For some strange reason I personally love (artillery) games like that..
You can find the original Scorched Earth games for DOS here by the way:
Scorched Earth v1.2 (original game) Scorched Earth v1.5 (Improved Version)
You may need DOSBox (or similar) to run them in Windows by the way..
http://dosbox.sourceforge.net/news.php?show_news=1