Yes, I did early development on both. At least the interface to the OS was Pascal. I still have the early documentation buried in a box somewhere.
Sent from my iPhone > On Jun 20, 2026, at 2:02 PM, Fred Cisin via cctalk <[email protected]> > 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. > > I heard that all of the Lisa OS, and much of Macintosh, were written in > Pascal. (obviously other than some low-level drivers and performance critical > routines?) > Is that correct? > > http://pascal.hansotten.com/apple-lisa-pascal/ > > When did Macintosh development switch to C? > > -- > Grumpy Ol' Fred [email protected]
