Quote from the readme file:
Scorched Earth 1.5 was written using Borland C++ 4.0 and Turbo Assembler 3.0. There are approximately 122 C/C++ files and 3 assembly files, totalling over 785K of source code. Scanned mountain ranges were processed with Adobe Photoshop.
The game features AI text messages (e.g. "I shall smash your ugly tank!"), these are both read from plain text files (TALK1.CFG and TALK2.CFG), users can change and translate these files freely.