Re: com file loading higher than expected

Posted on 2023-05-29, 11:44

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

If the COM file is assembled and linked correctly then the first three bytes in it should be the near jump to the CLEAR_SCREEN procedure. However, the 200h entry point you mention suggests you have made something other than a COM format program file, because DOS (and DOSBox's internal emulation of …

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Re: Block-o-Mania VGA crashes on level 6

Posted on 2023-05-18, 15:44

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

The VGA version, BLOCK.EXE, uses some PIC resource files that the other versions do not use. The QUESMARK.PIC and REDHERE.PIC files may be corrupt, as they lack header data that the other PIC files have. Copying PCURSE.PIC to QUESMARK.PIC prevents the abend on level 6 -- I'm sure the graphics are …

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Re: DOSBox debugger

Posted on 2023-05-06, 13:08

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by ripsaw8080

in DOSBox Development

in DOSBox Development

"Program Files" is likely the problem, as you'd tend to run into UAC. You could try making a shortcut that puts the current directory somewhere not restrictive; or just put the vanilla debugger executable where you're putting the fork executable. The SaveMemory() code in DOSBox-X appears no …

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Re: DOSBox debugger

Posted on 2023-05-04, 05:00

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by ripsaw8080

in DOSBox Development

in DOSBox Development

I wouldn't think so, but then I'd also think the file is being created. What is the current directory in your case?

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Re: DOSBox debugger

Posted on 2023-05-03, 07:48

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by ripsaw8080

in DOSBox Development

in DOSBox Development

In the debugger, the MEMDUMP command creates a text file named MEMDUMP.TXT, the MEMDUMPBIN command creates a binary file named MEMDUMP.BIN. The files are created in the current directory, sometimes referred to as the working directory, which is not necessarily the same as a mounted directory …

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Re: How to run BAO Tower?

Posted on 2023-04-23, 11:46

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

If it's known to work in enhanced-mode Win3 with Win32s (which only supports a subset of the Win32 API) then try the cputype=486_slow or cputype=pentium_slow setting in DOSBox, and maybe memsize=31 if it's from the late 90's.

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Re: Fighter Wing (Merit / Gemsoft): getting engine noise to work

Posted on 2023-04-17, 21:44

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

The engine noise is working for me in 0.74-3 and SVN with the CD version upgraded to v2. The NOISE2.EXE driver being loaded by FWING.BAT is necessary, but curiously it is unloaded by NOISE.EXE (without the "2"). Anyway, it seems there is no option of having music AND engine noise at the same time, …

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Re: How to get the "correct" aspect ratio in some DOS games in DOSBox

Posted on 2023-04-12, 06:01

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

Once again, the aspect ratio issue DOES NOT affect (S)VGA machine types -- it only affects the EGA machine type. Balance of Power, SimCity, and any other games that use mode 10h (640x350x16) have accurate aspect correction if you simply stay with the default machine=svga_s3 setting. I hope this is …

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Re: How to get the "correct" aspect ratio in some DOS games in DOSBox

Posted on 2023-04-12, 02:05

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

It's like history repeating itself: Aspect ratio in SimCity for DOS There is an issue with aspect correction of 350-line modes, but as I mentioned in the previous thread, that issue only affects the machine=ega setting.

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Re: How to get the "correct" aspect ratio in some DOS games in DOSBox

Posted on 2023-04-11, 19:07

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

PC graphics modes below 640x480 resolution have non-square pixels. A notable exception is when mode 13h (320x200x256) is register-tweaked to 320x240, AKA Mode X , but relatively few games use it. The obvious reason why games sometimes have "distorted" shapes is that an artist created the graphics …

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Re: DOSBox debugger

Posted on 2023-03-29, 15:37

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by ripsaw8080

in DOSBox Development

in DOSBox Development

DOSBox emulates only the hardware that games use directly, otherwise it emulates at the BIOS level, so I guess you could say it's partly a high-level emulation. In any case, a real PC BIOS needs pretty much all of the hardware to be emulated, so loading one in DOSBox won't really work.

