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There were different implementations of TECO (written in the assembly languages of different machines) that had different user interfaces. That does not in any way imply that TECO had an editor process using a defined protocol to communicate with its UI process; in fact, in 1964, TECO ran on two computers, and neither of them had separate processes, or an operating system to run them under. ITS development hadn't started yet.

As far as I know, all the implementations of TECO, even today, glom the screen update logic (if any!) together with the editor-buffer logic in a single monolithic process.

> one of the first

vs

> the first

But cool anyway. Maybe we should see how TECO manages its data too.

TIL about punch card hot code swapping

It is reputed that someone wrote a Fortran compiler in TECO on a dare.

Ah, TECO. I still have some muscle memory of TECO on the PDP-10. Line noise indeed.