For me the weirdness with the mouse occurs in windowed mode as well as fullscreen, and depends on how fast I move the mouse. When moving the mouse quickly there is little difference; but when moving the mouse very slowly the pointer will actually not move to the right or down at all. The behavior is the same when using mouse drivers instead of DOSBox's internal driver, so I suspect this is a quirk of the game's design.

I analyzed the issue awhile ago when it was reported, and learned of a way to work around it. Place the attached program in the game directory and run it instead of A10.COM, then the strange behavior should stop, but the way the game moves the mouse pointer (like it "gravitates") to certain buttons when changing screens should still work correctly. Assembly source is included in the archive.

Edit: Updated the fix program to add support for the CD version.

Other than snapping to the first button after the game loads, the mouse behaves normally for me. It may be that I have a later version of the game where this has already been addressed. I believe that the behavior is linked to the fact that Dynamix often designed their games of this era to be playable without a mouse, where the keyboard cursor keys can move the cursor from button to button.

It's v1.5 that has the issue, not v1.0; their programming is different, although they do share the gravitating mouse pointer behavior. The last couple of screenshots at Mobygames are the title and menu screens of v1.5, which are distinctly different than those of v1.0.

I know that he is talking about 1.5, as was I. I know the difference, I have both in addition to the CD with A-10 v 1.5 and Red Baron. The behavior does not occur for me with 1.5 (nor version 1, but that is moot since he was talking about 1.5.)

Did you mean for your fix to be a TSR? The game does not start from A10FIX.COM, neither with the floppy version or the CD.

The fix program executes A10.COM, so you apparently don't have that file in your version. The fix would mostly likely have no effect if the game executables are different; and since you say the pointer is not sluggish for you when slowly moving the mouse right or down, the fix would for that reason also have no apparent effect.

It did run better with the fix (for the floppy version; won't work with CD), but something I also noticed (which happened prior to and after the fix) is sometimes the game won't respond to left mouse clicks (I'll click a menu button, and the button graphic will change to a pressed button but will do nothing more), yet right mouse clicks still work..

But the sluggishness when moving right/down is gone at least..

I have noticed that mouse movement in Dynamix games in general is somewhat sluggish, and any of their games that give you the option to turn up sensitivity I always take full advantage of.

DOSBox has its own mouse sensitivity setting; doesn't that help with sluggish mouse movement in the games you refer to?

BTW, if you have autolock=false in your DOSBox config, you won't experience sluggish mouse pointer movment in windowed mode until you lock the mouse with ctrl-f10.

I replaced the fix program with one that adds support for the CD version of the game. If you renamed GCD.COM to A10.COM to try to get the previous fix program to work, then rename the file back the way it was, because the filename is used to determine the version.

Ok thanks. The sensitivity setting does help, I was just mention that many Dynamix games by default have somewhat sluggish mouse movement. Anyway thanks again for all the help.