Improved-PPMCK

B00daW · Post by **B00daW** » Fri Jul 27, 2012 6:06 pm

Why the need for the Roman numerals on the VRC chips? Also, is there a NSF example of the DPCM hack?

rainwarrior · Post by **rainwarrior** » Fri Jul 27, 2012 11:30 pm

Thanks for the info, Dwedit. I'd been meaning to test that out, but hadn't gotten to it yet.

Dwedit · Post by **Dwedit** » Sat Jul 28, 2012 12:33 am

Never actually tested this out, it's still a guess. But I just implemented a silent (counter-only) DMC channel, so the strange features where it holds a byte and waits for it to drain are fresh on my mind.

Post by **tepples** » Sat Jul 28, 2012 7:29 am

B00daW wrote:Why the need for the Roman numerals on the VRC chips?

Presumably to match the marking on the chip itself.

Jarhmander · Post by **Jarhmander** » Sat Jul 28, 2012 8:59 am

rainwarrior wrote:~J-@D!~, on the subject of a loop point for DPCM samples, do you need to use an IRQ? Can you just rewrite $4012/4013 with the loop points immediately after starting playback?

I haven't tested this on hardware, but I would kind of expect that the hardware doesn't read the $4012/4013 register values except when starting playback or restarting the loop.

Or... were you saying that this does work, and you had replaced PPMCK's DPCM IRQ feature with it as a hack?

Last statement: exactly. IRQ mode with NSF is pretty useless, so I hacked it into my special looped version. I tested it on my powerpak and it works flawlessly.

I think blargg has verified that when setting the playback bit, the internal address and length registers are immediately reloaded.

cak · Post by **cak** » Sat Jul 28, 2012 1:48 pm

In regard to microtuning, I think extra flats/sharps would be more flexible than extra note letters.

zzo38 · Post by **zzo38** » Sat Jul 28, 2012 10:55 pm

cak wrote:In regard to microtuning, I think extra flats/sharps would be more flexible than extra note letters.

You still can use flats/sharps but simply - is down one and + is up one so if there are more spaces between the letters then you may need more than one sharps/flats to access some notes. However, due to the playback engine there is only up to sixteen notes in one octave regardless of what each letter corresponds to and what frequencies (or periods) are used for each note of an octave. (For example, c+-++-++-- is also a C sharp note same as c+ is, and if the scale you set has three extra unnamed notes between the "c" and "d" then you would need double flat/sharp like c++ or d-- to access the note in between.)

Jarhmander · Post by **Jarhmander** » Sun Jul 29, 2012 9:13 am

Very simple and quick demo, doesn't sound too good. The crappy "intro" shows more the special looped mode. You can also try a decent nsf player (nsfplay) ans slow it down. Works on the powerpak. https://dl.dropbox.com/u/5476016/mmltest.nsf

What the mml looks like: https://dl.dropbox.com/u/5476016/mmltest.mml. I abused the "Y" command.

Source provided, but don't expect support for the moment. https://dl.dropbox.com/u/5476016/mck9aex2_mod.7z

ionustron · Post by **ionustron** » Mon Jul 30, 2012 8:07 am

I have nothing to really contribute other than I'm happy these have been made, and whatever enhancement branch is finished should be called 3pmck

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Improved-PPMCK

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