This makes sense since there was B runtime to start, and Dennis was messing with things. No idea but I wonder if that was the impetus for the rename from B to newB to C - when he introduced a new runtime?

On Mon, Jun 12, 2023 at 2:30 PM Dan Cross <crossd@gmail.com> wrote:

On Mon, Jun 12, 2023 at 2:22 PM ron minnich <rminnich@gmail.com> wrote:
> This came up lately in the riscv firmware universe. Someone named early boot bt0, I mentioned crt0, and ... when did that name first appear? I first saw it in v6 but I'm sure it was long before.

The Unix tree shows it in 2nd Edition:
https://www.tuhs.org/cgi-bin/utree.pl?file=V2/lib/crt0.s
That would suggest it was more or less contemporaneous with C itself.

- Dan C.