Re: screamtracker adlib support?

Posted on 2007-06-24, 19:27

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by Srecko

in DOSBox Games/Apps

in DOSBox Games/Apps

If Scream tracker tries to play digitized sounds over Adlib, you might be out of luck. This requires very good timing resolution and isn't working too well in Dosbox. OTOH, it may be possible that is is just a sort of FM instrument as screen might imply, then it is strange that it doesn't work.

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Re: DosBox v0.70 MIDI handling for the rev00 MT-32 Roland synth

Posted on 2007-06-15, 14:01

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by Srecko

in DOSBox Development

in DOSBox Development

If you want to insert a delay, best option is (as Qbix mentioned) to set on MPU401 status bit to 1 and return the status byte on port 331 with this bit set. Bit 6 tells the application if mpu401 is ready to receive data on port 330. Of course, you will need to use dosbox timer to change the bit back …

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Re: 16-Bit VESA graphics?

Posted on 2007-05-03, 10:13

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by Srecko

in DOSBox Development

in DOSBox Development

Another potential speed problem is color conversion. Though it could be offloaded to GPU using fragment (shader) programs, as long as emulated framebuffer is (copied/DMA'd ) in(to) video RAM (think also about those demos with copper bars!). 486-class hardware didn't even have speed to do fullscreen …

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Re: DOSbox - two MIDI bugs

Posted on 2007-05-03, 09:52

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by Srecko

in DOSBox General

in DOSBox General

Yes, just copy over the old one (or rename it so you can have both).

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Re: DOSbox - two MIDI bugs

Posted on 2007-05-02, 21:15

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by Srecko

in DOSBox General

in DOSBox General

If your program is using intelligent mode, then from your description this seems like some kind of race condition bug with MPU-401. It is possible, but not guaranteed that it is corrected in newer build which I posted few months ago here on forums. (I'm not really doing this lately, as I'm not at …

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Re: DOSbox - two MIDI bugs

Posted on 2007-04-30, 10:38

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by Srecko

in DOSBox General

in DOSBox General

I'm here again :) If this works in UART mode (i.e. you set it to uart in config file)...than you don't have to even care about intelligent mode. Btw. for windows just use win32 "device". So, questions: Do your clock messages get lost, or you just don't receive them at exact time when they are …

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Re: DOSbox - two MIDI bugs

Posted on 2007-04-16, 16:34

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by Srecko

in DOSBox General

in DOSBox General

Hmm, are you using MPU401 intelligent mode or UART mode (as set in the dosbox.conf)? There was a thread in "General" section with updated build (MPU401/MIDI improvements + MIDI input), maybe it helps with your (first) problem, especially if your program uses intelligent mode. Regarding timing.... …

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Re: Developing games FOR dosbox?

Posted on 2007-04-01, 12:06

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by Srecko

in DOSBox Development

in DOSBox Development

Better choice IMO is SDL. It runs wherever dosbox runs (dosbox is built on top of it), so your game will probably be cross-platform. (except if you want native DOS port, then you should go with Allegro). If you have time to spend and want to practice before you go to write something linux kernel …

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Re: Fork DOSBox?

Posted on 2007-03-28, 10:27

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by Srecko

in DOSBox General

in DOSBox General

WGF 1.0 and even XP drivers shoud be more than enough to support 3D acceleration on host (they support very primitive multithreading and resource managing, but it's not a problem if you have only one 3D application running and/or disable the lovely 3D desktop). As far as I understand: work that …

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Re: 132 characters on a line

Posted on 2007-03-25, 15:02

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by Srecko

in DOSBox General

in DOSBox General

How did you set that character mode back then? it might be possible in dosbox as well. This, as far as I know, should be done using INT10 interfaces, and I'm not sure if that would actually would work in "vanilla" Dosbox. But in that case you might get better compatibility with Univbe.

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Re: using ISO's with "boot"?

Posted on 2007-03-24, 13:40

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by Srecko

in DOSBox General

in DOSBox General

El-torito isn't enough, It will require emulation of IDE/ATAPI port to support more than just booting DOS floppy image from cd (as it uses mscdex based drive to access rest of the files on the disk).

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Re: Bug in the MPU-401 Emulation

Posted on 2007-03-20, 15:24

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by Srecko

in DOSBox Development

in DOSBox Development

Throttling issue is not related to CPU speed of a real machine, but is related to dosbox cycles (because real MPU401 will set a status bit if it is not ready to receive more data so the problem doesn't exist). Did you also try with mpu401=uart? (if this setting works at all with Sierra games...) as …

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Re: Bug in the MPU-401 Emulation

Posted on 2007-03-19, 19:24

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by Srecko

in DOSBox Development

in DOSBox Development

Can you please test it with te build which I uploaded in this thread? http://www.vogons.org/viewtopic.php?t=14690 Could also be related to buffer overflow problem when games quickly sends lots of sysex data. Try to reduce CPU clocks (to a very low value, like 100,200 or 500) for game startup and …

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Re: does dosbox support MIDI IN yet?

Posted on 2007-03-13, 13:27

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by Srecko

in DOSBox General

in DOSBox General

I uploaded a patch to sf.net: http://sourceforge.net/tracker/index.php?func=detail&aid=1679781&group_id=52551&atid=467234 Here's a mingw binary that I compiled yesterday (use sdl dlls from dosbox installation). You can add "inconfig" parameter in dosbox.conf below the "config". It's used in the same …

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Re: does dosbox support MIDI IN yet?

Posted on 2007-03-08, 18:31

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by Srecko

in DOSBox General

in DOSBox General

Well, I'll try to get a build system (mingw probably) running during the weekend, so I can produce a build, then I'll probably upload (and/or at least patches to sf.net) it so you can begin beta testing...

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Re: does dosbox support MIDI IN yet?

Posted on 2007-03-07, 13:48

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by Srecko

in DOSBox General

in DOSBox General

Working on it for win32. It's functional except the intelligent mode which still hangs some old sequencers...Now the work is a stalled because I'm not at home until April (and then for a week only).

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Re: Dune 1 MIDI music and DosBox 0.70

Posted on 2007-03-04, 22:37

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by Srecko

in DOSBox Games/Apps

in DOSBox Games/Apps

I suggest to try if there are differences between sbpro(and lower) and sbpro2/sb16 setting. First use opl2 emulation, latter are opl3. (can be also enforced by opl mode setting). As some games rely on sensitive timing of OPL 2/3 commands and OPL emulation in dosbox has lower timing precision ( …

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Re: Dune 1 MIDI music and DosBox 0.70

Posted on 2007-03-04, 10:35

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by Srecko

in DOSBox Games/Apps

in DOSBox Games/Apps

Seems like a difference with SB16 FM (OPL3 music), not MIDI.

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Re: By the way

Posted on 2007-03-03, 15:59

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by Srecko

in DOSBox Games/Apps

in DOSBox Games/Apps

That's OK because nothing was changed in code after driver began working with sb16 setting.

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Re: Installing MSDOS on Dosbox - CDROM driver

Posted on 2007-03-02, 00:05

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by Srecko

in DOSBox Games/Apps

in DOSBox Games/Apps

(disclaimer: I probably don't know what I'm talking about in this post :blush:) I was thinking not about mounting host fs directory as a cdrom, but for reading image data which can be copied to block device buffer by dosbox. It could be also simpler to do that just by replacing cdrom driver (one …

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