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Re: SBVGM (DOS) VGM Player

Posted on 2020-07-10, 11:08

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: SBVGM (DOS) VGM Player

Posted on 2020-06-10, 15:59

The only thing I can think of is that the clock feeding the OPL2 isn’t running exactly at 3.579545 MHz or there is some kind of interference coming in from another source. this time i have already build a fourfold frequency divider to provide an enough accurate 3.57MHz clock to all these chips …

Re: SBVGM (DOS) VGM Player

Posted on 2020-06-10, 15:39

When we use DEBUG to write and read the values, it’s likely because our response time for entering the values is much slower we see the correct results; the CPU sending and reading the data is much faster. i think maybe it just because a byte following the in instruction in the DEBUG.EXE pulled the …

Re: SBVGM (DOS) VGM Player

Posted on 2020-06-10, 15:28

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, 14:37

OPLx wrote on 2020-06-10, 14:18: 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. Filename IMG_20200610_223321.jpg File size 1.29 MiB Views 1706 views well, it's becoming more and more …

Re: SBVGM (DOS) VGM Player

Posted on 2020-06-10, 13:39

OPLx wrote on 2020-06-10, 12:53: 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". Filename IMG_20200610_213456.jpg File size 897.45 KiB Views 1717 views Filename IMG_20200610_213505.jpg …

Re: SBVGM (DOS) VGM Player

Posted on 2020-06-10, 10:32

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 2020-06-10, 09:00

it's quite strange, the program says there's a YMF262 at 388. Filename IMG_20200610_165142.jpg File size 1.27 MiB Views 1419 views but actually it's a YM3812 Filename IMG_20200610_165133.jpg File size 314.75 KiB Views 1419 views i think something is wrong but it's playing correctly debug: -o388 4 - …

Re: SBVGM (DOS) VGM Player

Posted on 2020-06-04, 16:41

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 2020-05-18, 16:29

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 2020-05-15, 12:42

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, 15:12

Thank you for the feedback. Since the slow IRQ version updates at 60Hz, there is nothing in SBVGM that changes speed during playback; all that happens is data is sent to the sound chip based on the delays from the VGM data. I also took a look at the dump of the VGM data itself and I did not see …

Re: SBVGM (DOS) VGM Player

Posted on 2020-04-13, 13:54

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, 09:53

Thank you for trying out v1.29. Is there a way to get an audio recording (wav or mp3 file) of this problem? I have a TNDLPT that I test with and I don't seem to hear any differences between v1.29 and v1.30 so it's difficult for me to know what the "skipped some segments while playing" problem may …

Re: SBVGM (DOS) VGM Player

Posted on 2020-04-13, 05:13

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, 07:03

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 2020-04-11, 19:44

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 …

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