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

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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

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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

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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

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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

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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

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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

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

Posted on 2021-09-24, 18:44

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by ripsaw8080

in DOSBox General

in DOSBox General

The INT 1Fh table should be 1024 bytes for CGA, EGA, and VGA. INT 43h is the pointer that doesn't exist for CGA, which is for the lower half of the character set that is also 1024 bytes in size. When you put both halves of the set together is it 256 x 8 = 2048 bytes, and in EGA/VGA the tables are …

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

Posted on 2021-09-24, 18:18

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by ripsaw8080

in DOSBox General

in DOSBox General

CGA and Hercules cards do have a character generator ROM, but it is only visible to the card and not to the CPU, and in text mode fonts can only be modified by replacing the ROM chip. The Hercules Plus adds definable fonts, but that card is not emulated by DOSBox. An 8x8 font for characters 00h-7Fh …

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

Posted on 2021-09-23, 22:03

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by ripsaw8080

in DOSBox General

in DOSBox General

The buffer only needs to be 1024 bytes (128 x 8), and if you set all the bytes to zero then the characters will all be blank like a null or space character.

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

Posted on 2021-09-23, 17:34

by

by ripsaw8080

in DOSBox General

in DOSBox General

The character patterns are stored in ROM (read-only memory), so you can't write to it. You will have to copy the patterns (with your modifications) into writeable memory (RAM) and then point the INT 1Fh vector there. It should work nicely to have the writeable memory in the resident portion of a TSR …

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Re: Quick Basic WIDTH statement (low level VGA stuff question)

Posted on 2021-09-23, 17:31

by

by ripsaw8080

in DOSBox General

in DOSBox General

Same place you linked before, but for int-10-11 instead of int-10-12. There are multiple places where you can find the RBIL (Ralf Brown's Interrupt List) online. However, for the kind of detail I went into you can look at the DOSBox source code (int10.cpp) 😉

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Re: Quick Basic WIDTH statement (low level VGA stuff question)

Posted on 2021-09-23, 14:33

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by ripsaw8080

in DOSBox General

in DOSBox General

It calls INT 10h/AX=1123h which sets the INT 43h vector to the address of the 8x8 character patterns in the video ROM (video BIOS uses INT 43h to draw characters in graphics mode), sets the BIOS character height at 40h:85h to 8, then sets the BIOS row count at 40h:84h to 59 (rows minus 1).

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Re: Armored Fist 2 ctd in dosbox

Posted on 2021-09-15, 03:10

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

Well, wait and see how it goes after playing awhile, as there may be only a reduced frequency of the cache block problem. Anyway, more memory is not always better in DOS games, because too much can and does cause issues in some cases.

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Re: Armored Fist 2 ctd in dosbox

Posted on 2021-09-15, 02:42

by

by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

Yes, default settings except memsize, so DOSBox is switching to dynamic core due to core=auto and AF2 running in protected mode. Which host CPU and OS are you running DOSBox on?

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Re: Armored Fist 2 ctd in dosbox

Posted on 2021-09-15, 01:34

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

I've been using memsize=31, and no problems with cache blocks so far. BTW, AF2's last patch is v1.03, in case you don't already have that version.

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Re: Armored Fist 2 ctd in dosbox

Posted on 2021-09-14, 23:50

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

The maintainer of the ECE build also provides builds of straight SVN source. There's a link to the website in the maintainer's signature: DOSBox ECE (for Windows & Linux) The builds not labeled as "ECE" are the straight SVN builds.

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Re: Armored Fist 2 ctd in dosbox

Posted on 2021-09-14, 23:28

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

I installed from a disc image as normal. If you haven't tried it already, I suggest using a build of straight SVN source, as many improvements have been made to the dynamic core. However, as I mentioned before, running out of cache blocks can be avoided by using normal core, though depending on the …

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