Try disabling EMS usage in the game.

Try loadfix too.

PS: Related to this issue, in the function Bitu DmaChannel::Read, line 288, (which hits if want >= left) should this line read a […]
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PS: Related to this issue, in the function Bitu DmaChannel::Read, line 288, (which hits if want >= left) should this line read as

DMA_BlockRead(pagebase,curraddr,buffer,left,DMA16);

rather than

DMA_BlockRead(pagebase,curraddr,buffer,want,DMA16);

Does that game actually hit the want>left case? As want==left should be the maximum
glancing at the calling code, but not sure.

In dma.cpp, DMA_Init() change the call to DMA_SetWrapping(0xffffffff);
(disables wrapping so simulates an emm386 bug). Does this fix anything?

Does that game actually hit the want>left case? As want==left should be the maximum
glancing at the calling code, but not sure.

You're right, the game never hits the want > left case.

In dma.cpp, DMA_Init() change the call to DMA_SetWrapping(0xffffffff);
(disables wrapping so simulates an emm386 bug). Does this fix anything?

Yes it does - Sherlock Holmes/Serrated Scalpel doesn't cause the error anymore. As an aside, I should mention Sherlock Holmes/Serrated Scalpel was released in 1992.

Yes it does - Sherlock Holmes/Serrated Scalpel doesn't cause the error anymore.

"Error" means the audio distortions (occational popping)?

"Error" means the audio distortions (occational popping)?

Yes, no more audio distortions.

Thanks for checking this out!

I've got an issue vaguely related to this bug, maybe I can ask for quick help here? Or should I repost it in a new thread?

I've got a game that causes the same bug (EOL!), and I'm trying to compile dosbox with the above fixes, but I'm a total beginner in this stuff. I've followed that guide so far http://www.dosbox.com/wiki/BuildingDOSBox

I've gotten to the point where it says "After compiling you'll need to adjust the PATH variable to point at the directory where the freshly built SDL-Library can be found.",

but I've got no clue where to find that PATH variable I have to change. Can someone help me out here?

What game, what OS, what dosbox version you tried, what compiler, what exact error message etc.

The error is the same as above DMA segbound wrapping (read) with DOSBox 0.74 for Windows (using XP). The game is EOL! by Family Production, the error only appears with certain sound effects. For the compiler I followed that tutorial, getting MingW and (the last full package version of) MSYS (1.0.11).

EDIT:

OK, I now noticed that the step that kept me puzzling wasn't neccessary at all (maybe that needs clarifying in the guide...). Could compile DOSBox now, game works fine with the above fixes.

Having similar problem - game plays fine with digital sound until I try to enter the chemist, when the sound pops and then repeats and the game freezes. Could not find any file that you dudes mentioned, would love to fix this so I can finish the game!!

Also experiencing this problem. Exits at end of first digital sound effect - of the bottle breaking when the cat knocks it off the crate at the beginning of the introduction.

Tried loadfix, but just ran it and it told me that it allocated 64kB. Not sure if I'm supposed to do something else with it. Too much base memory doesn't appear to be the issue, though.

Turned off Expanded memory usage in the install program.

Neither of those steps (nor the combination of the two) helped.

Am I correct in my understanding that the only fix for this (as of 0.74) is to patch the source code and recompile?

Thanks,
DM

Try a less round number with loadfix than 64 ("round" in powers of 2, that is), e.g. loadfix -26, and you'll get further in the intro. You will still encounter wrapping at some point in the game, though, so the problem is only reduced in this case. It at least demonstrates that the DMA buffer location in memory relative to the load address has an effect on the issue.

In 0.74 (and current source) the only way to prevent the problem is to change the source and recompile. You can, of course, run the game in 0.73, which does not have the error exit for DMA wrapping; but you may get some pops in the audio or other undesirable side-effects of the wrapping.

I had a similar problem when running v 0.74 on Win7 with this game. after running only game.exe, it comes later in the game that it will completely freeze when entering the Chemist.
I had to download and run through 0.73 to bypass this. Sorted! 😁
I panicked when it first froze because this game is so nostaligic and I just wanted to play it all the way to the end again.
But voila, downloading v0.73 worked for me.

I had to download it from http://www.fileplanet.com/170717/170000/fileinfo/DOSBox-v.73

I wish the DOSBOX website would give option to download previous versions, but this download from FilePlanet is pretty trustworthy to me!

melissamortiis wrote:

I wish the DOSBOX website would give option to download previous versions

There's a link to "old dosbox versions" on the downloads page - guess you missed it?