Re: DOSBox Sound Blaster emulation (Lowpass Filtering)

Posted on 2020-01-09, 13:23

by

by jmarsh

in DOSBox Development

in DOSBox Development

But if you're not capturing the output directly (using the wav capture function), you're testing the frequency response of your output device rather than the emulator...

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Re: DOSBox Sound Blaster emulation (Lowpass Filtering)

Posted on 2020-01-09, 13:02

by

by jmarsh

in DOSBox Development

in DOSBox Development

How exactly are you sampling the audio from DOSBox?

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Re: Running Amazon Trail From CD-Rom in Dosbox

Posted on 2020-01-09, 04:57

by

by jmarsh

in DOSBox Games/Apps

in DOSBox Games/Apps

You can mount physical CDs using the "-t cdrom" option.

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Re: $$$ to Convert Lotte's CRT Shader for DosBOX Daum

Posted on 2020-01-09, 04:30

by

by jmarsh

in DOSBox General

in DOSBox General

If anything the dynamic cores are more stable since they handle page faults and other exceptions more gracefully. I just checked with a 12 year old compiler (VS2008), nearly all switch/case statements use a direct table (one lookup) or indirect table (two lookups). If you can give an example of one …

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Re: $$$ to Convert Lotte's CRT Shader for DosBOX Daum

Posted on 2020-01-09, 01:28

by

by jmarsh

in DOSBox General

in DOSBox General

The only way that could possibly be true is if you were talking about the huge switch/case tables for the opcode decoding in the normal/full cores (nothing else comes close to occupying 20% of execution time)... which is why the dynamic cores exist.

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Re: $$$ to Convert Lotte's CRT Shader for DosBOX Daum

Posted on 2020-01-08, 23:37

by

by jmarsh

in DOSBox General

in DOSBox General

It's not as if DOSBox uses any features unavailable in OpenGLES; it goes out of its way to maintain GL 1.1 compatibility.

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Re: $$$ to Convert Lotte's CRT Shader for DosBOX Daum

Posted on 2020-01-08, 22:55

by

by jmarsh

in DOSBox General

in DOSBox General

Pixel perfect shouldn't be adding much; all it does is duplicate pixels. It's just byte-copying without any processing, unlike other scalers. But you can get the GPU to do it for you by using aspect=true, output=openglnb and an output resolution that is a multiple of both 4:3 and the original …

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Re: $$$ to Convert Lotte's CRT Shader for DosBOX Daum

Posted on 2020-01-08, 21:31

by

by jmarsh

in DOSBox General

in DOSBox General

Nothing to do with switch-case statements. Fade-in/outs are nearly always implemented using palette changes which have significant emulation cost (regardless of the output mode).

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Re: Steam bootstrapper - require 2nd login?

Posted on 2020-01-07, 20:56

by

by jmarsh

in Milliways

in Milliways

Then you're the product, not the consumer.

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Re: Steam bootstrapper - require 2nd login?

Posted on 2020-01-07, 20:41

by

by jmarsh

in Milliways

in Milliways

Did you pay for it?

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Re: Running Dos 6.22 on dosbox (clean svn): why do the cycles switch to "max"?

Posted on 2020-01-07, 20:29

by

by jmarsh

in DOSBox General

in DOSBox General

It does happen if you manage to load EMM386 in DOSBox's DOS. V86 mode doesn't really achieve much (except create a lot more work for the emulator) so there's no reason to have it active by default. It does get activated by a few games (Wing Commander series).

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Re: Running Dos 6.22 on dosbox (clean svn): why do the cycles switch to "max"?

Posted on 2020-01-07, 16:48

by

by jmarsh

in DOSBox General

in DOSBox General

V86 mode is protected so it's treated the same as games.

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Re: Running Dos 6.22 on dosbox (clean svn): why do the cycles switch to "max"?

Posted on 2020-01-07, 15:27

by

by jmarsh

in DOSBox General

in DOSBox General

DOS is probably loading EMM386 which switches to V86 mode.

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Re: PowerPC Dynamic Recompiler (patch)

Posted on 2020-01-05, 08:43

by

by jmarsh

in DOSBox Development

in DOSBox Development

I definitely remember finding a bug in Descent's source code related to the timed text rendering on briefing screens but I can't remember the details. I think it was rendering everything twice when adding each letter which caused obvious slowdown - you can see it in the enemy briefings, the rotating …

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Re: Remapping BREAK key on Macbook for interrupting GW-BASIC and other stubborn ancient programs

Posted on 2020-01-05, 07:13

by

by jmarsh

in DOSBox General

in DOSBox General

The "Pause" button in the mapper isn't a key, it's an emulator event (that funnily enough, pauses emulation). Disregard it. The "SCL" key is the one you need to add a binding to. But if you're going to bind F12 to it be aware ctrl+F12 is already bound to another event (cycles+) by default. Simple …

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Re: PowerPC Dynamic Recompiler (patch)

Posted on 2020-01-04, 08:09

by

by jmarsh

in DOSBox Development

in DOSBox Development

Palette updates can cause slowdown in DOSBox, I know Descent's credits use them and the loading screens have fade-in/fade-outs. I can't remember if they're done unconditionally for every frame or only when a color is actually modified though.

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Re: Welcome to the updated VOGONS

Posted on 2020-01-02, 06:22

by

by jmarsh

in Milliways

in Milliways

The site uses emoji now, and there are around 3000 of those, so there’s not a button to list them any more since it would be a very large list. You can use a built-in emoji keyboard :keyboard: of your OS, :sparkles: :shortcodes: :sparkles: (which have autocompletion as you type), or the O.G. …

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Re: PowerPC Dynamic Recompiler (patch)

Posted on 2020-01-02, 05:56

by

by jmarsh

in DOSBox Development

in DOSBox Development

Smells like a 64-bit ABI issue, but I'm not completely positive because it looks like the backtrace info for the call to mem_writeb_checked_drc is hiding the real parameter value. The emitted instructions look like translation of LEA: r29 is loaded from a cpu reg (base), added with a segment reg, …

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Re: Giant retro TV memories

Posted on 2020-01-02, 03:34

by

by jmarsh

in Milliways

in Milliways

I doubt they'd be bright enough to work with a light gun.

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Re: In this new decade, let us remember the Y2K Bug

Posted on 2020-01-02, 02:42

by

by jmarsh

in Milliways

in Milliways

Were they the same guys who decided the first hour of each day would use the biggest number (12)?

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