For a while I used Turbo Basic under MS-DOS. It was
an
incredible development environment... for a BASIC ... running
under MS-DOS... Ok, so it was "passable." Still :)
I hear that DEC BASIC is good, too.
Both of the above examples are compilers, though, I think.
While it's possible that DEC BASIC was an early adopter
of incremental compilation techniques, I don't think so...
I'm pretty sure DEC BASIC is a simple interpreter. I guess
I should look at the source...
-dq