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Re: 4-op examples of synthesizer music

Posted on 2023-06-20, 08:03

Windows 3.x isn't a game but MIDI drivers for the OPL3 are available, with the capability of using the 4-op mode. Do you mean "extended" versions of these tracks? First 4 extended versions have 104h set to 0. Cybersphere "04 Level BGM 1.vgz" uses 4-op mode in first channel in high bank (104h = 0x08 …

Re: DRO OPL3 registers dump bug

Posted on 2023-06-19, 07:12

What about changing the format of OPL3 dump to VGM / VGZ? This format looks to be widely supported (by applications and online players). VGM also is a raw OPL3 format and is a simple format. Why DOSBox must use 1594th format/standard? Using a supported format should make debugging easier.

Re: 4-op examples of synthesizer music

Posted on 2023-06-19, 06:40

I found archive with music ripped from games which uses YMF262 (OPL3) chip. I know how to decode this format (VGZ and VGM) and after decoding it to DRO 0.1 or RAW I can play it in DOSBox (with use of DROPlay, RDOSPlay etc.). I also handle this format in my player for linux and I can test my …

Re: 4-op examples of synthesizer music

Posted on 2023-06-18, 15:15

Those with the A2M and A2T extensions are capable of using OPL3's 4-op mode and several of them are found in the MODULES folder. Note that I don't know which of those files exactly use it. :/ Thanks for answer but... how to record OPL3 commands if Ctrl+Alt+F7 mode in last version of DOSBOX is …

DRO OPL3 registers dump bug

Posted on 2023-06-18, 08:47

Please restore format 0.1 from DOSBOX version 0.72. The new algorithm has many bugs: 1) The DRO 2.0 format doesn't save A6, A7, A8 and B6, B7 and B8 registers if the file contains writing of BD register. The file contains malformed information about percussion instruments. 2) lack of 104h register …

Re: 4-op examples of synthesizer music

Posted on 2023-06-18, 08:03

Gmlb256 , I created DRO file with DOSBOX 0-74.3. The file doesn't contain any write command 04 and the file sound different after playing it. DosBox probably still sucks. Previously dosbox didn't dump B6-B8 registers in BD mode. So many years have passed and the basic functions of DosBox only work …

4-op examples of synthesizer music

Posted on 2023-06-17, 17:38

I need examples of synthesizer music for OPL3 to test my OPL3 emulation. I have wrritten also OPL3 emulator to fully support old formats of music. I support DRO 2.0, DRO 0.1, DRO N.1 and RAW formats regarding 4-op OPL3 mode. What games use the 4-op mode? I tested: altair.dro, aquarius.dro, triumph. …

Version N.1 of DRO format

Posted on 2023-06-12, 08:00

In the past (before version 0.72) the DRO had header with low part of version equal 1 and high version greater than zero. Here is a file with this version number. I have implemented in my player versions 0.1, 2.0 and this one but I have one problem. The samurai.dro (after addition setting of …

HSC special values

Posted on 2023-06-12, 06:58

I have written new HSC Player (GARGAN-2A) with corrected bugs of HSC15ECR but part of rare commands are not implemented due to lack of documentation. The 0x01 special value means change track to next. 0x05 is «enable percussion mode» and 0x06 is «disable percuession mode». The non-handled special …

INT 8 (IRQ 0) - what is correct frequency?

Posted on 2022-06-01, 11:47

This interrupt is named ninetenth seconds interrupt (1/18 s). Part of sources states the interval is 55 ms. Part of sources states the interval is 65536/1193180 s = 54.925493 ms and part states the interval is 65536/1193184 s = 54.925309 ms. Where is the truth?... I need correct frequency to …

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