Re: [Help needed] Using DOSBox to disassemble Rayman.

Posted on 2011-12-06, 09:02

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by ripa

in DOSBox Development

in DOSBox Development

IDA Free version doesn't have a loader for Linear Executables. You'll have to dump the executable code pages from the executable into .bin files and then load them manually into IDA Free. edit: I wonder if you could convert the LE to ELF or PE.

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Re: Using dosbox as a disassembler

Posted on 2011-11-25, 19:56

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by ripa

in DOSBox General

in DOSBox General

I've been thinking of the exact same feature. My current process (when debugging 3 stooges sound for example ) has been to add a breakpoint in Dosbox to some interesting location, dumping the code and data segments to BIN files after hitting the breakpoint, and then loading the BINs into IDA free, …

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Re: Want to use PC Speaker and not Sound Blaster in StarControl 1

Posted on 2011-10-30, 15:05

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by ripa

in DOSBox Patches

in DOSBox Patches

1>msvcrt.lib(ti_inst.obj) : error LNK2005: "private: __thiscall type_info::type_info(class type_info const &)" (??0type_info@@AAE@ABV0@@Z) already defined in LIBCMT.lib(typinfo.obj) 1>msvcrt.lib(ti_inst.obj) : error LNK2005: "private: class type_info & __thiscall type_info::operator=(class type_ …

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Re: Want to use PC Speaker and not Sound Blaster in StarControl 1

Posted on 2011-10-29, 15:49

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by ripa

in DOSBox Patches

in DOSBox Patches

I implemented better interpolation/filtering. Now Hard Drivin' 2 intro sounds pretty good. Perestroika intro also sounds almost exactly the same as the real thing. The improvement is mostly audible in games that use the PC speaker for outputing digitized sound. If you can hear a high-pitched whine …

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Re: fullscreen lag

Posted on 2011-10-24, 17:14

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by ripa

in DOSBox General

in DOSBox General

I've noticed fulldouble=true causes stuttering on some graphics cards. Try setting it to false.

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Re: How do you play games on DOSBox if the game is stored on a flash drive?

Posted on 2011-10-20, 20:14

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by ripa

in DOSBox General

in DOSBox General

Post the exact thing you're typing in dosbox. It should work like this in Dosbox: Z:\> mount c f:\ Z:\> c: Z:\> cd ARENA C:\ARENA> ARENA (assuming you've installed arena to f:\arena)

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Re: Want to use PC Speaker and not Sound Blaster in StarControl 1

Posted on 2011-10-16, 07:21

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by ripa

in DOSBox Patches

in DOSBox Patches

Have to tell you that I currently attempt to rewrite the system timer, so the interface to the pcspeaker code may change if it works out. What kind of a plan do you have for the rewrite? Currently, the speaker code duplicates a large amount of PIT functionality. If it's possible to have the PIT …

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Re: Want to use PC Speaker and not Sound Blaster in StarControl 1

Posted on 2011-10-15, 19:23

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by ripa

in DOSBox Patches

in DOSBox Patches

What was it that fixed 3 Stooges? My initial implementation of mode 1 (that worked in StarCon 1) was incomplete/buggy. It didn't generate some (every other or so) low pulses it was supposed to. Same thing caused louder whine in Wizball and Perestroika.

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Re: Want to use PC Speaker and not Sound Blaster in StarControl 1

Posted on 2011-10-15, 18:12

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by ripa

in DOSBox Patches

in DOSBox Patches

300 cycles explains why 3 Stooges was quiet. I was experimenting at 3000 cycles ("You idiots!"). I've attached the third revision. It fixes Nope and Atom demos, reduces whine in Wizball and Perestroika, and fixes The Three Stooges speech (normal core, cycles < 1000). What's next: - look at Battle …

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Re: Want to use PC Speaker and not Sound Blaster in StarControl 1

Posted on 2011-10-14, 22:18

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by ripa

in DOSBox Patches

in DOSBox Patches

Good news: I found a bug in my mode 1 implementation, which caused Wizball and Perestroika's whine to be too audible. With the correction, the whine is much higher in frequency, and so less audible, and easier to remove by filtering (once I implement the filter, that is). Bad news: I looked into how …

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Re: Problem recording videos with DOSBox 0.74

Posted on 2011-10-13, 23:19

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by ripa

in DOSBox General

in DOSBox General

The game switches to another video mode, so Dosbox needs to create another AVI file with a different resolution and frame rate. You'll have to splice together the videos afterwards.

