate quiet expansion audio issues.
Re: Everdrive N8 - VRC7 Mapper with FM Sound
Very Well.
BTW, Is it possible to simulate VRC7 FC Sound with a altera or xilinx cpld?
BTW, Is it possible to simulate VRC7 FC Sound with a altera or xilinx cpld?
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Re: Everdrive N8 - VRC7 Mapper with FM Sound
The EverDrive N8 uses an Altera Cyclone II FPGA, but FPGAs are much more capable devices than CPLDs.byemu wrote:Very Well.
BTW, Is it possible to simulate VRC7 FC Sound with a altera or xilinx cpld?
Re: Everdrive N8 - VRC7 Mapper with FM Sound
Can you even fit something as simple as a sn76489 in one of the affordable CPLDs?
Re: Everdrive N8 - VRC7 Mapper with FM Sound
Old-school Xilinx CPLDs are sized in macrocells. Each macrocell corresponds roughly to one bit of state or one multiplexed output pin. Resources in a Lattice CPLD aren't quite so simple to estimate from the size of state, but here goes nothing.
A pulse channel starts at about 25 bits:
Period reload value (10 bits)
Period down counter (10 bits)
50% duty generator (1 bit)
Volume (4 bits)
A noise channel starts at 28 bits:
Noise period prescale (3 bits)
Noise period reload value (2 bits)
Noise period down counter (3 bits)
Noise LFSR generator (15 bits)
Noise waveform select (1 bit)
Volume (4 bits)
And some shared bookkeeping overhead:
Shared prescaler (8 bits)
Pulse density modulation adder (4 bits) - one channel is added every cycle, and this adder's carry is the output
A pulse channel starts at about 25 bits:
Period reload value (10 bits)
Period down counter (10 bits)
50% duty generator (1 bit)
Volume (4 bits)
A noise channel starts at 28 bits:
Noise period prescale (3 bits)
Noise period reload value (2 bits)
Noise period down counter (3 bits)
Noise LFSR generator (15 bits)
Noise waveform select (1 bit)
Volume (4 bits)
And some shared bookkeeping overhead:
Shared prescaler (8 bits)
Pulse density modulation adder (4 bits) - one channel is added every cycle, and this adder's carry is the output
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Re: Everdrive N8 - VRC7 Mapper with FM Sound
An Altera Max II EMP240 has 240 Logic Elements and will run you $7.50 on Mouser for the lowest-end chip in the family. Using Tepples' example, which has 115 bits, you should be able to fit everything onto the cheapest chip. This is using Altera's estimate of 240LEs = 128-240 MCs, avg. 192MCs. Could you fit the slightly more advanced capabilities of an AY-3-891x sound core?
Re: Everdrive N8 - VRC7 Mapper with FM Sound
Why that particular part? It seems comparatively expensive and yet is still only 3V...Great Hierophant wrote:An Altera Max II EMP240 has 240 Logic Elements and will run you $7.50 on Mouser for the lowest-end chip in the family
Re: Everdrive N8 - VRC7 Mapper with FM Sound
Hello,
I stumbled on this while setting up an Everdrive N8.
Just wondering what would happen if you threw a guitar compression pedal into the audio chain.
Thanks for the development.
I stumbled on this while setting up an Everdrive N8.
Just wondering what would happen if you threw a guitar compression pedal into the audio chain.
Thanks for the development.
Re: Everdrive N8 - VRC7 Mapper with FM Sound
My core is currently using 2910 LEs, which is beyond the capacity of any known "real" CPLD. Especially if you target the "desirable" 5V tolerant ones.Great Hierophant wrote:The EverDrive N8 uses an Altera Cyclone II FPGA, but FPGAs are much more capable devices than CPLDs.byemu wrote:Very Well.
BTW, Is it possible to simulate VRC7 FC Sound with a altera or xilinx cpld?
Btw, (in case you wonder) the reason why I am not posting at the Everdrive forum aswell is the failure to get my account reactivated (sent numerous password reset requests, but no response). If somebody would kick the admin, I might actually be able to answer to any kind of bug reports...
In addition of course to nesdev here.
Thanks so far for the positive responses!