OPNA for MSX - Anyone working on one to market & interest?

Expert (89)

01-06-2018, 12:00

I meant specifically OPN’s extended CH3. Emulating OPNA with full extended CH3 would need 9 FM channels. 1, 2, 4, 5, 6 as 4op, but CH3 could be 4op (6 channels needed) 2x2op (7 channels needed), 2op + 2x sine (8 channels needed), or 4x sine (9 channels needed, too many). For OPN, you’d only need 6 max.

As for the OPNB-B, only one Taito arcade board used them, so unless they can get a source for those that isn’t just fakes or remarked OPNA/Bs (not many on ebay, and all are remarks with date codes of 9124/25 or 1713) then they’re gonna have a hard time, and the carts will be super expensive. I also still don’t see the logic in not just using YM2203 or going all out with OPNAs instead of making their lives so complicated with a chip that is basically useless (there are ZERO 2610/2610B tools) needing an additional FPGA to get OPNA features. It’s safe to say I won’t be buying one of them. If this cart is the only hope for OPNA, I’m very disappointed.

بواسطة Grauw

Ascended (10820)

01-06-2018, 13:18

Ah CH3, gotcha, no that’s not emulated. Not used too often though.

About OPNB-B, not sure how many fakes are there, I got a couple from the same source I got my OPNAs, and at least all the OPNAs are legit despite looking a bit sketchy (filing marks on the surface)...

بواسطة sdsnatcher73

Enlighted (4291)

01-06-2018, 13:18

Grauw wrote:

VGMPlay does play all 6 OPNA channels on SFG, but there’s no samples support of course.

I tried playing VGM files from Snatcher on PC8801/YM2608 (which is OPNA, right?) on a CX7 with SFG-05 but vgmplay-msx will not output anything. Is this supposed to work? I sort of got that from your post here...

بواسطة Grauw

Ascended (10820)

01-06-2018, 13:19

@sdsnatcher73: You need to make a development build, I haven’t done a release since I implemented that. YU-NO also works decently, it doesn’t use the ADPCM, a few drums are missing but a lot of the drums are done through FM so it’s not too noticeable.

بواسطة Pencioner

Scribe (1609)

01-06-2018, 13:38

@sdsnatcher73 - i will send you the last development build by email at evening, if you want

بواسطة sdsnatcher73

Enlighted (4291)

01-06-2018, 15:48

Pencioner wrote:

@sdsnatcher73 - i will send you the last development build by email at evening, if you want

Always! Has this been added recently? I built from source max. 2 weeks ago... or is it not in master branch?

بواسطة Grauw

Ascended (10820)

01-06-2018, 16:22

It's been in there for several months already, on the main branch...

Are you sure you're on latest? Contrary to git, Mercurial pull doesn't automatically update... Issue hg update -B @ afterwards (or use hg pull -u).

بواسطة sdsnatcher73

Enlighted (4291)

01-06-2018, 18:21

I cloned the repo again, built from scratch on a linux machine and now it is playing. Sounds are just wonderful! Keep up the good work! Which one is YU-NO?? Google get's confused if I search for it What is the chip identifier (like YM2608 for OPNA)?

بواسطة Grauw

Ascended (10820)

01-06-2018, 18:37

I mean YU-NO. Great soundtrack. I like tracks 13, 21, 26, 32, 46 and 67 best.

بواسطة ren

Paragon (1947)

01-06-2018, 21:49

Hmm.. No 11. Movement & 77. Travel in your list?