Here's some of the classic sub simulations I'm running under the newest version of Defend Reloaded and DosBox...
688 Attack Sub
Aces of the Deep with Expansion
DasBoot
Fast Attack
Gato
Red Storm Rising
Seawolf SSN-21
Silent Hunter Original
Silent Service 2
Sub Battle Simulator
UpPeriscope
Wolfpack
None of them give me any grief except for Seawolf. That's a software issue as it runs really good!
ChristopherT