I am trying to run a DOS application in DosBox 0.74, running on Microsoft Windows XP Home Edition, Version 2002, Service Pack 3. The program is Joan Riff's Z80mu from ComputerWise Consulting Services, 1986. The program is an emulator for a Z80 computer with CP/M services provided by the emulator.

The program is probably trying to get keyboard input via direct BIOS calls. When the DosBox command processor is running, the 'Enter' key works normally. While Z80MU is running I have to type control-J instead of the 'Enter' key to end each line. Exiting from Z80mu back to DosBox returns the 'Enter' key to normal (for DosBox)

I didn't see anything like this in the set-up readme, FAQ, etc. Is this a known problem (with a known cure in the keyboard set-up, etc.), or am I just lucky to have come up with a new way of abusing DosBox 😉 ?