Re: How does an x86 CPU swtich from 16 to 32bit mode?

Posted on 2017-01-05, 03:41

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by ripsaw8080

in Milliways

in Milliways

Of course it's not possible to call a real-mode interrupt directly from protected mode; it's necessary to first switch back to real mode. DOS programs that use protected mode typically employ an interface that eliminates most of the hassles -- some flavor of DPMI or an extender that includes DPMI ( …

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Re: Questions regarding "F-15 Strike Eagle III" CD version.

Posted on 2017-01-04, 19:01

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

It seems you just need to copy one file from the CD-ROM to the installation directory to get the Iraq '93 missions working: Assuming that the current directory is the installation directory and that the CD is mounted on D: COPY D:\F15\FS\DS.REL

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Re: How does an x86 CPU swtich from 16 to 32bit mode?

Posted on 2017-01-04, 01:46

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by ripsaw8080

in Milliways

in Milliways

In addition to giving access to more memory, protected mode also switches the CPU into using 32-bit registers by default. If you want to use 32-bit registers in real mode then the 66h prefix byte is the only way. Most assemblers will add the prefix byte and use 32-bit constants automatically if you …

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Re: How does an x86 CPU swtich from 16 to 32bit mode?

Posted on 2017-01-03, 23:31

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by ripsaw8080

in Milliways

in Milliways

http://wiki.osdev.org/Protected_Mode http://wiki.osdev.org/Real_Mode

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Re: Lemmings video issue after hitting F1 to go into next level

Posted on 2016-12-31, 23:18

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

Set machine=vgaonly in the conf file.

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Re: Only 1 line of program shows onscreen

Posted on 2016-12-20, 19:44

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by ripsaw8080

in DOSBox General

in DOSBox General

Topic 47391

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Re: DosBox 0.74 crashes

Posted on 2016-12-07, 13:21

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by ripsaw8080

in DOSBox Development

in DOSBox Development

You may have forgotten, but the forum has not: DosBox 0.74 hangs using GW 3.0a using any Range except Conv

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Re: Christoph Kolumbus | Exploration | Voyages of Discovery - Font Problems

Posted on 2016-12-05, 21:13

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

The issue is fixed in SVN, so try using an SVN build.

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Re: Bug in Dosbox 0.74: music in Worms demo fails (notes are wrong!), well on real msdos

Posted on 2016-12-03, 02:25

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by ripsaw8080

in DOSBox Development

in DOSBox Development

The core=auto setting uses normal core when the emulated CPU is in real mode, and dynamic core when in protected mode. It is the dynamic core that seems to affect the SB sound in this demo. There are, of course, differences in the way the cores work, but I don't know the causative factor for the …

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Re: Bug in Dosbox 0.74: music in Worms demo fails (notes are wrong!), well on real msdos

Posted on 2016-12-02, 20:50

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by ripsaw8080

in DOSBox Development

in DOSBox Development

For this particular demo use normal core with SB sound. Do try GUS sound, though, as I think it is superior in this case.

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Re: Hired Guns and the Great Gravis Ultrasound Mystery!

Posted on 2016-11-10, 15:47

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by ripsaw8080

in Milliways

in Milliways

Enverex wrote: Possibly a silly question, but there's no Ultrasound option in setup for this game. How do you actually tell it to use GUS rather than Roland/SB/ADlib? Do read Cloudschatze's initial post, specifically the part about the European and North American releases of the game.

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Re: Extract VGA palette from RAM

Posted on 2016-11-07, 18:16

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by ripsaw8080

in DOSBox General

in DOSBox General

Well, the 8-bit RGB values in a screencap PNG palette are what you want if you shift them right by 2 bits.

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Re: Extract VGA palette from RAM

Posted on 2016-11-07, 17:44

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by ripsaw8080

in DOSBox General

in DOSBox General

It's nowhere in memory to be dumped. You can read it out of the VGA DAC registers (port 0x3c7 is read index, port 0x3c9 is data), but if you're only interested in the default palette then you can get that from the DOSBox source code: vga_palette[] array in int10_modes.cpp

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Re: 3D Gamestudio ACKNEX 3

Posted on 2016-11-05, 19:30

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

You only need the TLIVESA driver if you plan to use the app's -VESA option with the machine=svga_et4000 setting as well as the -I and -S options. If you use the default machine=svga_s3 setting then the -VESA option works without extra drivers.

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Re: 3D Gamestudio ACKNEX 3

Posted on 2016-11-05, 18:26

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

Maybe I just have the paths setup wrong? Yes, it can't find the files that way. Use the same mount command as before, if that works for you, then: C: CD DEMO \PROFI\WED -VGA VRDEMO Then it complains about a syntax error in MOVE.WDL, but editing out the stray curly brace gets the thing running. It …

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Re: Gateway 2 (and others) MT-32 MIDI tempo off?

Posted on 2016-11-04, 03:21

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

False positives happen, I guess. Reposted the attachment with a password; I hope it's enough to shut out Chrome's scanning. @keropi: The workaround is hardcoded for an MPU using IRQ 9, but it's unlikely to be useful in your case. It might help with SoftMPU, which uses the DOSBox MPU emulation.

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Re: Gateway 2 (and others) MT-32 MIDI tempo off?

Posted on 2016-11-02, 21:20

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

After some analysis of the Legend MPU playing code, I made a workaround program that corrects the tempo issue in my tests. Gateway has an additional but apparently related issue where it doesn't play more musical selections after the first one during the game, and as a bonus this new workaround does …

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Re: Suggestion: IBM Music Feature card

Posted on 2016-11-02, 16:48

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by ripsaw8080

in DOSBox General

in DOSBox General

The FB-01 and IMFC are more synthesizer than sound card, with a Z80 CPU and standard sounds stored in ROM. As such, if an emulation is made then it will probably be like MUNT: fully external to DOSBox, or possibly integrated in unofficial builds.

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Re: DOSBox SVN Builds

Posted on 2016-10-29, 20:04

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by ripsaw8080

in DOSBox Development

in DOSBox Development

Almost any command available within is also available without: dosbox.exe -c "config -wc" -c "exit" It's all documented in the README, of course.

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Re: DOSBox emulation of the SBPro is reversed to the real hardware.

Posted on 2016-10-27, 09:42

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by ripsaw8080

in DOSBox Development

in DOSBox Development

Harekiet's program may already test my idea, or at least some permutations of it, as long as there are resets before each test. However, one-byte transfers are unusual and could cause behavior that obscures or interferes with other behaviors, so I would also like to test with "normal" transfers. BTW …

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