On Mon, 22 Jun 2026, Paul Koning via cctalk wrote:
On Sat, 20 Jun 2026, ben via cctalk wrote:
PL/1 and C are the only two high level languages a operating system is written
in, that I can think of that are well documented, and easily found on the WEB.
That clearly is not even close to true. There is ALGOL (or rather its
dialect ESPOL) used by Burroughs. There's CYBIL, used by CDC. There's
BLISS, used by DEC. And if you include embedded RTOS, there's FORTH.
Just a couple I can think of in 30 seconds.
Did anyone use FORTRAN? I do remember IBM wrote the OS/360 FORTRAN (H)
compiler in FORTRAN.
Prime computers were in FORTRAN.
Then there are many university projects - e.g. Edinburgh used Imp77.
Oxford used BCPL (OS6), UCSD Pascal, ...
Gordon
