It had largely Lisp-like
semantics and
ALGOL 60-like
syntax. It is remembered mostly for its syntax, yet it had many features beyond those of early Lisps. Early Lisps had many limits, including limited data types and slow numerics. Its use of fully parenthesized notation was also considered a problem. The inventor of Lisp,
John McCarthy, expected these issues to be addressed in a later version, called notionally Lisp 2. Hence the name Lisp 1.5 for the successor to the earliest Lisp. Lisp 2 was a joint project of the
System Development Corporation and
Information International, Inc., and was intended for the
IBM built
AN/FSQ-32 military computer. Development later shifted to the
IBM 360/67 and the
Digital Equipment Corporation PDP-6. The project was eventually abandoned. ==Bibliography==