Re: Filters not working with EGA games?

Posted on 2022-01-16, 12:26

by

by ripsaw8080

in DOSBox General

in DOSBox General

I guess you mean "scaler" rather than "filter". The dithered EGA modes that you seem to be interested in actually have a 640x200 pixel resolution that is line-doubled to 400 lines. On a real system the line-doubling is done by stretching in the video display, but DOSBox uses an internal double- …

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Re: Similar game to Fire Fight?

Posted on 2022-01-14, 00:51

by

by ripsaw8080

in Windows

in Windows

You've mentioned games with an isometric view; is that criteria for suggestions? If so then perhaps Bedlam

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Re: Top Gun: Fire at Will Installation

Posted on 2022-01-06, 08:21

by

by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

Please do not post links in this forum to software still under copyright. No support is provided here for pirated software; ask where you downloaded from. Thread closed.

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Re: How does Sierra's EGA640.DRV even work?

Posted on 2021-12-28, 11:24

by

by ripsaw8080

in DOS

in DOS

Oh, and I found a Youtube video about LSL5 EGA. Too bad getting a copy is going to be nearly impossible. Nowhere near that difficult, but probably not cheap. https://www.ebay.com/itm/363445781749 Just make sure there are pictures of disks that specify 16-color, as the specs on the box could more …

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Re: How does Sierra's EGA640.DRV even work?

Posted on 2021-12-22, 08:48

by

by ripsaw8080

in DOS

in DOS

FYI, some LucasArts adventure games offer the same kind of dithering with their "e" display option: Monkey Island 256-color, Monkey Island 2, Fate of Atlantis.

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Re: How does Sierra's EGA640.DRV even work?

Posted on 2021-12-21, 17:34

by

by ripsaw8080

in DOS

in DOS

Question about Sierra's EGA640.DRV dithering

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Re: is there some reliable/suggested way to play midi files with OPL2-emulation ?

Posted on 2021-12-07, 02:34

by

by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

George "The Fat Man" Sanger is credited with the GM timbres for OPL2 in quite a few DOS games, and I believe it is those instrument definitions that were used in Windows 3. The instrument sounds were made into a soundfont, but it is of course not an actual FM chip or an emulation of one: https:// …

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Re: Virtua Chess demo terminates with "card not 100% compatible VGA" error

Posted on 2021-11-30, 18:23

by

by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

The game has a test that expects raster ops to work in text mode, and while they technically should work in all modes, AFAIK they're only really used in graphics mode. Official DOSBox does not implement raster ops in text mode, presumably for performance reasons, so that may not change just to …

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Re: Calculatory inconsistency between DOSBOX/Win and DOSBOX/x86 Linux/ARM

Posted on 2021-11-10, 05:10

by

by ripsaw8080

in DOSBox Development

in DOSBox Development

The interrupt mask test is apparently supposed to fail, as it causes a different set of tests to run. DOSBox passes all 8087 tests, but there is apparently an issue with at least one of the non-8087 tests. The first failing test is FINIT, FLDLG2, F2XM1 three times, FLDT to load an 80-bit constant, …

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Re: Calculatory inconsistency between DOSBOX/Win and DOSBOX/x86 Linux/ARM

Posted on 2021-11-09, 14:35

by

by ripsaw8080

in DOSBox Development

in DOSBox Development

The diagnostic program executes opcode 0xDB 0xE1, which according to docs is FNDISI (no-wait disable interrupts) and only meaningful on the original 8087; 287 and later treat it as no-operation. However, the program is expecting bit 7 of the FPU Control Word to be set after executing the instruction …

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Re: DOSBox-X branch

Posted on 2021-10-31, 14:02

by

by ripsaw8080

in DOSBox Patches

in DOSBox Patches

The RBIL says a few things about divide exception behavior of 8086/8088 in the INT 0 notes: http://www.delorie.com/djgpp/doc/rbinter/id/06/0.html However, I suspect not all is said about edge cases generating an exception (or not) that differ from later processors, so it would be good to test on a …

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Re: is there a way to fix oplmode transition from OPL-3 to OPL-2 ?

Posted on 2021-10-07, 15:25

by

by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

nad53 wrote on 2021-10-07, 15:16: I'm not really sure what "jukebox" program you're refering to. CYBTUNES.ZIP at the author's archived website that I mentioned before.

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Re: is there a way to fix oplmode transition from OPL-3 to OPL-2 ?

Posted on 2021-10-07, 13:51

by

by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

Do you know if there's some way to use that file automatically each time getting outside cybersphere ?? Sure, just use a batch file. For example, the following CS.BAT file allows any of the Cybersphere programs to be run from a menu, and OPL3OFF runs after they exit, but note that it is not run for …

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Re: is there a way to fix oplmode transition from OPL-3 to OPL-2 ?

Posted on 2021-10-03, 16:38

by

by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

More info about the issue; maybe interesting to some: Cybersphere and Cybersphere Plus do not switch off OPL3 mode at exit to DOS, but a separate jukebox program (available from the author's archived website ) does. So, I guess that not switching off could be considered an oversight. For cases where …

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Re: Tie Fighter: Inverting the mouse y-axis

Posted on 2021-10-03, 14:19

by

by ripsaw8080

in DOSBox Development

in DOSBox Development

FYI, SVN can invert mouse motion on either axis by using a negative value with a split sensitivity setting, e.g. sensitivity=100,-100 to invert the Y axis. The feature can be combined with mouse drivers like cutemouse if their non-linear acceleration is preferred.

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Re: is there a way to fix oplmode transition from OPL-3 to OPL-2 ?

Posted on 2021-10-02, 17:15

by

by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

It may depend on the FM driver included in particular versions of Jill; but there is a patch to improve SB sound effects and allow the FM driver version to be selected: https://www.vogons.org/viewtopic.php?f=7&t=31501 At the DOSBox shell command prompt, changing the sbtype= setting, even to what it …

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Re: Best CGA & Hercules monochrome games

Posted on 2021-10-02, 16:44

by

by ripsaw8080

in Marvin \ Software

in Marvin \ Software

And I guess nobody here knows how to use MKBOOT.EXE except ripsaw8080. Well, I have a somewhat complicated procedure to load MKFILE.EXE into upper memory for booting in DOSBox, which is advantageous if all 640 kB of conventional memory is needed. However, MKBOOT.EXE is a different beast. There …

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Re: Extended character table fonts (pointed at by interrupt vector 1Fh)

Posted on 2021-09-25, 11:35

by

by ripsaw8080

in DOSBox General

in DOSBox General

Likely because you don't set the INT 1Fh vector to point back to the characters in ROM before your program ends, so on subsequent runs you copy from where your font variable was located on the previous run, which won't necessarily be the exact same address for each run. Of course you should always …

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Re: Extended character table fonts (pointed at by interrupt vector 1Fh)

Posted on 2021-09-25, 10:13

by

by ripsaw8080

in DOSBox General

in DOSBox General

Well, I had looked at your code, but nothing struck me as being incorrect except the SCREEN 12 for CGA, so I figured the problem would be something less than obvious that requires debugging. Anyway, I pasted your code with the modifications for CGA into a .BAS file and ran it in QB 4.5 (with /l …

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Re: Extended character table fonts (pointed at by interrupt vector 1Fh)

Posted on 2021-09-24, 19:11

by

by ripsaw8080

in DOSBox General

in DOSBox General

Well, rather than debugging your program for you, let me assure you that DOSBox will use the INT 1Fh vector to draw characters 128-255 in graphics mode even for the CGA machine type. 😉

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