DOSBox is a DOS-emulator using SDL for easy portability to
different platforms, DOSBox has already been ported to
several different platforms, such as Windows, BeOS, Linux,
Mac OS X...

DOSBox emulates a 286/386 realmode CPU, Directory
FileSystem/XMS/EMS, a SoundBlaster card for excellent sound
compatibility with older games...

You can "re-live" the good old days with the help of
DOSBox, it can run plenty of the old classics that don't
run on your new computer !