Test VRC7 audio (incl. custom instrument)

I have written a program for the VRC7 audio: http://zzo38computer.org/nes_program/vrc7test.zip It includes source and binary for running in NES/Famicom emulator, or on a real VRC7 hardware if you have it. This program is public domain.

[I posted message in another section of the forum but you can remove that one; it doesn't work so well as this updated one]

Sorry for the five year bump, but a friend was asking about whether someone could make a VRC7 instrument tester, like the one CopyNES has but as a native ROM, so they could use it to try and refine the existing patch set.

I tried this ROM but I can't seem to get it to work. Every emulator I try seems to do something different, but none of them seem to have a working "cursor". Nintendulator has a black screen. FCEUX is unresponsive. Nestopia makes a high pitched whine and is otherwise unresponsive. puNES has the picture scrolled wrong unless you are holding a button...

What emulator did this originally work on?


This was the original version referred to, by the way: http://forums.nesdev.com/viewtopic.php?f=22&t=9093#p96785

I've found it to work with VirtuaNES 0.97. And also Nester 0.51b (with not-so-great sound quality).

Unfortunately I did not know so well how to write it at the time, so I did not to do a good job, sorry. It fails to clear the RAM and fails to do other important stuff too

Thanks for this. Helped me debug my issues with porting an FPGA implementation of the YM2413 into MiSTer.
I did have to fix one issue with the code:

needs to be after this line:

This code should not fall through to the npu: section.

I modified it slightly differently, but that should be the same effect as what I did (modified by hand in a hex editor the nes file as I don't have a compiler set up on my computer).

There are issues with initialization of values (push up or down on each number to update them at least once), and I think a palette isn't being set? The initialization could be fixed by setting the 25 bytes at valmem to 0 at start.
But in spite of this, it works and it helped.

Edit: Also, does anyone know the default/reset value of the audio silence bit (0xe000-bit 6)? The test rom doesn't set this.

Thanks again.