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Re: Want to use PC Speaker and not Sound Blaster in StarControl 1

Posted on 2011-10-13, 22:27

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by ripa

in DOSBox Patches

in DOSBox Patches

Thank you very much for those recordings. I thought I there were problems with the emulation, but it's supposed to sound like that. The silent noise in the menus is caused by the game setting the pc speaker output to a very high frequency (like 500 kHz). That frequency isn't audible directly, but I …

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Re: Want to use PC Speaker and not Sound Blaster in StarControl 1

Posted on 2011-10-12, 21:30

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by ripa

in DOSBox Patches

in DOSBox Patches

Lowering pcrate helps Perestroika a great deal, but with Wizball the "whine" only becomes lower in pitch. Not sure, but I think both are using pulse widths. Would a low-pass filter make sense? A better low-pass filter would work. I'll try implementing this at some point. The digitized sound in 3 …

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Re: Want to use PC Speaker and not Sound Blaster in StarControl 1

Posted on 2011-10-09, 21:39

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by ripa

in DOSBox Patches

in DOSBox Patches

Here's another revision. This one fixes Keen 1's sounds like NY00123s patch without breaking Monkey Island or Digger. Hard Drivin 2 motor sound now has a buzz, but it drowns out everything else. I need to investigate that more. A recording of Hard Drivin' 2's motor buzz from a real PC would be …

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Re: Want to use PC Speaker and not Sound Blaster in StarControl 1

Posted on 2011-10-04, 19:04

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by ripa

in DOSBox Patches

in DOSBox Patches

Thanks for testing! I'll take a look at those games next.

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Re: Want to use PC Speaker and not Sound Blaster in StarControl 1

Posted on 2011-10-04, 16:50

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by ripa

in DOSBox Patches

in DOSBox Patches

See attached ZIP file for a Windows executable and changed source files. I used svn rv3742 as a base. I didn't bother finding all the libraries, so the binary doesn't support networking, image capturing, etc. In addition to StarCon, I tested this in Keen 1, Secret Agent, Supaplex, Monkey Island 1, …

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Re: Want to use PC Speaker and not Sound Blaster in StarControl 1

Posted on 2011-10-03, 22:10

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by ripa

in DOSBox Patches

in DOSBox Patches

I implemented "PIT mode 1" so Star Control PC speaker music works. I also fixed (some of the) clicking in Bane of the Cosmic forge. It's very late, so I'll post my modifications and a Windows binary tomorrow or soon after. edit: deleted dead link D:

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Re: Problems with video desynch in Version 0.74

Posted on 2011-09-16, 17:49

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by ripa

in DOSBox General

in DOSBox General

It's a bit difficult to explain, but whenever there isn't enough CPU time for Dosbox, Dosbox becomes "late" from real-time (and so does the recorded game sound and video). Your recorded voice, however, stays real-time, so they grow out of sync gradually. The effect is more pronounced if you set …

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Re: Escaping the box (or how to talk to programs outside of DOSBox)

Posted on 2011-09-13, 17:13

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by ripa

in DOSBox Development

in DOSBox Development

I plan to implement a custom driver that is loaded before the game starts and then have the driver handle synchronization with the game and the external program. Would this sort of setup even be possible? You could register a custom I/O handler in Dosbox and use port I/O from within dosbox to …

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Re: Experimental patch: An attempt to improve PC Speaker emulation accuracy

Posted on 2011-08-28, 18:10

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by ripa

in DOSBox Development

in DOSBox Development

I made some modifications to PC speaker emulation a while ago (tried to fix popping). If you're interested in incorporating my changes, check out: http://www.vogons.org/viewtopic.php?p=158145 It would be incredibly helpful if someone had a scope and captured the pre-filtered (e.g. on or off voltage) …

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