this was part of some research I did when i turned up the reference manual from mascor, ca. 1970, which is the missing link between IBM ACS and the ACS engineers that went to Amdahl.

http://bitsavers.org/pdf/mascor

it was one of several large computer startups that failed in the 1970 recession

Thanks for doing what you do, by the way. Your site is one of the few remaining points of record for interesting older documents like this.