Q: My program which uses floating-point math hangs on Windows DOS
box when I try to use FP emulation....
A: This is due to a bug in the emulator in DJGPP v2.02 and earlier.
The bug affected those programs running on Windows 3.X and 9X which use
the WAIT and FWAIT instructions (most of non-trivial FP
programs do), both those which use the emulator emu387.dxe and
those linked with the emulation library using the -lemu switch.
The bug is solved in DJGPP versions 2.03 and later, so upgrade.