Deep Blue C

Deep Blue C is a compiler for a subset of the C programming language for the Atari 8-bit family distributed by the Atari Program Exchange (APX). The compiler is a version of Ron Cain's public domain Small-C modified by John Howard Palevich to run on the Atari computer hardware. Palevich also wrote the Atari 8-bit game "Dandy" for APX. The syntax supported by "Deep Blue C" is close to that of ANSI C with significant limitations. The compiler creates binary code for Intel 8080 processor which is then executed by an 8080 virtual machine.
The source code to the compiler was sold by APX as "Deep Blue Secrets".
Limitations.
The following language constructs are not supported:
Other non-standard properties of Deep Blue C:
Sample program.
This program prints "Hello World!":
 main()
 printf("Hello World!");