[TUHS] What would early alternatives to C have been?

[John Levine]

It appears that Luther Johnson <luther.johnson at makerlisp.com> said:
>I believe CP/M was written entirely in 8080 assembly language. PL/M was
>a PL/1 subset, I think Gary Kildall was the main programmer behind that,
>and I'm sure there was a version for CP/M, but I doubt CP/M was written
>in it, ...

See this Wikipedia article on PL/M, which summarizes the history that
Kildall wrote up in a 1993 manuscript now online at the CHM. If he
says he wrote it in PL/M I am inclined to believe him.

https://en.wikipedia.org/wiki/PL/M#CITEREFKildall1993

R's,
John