VOGONS

Search

Common searches

Search results

Display options

Display options

Re: SBVGM (DOS) VGM Player

Posted on 2020-07-10, 13:53

I have gone futher on intergrating those sound cards to my motherboard and now I noticed something quite comfusing. Dual SN76489AN, SAA1099 and YM2151 can be assigned to left and right channel easily (by the way is ch1 goes to left and ch2 goes to right?); OPL2 and Digital Sound Processor of Sound …

Re: Need help with Philips SAA1099 sound chip.

Posted on 2020-07-04, 00:00

in Marvin \ Sound
I could never figure it out how, but I think Bit 5 can be used to supply a custom envelope shape to the generator. If I read the datasheet correctly, you cannot supply a custom envelope shape, but control how quickly the envelope generator advances through the envelope shape. You'd basically clock …

Re: SBVGM (DOS) VGM Player

Posted on 2020-07-02, 22:28

By vgmplay.exe, you mean SBVGM, right? It's not a bug per se as that is how the VGM data was captured. Some PSG chips (like the SN76489 and the NES' RP2A03) have the side effect of when a note was played at a particular high frequency, it wouldn't be audible to the human ear. As a consequence of …

Re: SBVGM (DOS) VGM Player

Posted on 2020-07-01, 09:36

jaZz_KCS: I could not find info about cms2lpt but I assume it's an saa1099 plugged on an printer interface. If your intend is to use it with vgmplay.exe to listen to sega master system sn76489 chip let me warn you about a bug, it's a sustained bell when some good games music try to cut a note. I'm …

Re: SBVGM (DOS) VGM Player

Posted on 2020-06-28, 21:15

Hi OPLx, do you think this kind of soundcard would work well with sbvgm ? If your player already work well on tandy I have high hopes it can be used on a clone pc. https://www.vogons.org/viewtopic.php?f=62&t=74946 If it works with other Tandy 1000 software (like those Sierra games), I don't see why …

Re: Need help with Philips SAA1099 sound chip.

Posted on 2020-06-22, 08:14

in Marvin \ Sound
Hi everyone! I'm coding a MS-Dos game that will support AdLib, Sound Blaster and CMS/Game Blaster (Philips SAA1099). I'm making some tests with the SAA1099 and I can produce lots of great sounds but I can't set the envelope duration properly. I have tried different values for frequency and octave …

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 …

Page 3 of 11

Go to top of page Go to top of page
Close window
Close window