Re: Speedy3D support in DOSBox
Posted on 2024-02-08, 15:13
Perhaps 16 is hexadecimal? If so, bit 22 (decimal) refers to the D/B (Default operand size/Big) bit from the segment descriptor: 0=16-bit, 1=32-bit, and in your example the bit is set.
Re: Speedy3D support in DOSBox
Posted on 2024-02-07, 15:31
LEA calculates an address and doesn't access memory.
Re: Speedy3D support in DOSBox
Posted on 2024-01-06, 05:17
Video BIOS is at C000:0000, linear address 0xC00000. My example with PhysMake was based on real mode segment and offset for the system BIOS. Perhaps the apps you are looking at use protected mode, and thus reference 32-bit offsets within a descriptor.
Re: Speedy3D support in DOSBox
Posted on 2023-12-10, 00:40
FYI, segment 0xF000 is the system BIOS region, segment 0xC000 is the video BIOS region (for EGA/VGA). Use phys_write to write to BIOS (read-only) regions, because mem_write cannot. Perhaps this was your intent: Copy code to clipboard 1 phys_writed(PhysMake(0xF000, 0x09FC), 0x00000079);
Re: Speedy3D support in DOSBox
Posted on 2023-12-06, 07:26
Make sure you are using the core=normal setting, as the instruction pointer skipping around could be due to the dynamic core that executes blocks of instructions where the debugger can only be active between blocks.
Re: swapping CDs in a physical CD ROM drive
Posted on 2023-11-28, 05:18
FYI, in addition to swapping mounted images, Control-F4 also rescans drives (by discarding the cached directory contents), so that may have been the solution after inserting a different disc in the physical optical drive. Rescanning isn't necessary when switching disks with physical floppy drives …
Re: Lunicus, DosBox 0.74, Win3.1
Posted on 2023-11-22, 22:44
Perhaps I have a different version of the game, as it appears to work fine in 0.74 and SVN with Windows 3.1 or 3.11 enhanced mode with Win32s installed. I saw no mention of SHARE during installation. However, there are paging access errors with the default CPU type (the infamous "Unexpected DOS …
Re: Pirates: Captain's Quest Menu Bar Rendering on Top of Game window
Posted on 2023-11-10, 19:14
That sort of thing is almost certainly a behavior of the game, or perhaps of Windows, rather than an issue with DOSBox. Perhaps there is an option to "hide" or otherwise not show the menu bar. For example, the menu appearing only when the pointer is moved to the top of the screen.
Re: looking for old ega DOS PC GAME
Posted on 2023-10-17, 18:16
the title was ONE WORD i always thought the title was OTOPOS but i checked it and thats a different game .... (maybe similar ) scifi game setting 1st person : you navigate through a spaceship with narrow corridors and crude early drawn graphics which imitate a 3d 1st person perspective you could …
Re: Hostage: The Rescue Mission
Posted on 2023-10-14, 20:53
In SVN with machine=ega, reducing cycles to 500-600 range reduces flicker in the intro substantially.
Re: Ancient DOS Games Webshow
Posted on 2023-10-07, 04:48
You may find that Reaping the Dungeon looks a bit better with the machine=vgaonly setting in DOSBox, as it displays 9-dot wide text as real VGA does, so that the alphanumeric characters have gaps between them.
Re: Tony & Friends in Kellogg's Land
Posted on 2023-09-11, 21:14
The guidance I offered is for official DOSBox (0.74-3 or SVN) but may not work for forks. The cycles=10000 setting prevents stuttering on my system; however, you may need a lesser or greater value on your system.
Re: Tony & Friends in Kellogg's Land
Posted on 2023-09-11, 20:44
Seems to work fine in DOSBox with default settings except: machine=vgaonly, core=normal, cycles=10000. The vgaonly machine type is needed for water to look as it should, and the core and cycles are needed for the sound to work. Of course you should also run the game's setup and enable SB sound with …
Re: Can't install Jurassic Park CD-ROM
Posted on 2023-09-10, 00:56
Re: Jurassic Park (Ocean)
Re: Software for the IBM PC Light Pen?
Posted on 2023-09-06, 08:37
Sargon III supports light pen. It uses function 4 of INT 10h to read the pen, so perhaps it would be useful to test around that function of the BIOS.
Re: PCEM Hercules
Posted on 2023-08-07, 19:53
Some background on the "blend" option finding its way into 86box: https://github.com/86Box/86Box/issues/260 https://www.vogons.org/viewtopic.php?f=31&t=25987 The idea was to simulate behavior of CRT scan lines showing some appearance of intensity when horizontally adjacent pixels "bleed" into one …
Re: Command line length bug
Posted on 2023-07-20, 20:29
Longer command lines are accepted by the internal shell, which can handle them -- and this is very useful for multi-image mount commands that can be long indeed. However, the command tail that is copied into the PSP is predictably clipped to what can fit when executing DOS programs.
Re: int 21h AH=0ah bug
Posted on 2023-07-15, 19:57
It's fixed in SVN.
Re: Jack Orlando DOS version.
Posted on 2023-07-04, 11:25
FYI, the game works correctly (no freeze/hang) with the default machine type in SVN.
Re: Large number of demoscene stuff crashes with UMB enabled, but is fine with UMB disabled
Posted on 2023-06-20, 15:02
Real DOS returns an error code to the calling program when memory allocation/deallocation functions fail due to a corrupt MCB chain. However, the system will likely be halted if/when the program tries to exit back to DOS with a corrupt MCB chain, where there will be a message like "Unable to load …
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