Manx Aztec C86 5.2A (11-26-1992)
Released 11/26/1992 by Manx Software Systems
For DOS

Aztec C is a fast and efficient C language compiler that produced 
compact, fast code. Its featured support for many platforms including 
MS-DOS, Apple II DOS 3.3 and ProDOS, Commodore 64, Macintosh, 
CP/M-80, CP/M-86, TRS-80, Amiga, and Atari ST. Cross compiler hosts 
also included VMS and Unix. It competed against Microsoft C, Apple 
MPW C, Lattice C, and many others.