Re: Processor choice for later dos games

Posted on 2019-02-28, 07:22

by

by jmarsh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Back in those days, "60 fps" wasn't a thing. 30 fps was considered to be "perfectly smooth" gameplay. I doubt these game engines were designed to run much faster than 30 fps to be honest. Descent is a good example; homing missiles reorient towards their target by a fixed amount per frame (rather …

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Re: SCSI2SD - Comparison of SCSI SD, CF, and HDD performance

Posted on 2019-02-28, 03:29

by

by jmarsh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Electrically there is no difference between a SDHC and an SDXC card, it's just a marketing gimmick. Given that the maximum partition size for FAT16 is ~4GB (or ~8GB if you use 128KB clusters), it would make no difference if the card were 32 or 64GB.

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Re: Any good MS-DOS 80386/80486 games for testing Virtual memory support?

Posted on 2019-02-27, 15:59

by

by jmarsh

in PC Emulation

in PC Emulation

That's a bit weird, I'm very familiar with Descent's source code and it doesn't use floating point math - all the 3D stuff is completely fixed-point/integer based. If there's any FPU ops they must be in the audio driver (the HMI stuff) or VR drivers since they were 3rd party and not included with …

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Re: Processor choice for later dos games

Posted on 2019-02-27, 06:22

by

by jmarsh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Newsflash: Dosbox can barely be called close to cycle-accurate. TTD was released in 1995, it definitely doesn't need a 450MHz P2. It was a very well written game compared to other 640x480 titles at the time.

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Re: Processor choice for later dos games

Posted on 2019-02-27, 05:06

by

by jmarsh

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

awgamer wrote: Here's a list of some intensive dos games that a pentium1/mmx may not be enough to run well or at max settings: transport tycoon, deluxe I distinctly remember playing TTD on a 486DX4 and it ran fine, why is it in this list?

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Re: Doom and Duke3D Issue

Posted on 2019-02-17, 05:15

by

by jmarsh

in Marvin \ Software

in Marvin \ Software

That looks as expected to me. Have you played the original versions before or only newer ports with better graphics?

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Re: DOSBox-X branch

Posted on 2019-02-02, 13:56

by

by jmarsh

in DOSBox Patches

in DOSBox Patches

The problem may not be related to just the difference in precision, fpu_instructions.h is a very minimal x87 implementation that doesn't always take FP exceptions when it should or set flags correctly for many instructions. Using "long double" won't fix that. Intel made a utility to test for correct …

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Re: PowerPC Dynamic Recompiler (patch)

Posted on 2019-02-01, 10:24

by

by jmarsh

in DOSBox Development

in DOSBox Development

Afaict that's a different ISA. PowerPC (what this dynrec is) branched off from the POWER line, so while they have a similar base they're not compatible.

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PowerPC Dynamic Recompiler (patch)

Posted on 2019-01-31, 18:45

by

by jmarsh

in DOSBox Development

in DOSBox Development

So I started this over 5 years ago, left it unfinished for a few years and now started from scratch and got it into a fit state for submitting... This patch adds a dynamic recompiler for 32-bit PowerPC, based on the existing dynrec framework. I've only tested it on a wii but there should be no …

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Re: Serial mouse support is NEEDED for this game.

Posted on 2015-03-25, 13:14

by

by jmarsh

in DOSBox Development

in DOSBox Development

That just means I submit a change to the code. It allows somebody else to patch their copy of the DosBox EXE file, to give their own copy of the EXE file the same feature as my compiled modded version of the EXE file. That's assuming that they have the same tool to apply the patch as I have to make …

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Re: Serial mouse support is NEEDED for this game.

Posted on 2015-03-25, 10:52

by

by jmarsh

in DOSBox Development

in DOSBox Development

Are you unfamiliar with the concept of submitting a patch?

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Re: CD audio pre-emphasis and its implications for DOSBox

Posted on 2015-01-23, 19:35

by

by jmarsh

in DOSBox General

in DOSBox General

Perhaps, if enough games could benefit, but otherwise I don't think it would be worth the effort. Analog domain audio processing seems kind of heavy to run in parallel with emulation for the single-threaded DOSBox, but supporting DSP plugins on a separate CPU thread could have lots of interesting …

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Re: CD audio pre-emphasis and its implications for DOSBox

Posted on 2015-01-23, 16:36

by

by jmarsh

in DOSBox General

in DOSBox General

It looks like pre-emphasis can be signalled in the CUE file using the FLAGS command, maybe dosbox could look for this and automatically apply de-emphasis during playback?

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Re: Can anyone help me get DOSBox running on my PPC Mac?

Posted on 2014-09-24, 11:05

by

by jmarsh

in DOSBox General

in DOSBox General

Still a work in progress.

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Re: Date & Time Mismatch?

Posted on 2014-02-22, 09:39

by

by jmarsh

in DOSBox Games/Apps

in DOSBox Games/Apps

There are already third-party forks that have implemented it for some platforms.

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Re: Date & Time Mismatch?

Posted on 2014-02-22, 08:21

by

by jmarsh

in DOSBox Games/Apps

in DOSBox Games/Apps

Or they could just use "set arj_sw=-c" like has already been suggested.

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Re: New util for DosBox users.

Posted on 2014-02-22, 07:40

by

by jmarsh

in DOSBox General

in DOSBox General

Can you make a proof-of-concept build with FLAC enabled and we'll use it as an excuse to pester gog.com to stop packaging cd audio tracks in lossy formats? 😁

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Re: New util for DosBox users.

Posted on 2014-02-22, 07:26

by

by jmarsh

in DOSBox General

in DOSBox General

collector wrote: Now if only DOSBox supported more audio formats. It should work with anything supported by the SDL_Sound library, what other unhandled formats would you want to use?

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Re: Date & Time Mismatch?

Posted on 2014-02-22, 07:03

by

by jmarsh

in DOSBox Games/Apps

in DOSBox Games/Apps

FeedingDragon wrote: What I was semi-asking was.... Isn't there a file library in standard C++ (the language DOSBox code "appears" to be written in,) that has file date/time commands? There is not, that is precisely the problem.

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Re: Date & Time Mismatch?

Posted on 2014-02-22, 05:02

by

by jmarsh

in DOSBox Games/Apps

in DOSBox Games/Apps

but thats kind weird though, in *nix realm we have "touch" program, on dos realm, i remember Norton Utilitiess have a program called "FD.exe" or "File Date", which thanks to compatibility, also works on 32-bit windows regardless the underlying FileSystem (FAT/NTFS). there also "touch" for windows …

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