thanks all. In 1976, at udel, we thought it meant c runtime startoff and that seems to be a reasonable interpretation. 

Kind of nice that a very new system, oreboot, will have a bt0 performing about the same function :-)

On Mon, Jun 12, 2023 at 10:28 PM Dave Horsfall <dave@horsfall.org> wrote:
On Mon, 12 Jun 2023, Clem Cole wrote:

> > I've always thought of it as "C run time stage 0".
>
> crt - C RunTme.   I always heard it expressed as C  runtime SYSTEM or
> START

Ah; well, I was almost right :-)  It's been a while since I was using
Ed 5 where I first saw that comment...

-- Dave