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Re: SBVGM (DOS) VGM Player

Posted on 2020-06-10, 23:38

I just spent some time thinking about the final result of the detection sequence. The value of 06h should be correct for the OPL2, so I think it may not be necessary to change SBVGM's detection routine. When I have time, I'll do some tests with the OPL2 Audio Board and see what values the OPL2 …

Re: SBVGM (DOS) VGM Player

Posted on 2020-06-10, 21:50

Thank you for all your suggestions; it's clearer now what is going on. It is tempting to try that method, but I'm not sure if that will have the same behavior on later generations of the x86 architecture (especially the Pentium line), but it's something that I will try to keep in mind. Software DOS …

Re: SBVGM (DOS) VGM Player

Posted on 2020-06-10, 15:09

1 means OPL2 detected, 3 means OPL3 detected, and the value in parenthesis is the result returned from reading port 388h after the detection sequence is finished. IMG_20200610_223321.jpg well, it's becoming more and more confusing... I think I see what the problem is now. SBVGM uses method 2 which …

Re: SBVGM (DOS) VGM Player

Posted on 2020-06-10, 14:18

For the OPL2, the result sequence should be: 06, C6, and 06. For the OPL3, the result sequence should be: 00, C0, and 00. I got 06,C6,06 but OPL3 is "detected".IMG_20200610_213456.jpgIMG_20200610_213505.jpg Thank you for the information. This is very strange. Do you mind running OPLCHECK (it's hard …

Re: SBVGM (DOS) VGM Player

Posted on 2020-06-10, 12:53

In what kind of computer? If the computer has no pull-up resistors on the ISA bus, the documented "port 388 returns 06" check will not work correctly. although i didn't build any pull up res to the data bus, it shouldn't cause the problem. i tried to use debug.exe to figure out what's wrong, and …

Re: SBVGM (DOS) VGM Player

Posted on 2020-06-05, 12:59

https://www.flickr.com/photos/94839221@N05/37749408916/in/album-72157687526598300/ Aaaah ! I remember now; we were talking about this last year. The VGMs in that the screenshot you kindly provided support the SN76489 chip which is 3 square wave and one noise channel. SBVGM will playback SN76489 …

Re: SBVGM (DOS) VGM Player

Posted on 2020-06-04, 21:36

recently i'm working on integrating both 2xSN76489AN, AdLib, SAAYM and a YMF262 (the base io address of both of them can be programmed by software to anywhere maybe from 0x0000 to 0xFFFF) onto my board. and can you tell me how the program check whether YMF262 exists so i can make it compatible. …

Re: SBVGM (DOS) VGM Player

Posted on 2020-05-19, 00:46

I have considered adding in PCM support, but that would mean that PCM support would only exist on 386 (and higher) class machines because of the amount of memory the extra sample data may require and CPU time that would be needed to decode the SegaPCM format (I think it's ADPCM based) and also mix …

Re: SBVGM (DOS) VGM Player

Posted on 2020-05-18, 10:56

Thanks for your answer, i'm glad to hear that's not impossible. You're welcome! I did forget to mention that the current version (v1.30) is capable of playing back Sega MegaDrive VGMs. While there are some similarities, some VGMs won't sound 100% the same because the YM2151 lacks a DAC, has …

Re: SBVGM (DOS) VGM Player

Posted on 2020-05-17, 21:26

Hi, Just received my TexElec SAAYM and did some testing with YM2151 tunes in my old 386. It's working great ! Is there anyway, maybe in future, to combine the SAAYM with a simple SoundBlaster in order to play both YM2151 and PCM parts (many YM2151 tunes uses SegaPCM/OKIM6295 for the PCM parts) ? …

Re: SBVGM (DOS) VGM Player

Posted on 2020-05-15, 13:05

Dual SN76489 is supported on Game Blaster or the TexElec SAAYM though. well, i gathered some information about SAAYM. i found it's two SAA1099 on SAAYM instead of two sn76489 and i didn't find any information about Game Blaster. so, which sound card support dual sn76489 and do you have any resource …

Re: SBVGM (DOS) VGM Player

Posted on 2020-04-13, 14:32

i tried slow irq0 version and found speed problem did improved, i recorded a video and analysed it and found it is playing faster and in some section which is obviously slower than normal speed now is pretty closed to the normal speed. and another important clue is that both v1.30, v1.30s and v1.30 …

Re: SBVGM (DOS) VGM Player

Posted on 2020-04-13, 11:53

It would be easy to support more frequencys on TNDY Soundcard and also another SN76489.. So the SN76489 is simply connected to input of each other ? no Stereo ? I'm not sure what his hardware set up is, but some dual SN76489 VGMs have a "stereo" configuration while others use the extra chip to add …

Re: SBVGM (DOS) VGM Player

Posted on 2020-04-13, 11:49

the machine is basically IBM-PC compatible and the CPU is 8086 running at 4.77MHz with 16bits width data bus directly running to the SRAM. so i think why it slows down is just that the CPU is full loaded. because if it were the system clock that cause the slowly playing, the frequency of every tone …

Re: SBVGM (DOS) VGM Player

Posted on 2020-04-13, 09:31

well, i tried v1.29, it's working well. and i even tried to rebuild BIOS and reinstall ms-dos6.22, v1.30 is still not working. the file witch causes the problem is https://vgmrips.net/packs/pack/super-locomotive-arcade#02-rydeen-main-bgm Thank you for trying out v1.29. Is there a way to get an …

Re: SBVGM (DOS) VGM Player

Posted on 2020-04-13, 09:24

Since I don't have a PCJr to test on, is it possible to get some kind of audio recording of the problem that you are having? I'm having trouble understanding what you mean by "skipped some segments while playing". Do you mind also trying out SBVGM v1.29 (attached to this message) and see if you …

Re: SBVGM (DOS) VGM Player

Posted on 2020-04-12, 13:37

Since I don't have a PCJr to test on, is it possible to get some kind of audio recording of the problem that you are having? I'm having trouble understanding what you mean by "skipped some segments while playing". Do you mind also trying out SBVGM v1.29 (attached to this message) and see if you …

Re: SBVGM (DOS) VGM Player

Posted on 2020-04-12, 13:31

I think I can look if vgmtool can be used in batch process and convert my vgm collection because it is so better to listen to them music without the bell bug, since I now noticed it. But if you add a fix for it I wont convert files. It might be a while before I have a chance to add this. For the …

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