I have an old program that doesn't seem to get along with the mouse driver in DOSBox. While the mouse does work, any and all cursor movement causes corruption on the screen. This is probably due to some adverse interaction between the mouse driver and the program's own video driver. I decided to create a bootable disk image (DOS 5, which apparently disables the DOSBox mouse), loading Ctmouse.exe in the autoexec.bat. The program in question does not recognize the mouse, as I think it predates PS2 and is looking only for a serial mouse. An escape back to DOS 5 within the same DOSBox session verifies that the mouse driver is indeed loaded properly, as it works fine in "EDIT.EXE." I thought I might find an answer by playing around with the [serial] section of DOSBox.conf, but I'm not quite sure how to determine "realport," IRQ, and the exact syntax in general. Can anyone shed some light? Thanks in advance.