Clarification: The Apollo computer series by Apollo Domain is meant here, not the Apollo space mission, just to be sure. The Pascal-based operating system is A

Clarification: The Apollo computer series by Apollo Domain is meant here, not the Apollo space mission, just to be sure. The Pascal-based operating system is Aegis (later DomainOS), which - with UNIX - is a joint precursor of HP-UX: https://en.wikipedia.org/wiki/Domain/OS#AEGIS https://en.wikipedia.org/wiki/Domain/OS#AEGIS .