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Re: Was horizontal mouse movement in 2 pixel increments normal in the "old days"?

Posted on 2023-03-23, 04:34

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by ripsaw8080

in PC Emulation

in PC Emulation

It's not a question of what is "normal" or "supposed to be" but how a given application or game uses the mouse driver. It can easily happen with 320-width video modes (0x04, 0x05, 0x0D, 0x13) if care is not taken to avoid it. It's due to coordinate granularity applied by the driver, and I've seen …

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Re: Is it Possible to install a 1996, 3.5", 3 disk Generic CAD Program into DOSBox?

Posted on 2023-03-19, 19:35

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

Results can indeed depend on core/FPU type or platform, but in my tests on Windows with 0.74(-3) and SVN, the MCPDIAG conformance test has no failures with dyn_x86/dyn_fpu_dh and 35 failures out of over 900 Scale tests with normal core -- not what I would characterize as "lots of failed tests". As …

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Re: Lands of Lore - MIDI + Soudblaster?

Posted on 2023-03-16, 18:13

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by ripsaw8080

in Marvin \ Sound

in Marvin \ Sound

There's an official patch for it, which is described as "beta", probably meaning not well-tested, but works okay AFAIK. http://cd.textfiles.com/sprintos5/UPDATE/LOLSOUND.ZIP

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Re: DOSBox debugger

Posted on 2023-03-16, 13:16

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by ripsaw8080

in DOSBox Development

in DOSBox Development

The debugger causes changes to the memory layout for the programs running inside the emulated environment? Only when the DEBUG.COM launcher on the Z: drive is used, because it is a parent process that allocates memory blocks ahead of the launched child process. You can start debugging at the entry …

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Re: DOSBox game blaster emulation vs. SAAYM

Posted on 2023-03-06, 09:24

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by ripsaw8080

in DOSBox General

in DOSBox General

In my tests, pitch changes occur when the saa1099 sample generation rate does not match the mixing sample rate. After the clock rate changes committed in r4010, subsequent updating to the then-latest MAME sound cores introduced a difference in rates. The attached patch (experimental for now) appears …

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Re: DOSBox game blaster emulation vs. SAAYM

Posted on 2023-03-05, 18:15

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by ripsaw8080

in DOSBox General

in DOSBox General

Make sure to check with an SVN build, because I think the issue has been resolved there: [r4010]: Patch for SAA1099/Gameblaster emulation... (commited in r4010)

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Re: Several VESA video modes aren't working in DOS Box

Posted on 2023-02-21, 13:44

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by ripsaw8080

in DOSBox Development

in DOSBox Development

Hmm, I'm not sure it was suggested that mode 6Ah or 102h were not implemented or not working. VESA mode 102h is supported, of course, and must be set with INT 10h function 4F02h. Modes 69h (alias of mode 101h) and 6Ah (alias of mode 102h) are supported but must be set with INT 10h function 00h, not …

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Re: Indiana Jones and His Desktop Adventures for Win 3.11 gfx glitch

Posted on 2023-02-20, 05:11

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by ripsaw8080

in DOSBox Games/Apps

in DOSBox Games/Apps

It can depend on the S3 video driver you are using: 1.70.04 has the issue, 1.41B5 does not. I won't bore you with details except to say it's about the acceleration features the drivers try to use.

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Re: A program I've made works in VirtualBox and QEMU, but crashes under DosBox

Posted on 2023-01-07, 16:06

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by ripsaw8080

in DOSBox General

in DOSBox General

0ba45h masks the EFLAGS bits in AH to retain and the FPU condition flag bits in AL to merge. It takes advantage of the fact that the condition flags (carry, parity, zero) are in the same relative positions in both registers, which is almost certainly by design. Note that I didn't include the …

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