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Re: SBVGM (DOS) VGM Player

Posted on 2017-02-09, 14:07

Simply awesome ! I dont think I would had found that by myself. I figure you are talking about this configuration global options: LOG_CPU: log CPU writes to file (0=off, 1=sound only, 2=all writes, 3=all r/w) LOG_CPU_FILE: filename of CPU write log It seem easy to try all three options, but on this …

Re: SBVGM (DOS) VGM Player

Posted on 2017-02-01, 08:24

Sorry I wasnt clear enought, no I was not able to play them. Maybe I could fiddle with the header and see what it give. After some tought I found myself a bit whiners to ask for that when I already have the SMS and NES version of Y's on your player and there is a midi rip of silpheed on the pc that …

Re: CMS/GameBlaster emulation thread

Posted on 2017-01-25, 11:33

in PC Emulation
Thanks, sure thing. Hmm, I think you can only get lower frequencies than the three presets when the noise is clocked by tone generator. Fixed rates for clocking the noisegen are X=27965 Hz, X/2, and X/4, while with a tone generator clocking it you can get up to about X/2 maximum as well. The trick …

Re: CMS/GameBlaster emulation thread

Posted on 2017-01-24, 14:08

in PC Emulation
Pretty interesting findings! If you have a chance, would you mind elaborating how the undocumented noise at higher frequencies is triggered? I'm only familiar with setting the noise generator control to 0x03 (for generator 0) at address 0x16 to drive the frequencies higher.

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-24, 03:16

I'm really only into those two soundtrack https://vgmrips.net/packs/pack/silpheed-nec-pc-8801 and https://vgmrips.net/packs/pack/ys-ancient-ys-vanished-omen-nec-pc-8801 maybe they work somehow with your player already ? they are old music, there could be another rip. I am absolutely amazed with the …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-19, 14:54

The YM3526 should be the same as well. I finally got around to doing some tests with the noise generator. Depending on how the channel frequencies are set, it can be made to make different (odd) sounds. Unfortunately the sound output doesn't behave like the noise generators of other chips. …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-15, 23:07

You're absolutely right! Thank you for pointing this out and the example file. On both the YM3526 and the YM3812 or YMF262 the tom-tom and cymbal channels use operators 14 and 17 respectively. I think the noise generator is used for the cymbal channel. Unfortunately as a side effect of converting …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-15, 13:00

I had a tought that I would like to share. It might came from the root of your player, it call for experimentation. Sometime your player refuse to play a file recorded for a supported player and dont give much information about why. Othertimes it say that the vgm is not supported by player! But my …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-14, 08:46

I wanted more music to listen with sbvgm, so at lunch today I started seeking your table on the SBVGM.TXT and seek vgmrips to see what music each chipset could offer. To help me I made a list and started to note each system I found using a chipset. I decide to finish it and post it here in the hope …

Re: CMS/GameBlaster emulation thread

Posted on 2017-01-09, 01:48

in PC Emulation
@Jepael: Here's the tool I wrote to play around with the SAA1099's registers (channels 0 through 2 only). You can use mouse and keyboard (space bar sets the values). DOSBox 0.74 has a bug with the mouse position in the 40x25 text mode so I would recommend using a different build. Hope this helps out …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-08, 10:43

I see you chat alot about coding asm and C, did you decided to release you source code? What do you use to compile it ? djgpp ? I'm eager to read your source code, I prefer to do that rather then read a book. I'm in my bed now under my curtain now, but I look forward to use your software tomorrow …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-08, 06:26

The present SAA1099 emulator used by DOSBox, VGMPlay (from VGMRips.net), and likely MAME doesn't support proper envelope generator emulation. It is kind of there, but I believe there is a bug in it's implementation (on how it gets activated). Once the envelope generator is enabled, the two ways to …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-06, 12:14

v1.11 is released here . @NewRisingSun: I took into consideration your suggestion about not working around the SAA1099 frequency bug in DOSBox 0.74 and went ahead and removed the functionality all together. Hopefully there will be a DOSBox update in the near future as I had pointed out that bug over …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-05, 15:00

Also, the first few notes of attached BRUCELEE.VGM are played incorrectly, even after taking the pitch shift into account. Since this is my own player and arrangement of the song (the original game only supports the TI chip and sounds like crap , high-pitched shrieking without any note envelopes), …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-04, 23:04

Gameblaster emulation is not usually so important if it appears to work. At least the pitch is now fixed in ScummVM. DosBox still assumes the SAA chips run at emulated 31250 Hz sampling rate, but in reality it's about 27965 Hz. So tone number 3 on octave 4 is closest to 440Hz A4 reference tone, …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-04, 23:03

Here is the 900K VGM file from that Creative demo. The TI file from Bruce Lee is not actually relevant to the SAA emulation (I was talking about the VGM of my SAA1099 recreation of the music), but I have attached the pack nonetheless. Thank you for the files! I'll go ahead see where the problems …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-04, 22:45

@OPLx: The pitch is too low when playing back SAA1099-writes containing VGM files. Apparently you are correcting for vanilla DOSBox getting the SAA1099 base clock wrong. That however makes it sound wrong on DOSBox builds that have this corrected, and has the additonal effect of playing .VGM files …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-04, 12:24

The safer way to manipulate the PCjr's (and early Tandy 1000's) Audio Multiplexer is Int1A AH=80 AL=Audio source (0=PC speaker, 1=Cassette, 2=I/O channel "Audio In", 3=SN76496). The reason that manipulating port 0x61 directly is bad is that on the Tandy 1000 TX and TL, which don't need the …

Re: SBVGM (DOS) VGM Player

Posted on 2017-01-04, 07:59

Now that I have fm1312 and saa1099 on that sb1.5, let's talk about the real stuff: first thing first : if I do "sbvgm -h music.vgm" it display help, but if I do "sbvgm music.vgm -h" it does not. BUT ! if I do "sbvgm -c music.vgm" it complains -c is not a file, but if I do "sbvgm music.vgm -c" it …

Re: SBVGM (DOS) VGM Player

Posted on 2016-12-26, 22:26

Most "register dump" formats like VGM, DRO, IMF and RAW only tell what data to write to which register without the delays needed to access hardware, the delays are only for things like tempo (like in a MOD player to play a row of tracked notes from a timer/vblank interrupt). So yes, you do need to …

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