The compiler was used on the Countess to produce a version for the CDC 1604, and later self-compiled on that machine. Many other versions were produced for commercial computers such as the UNIVAC 1107, 490, and 418, and the IBM 704 and 709. The production version of NELIAC was a second generation system (for the AN/USQ-20, a modernized and militarized version of the AN/USQ-20), compiled by the first version, but including full decoding of algorithmic expressions and, later, an input/output (I/O) system missing on all other versions.