PC Fortran (Was: Microsoft open sources GWBASIC

[Eric Smith]

On Sun, May 31, 2020 at 5:50 PM Bill Gunshannon via cctalk <
cctalk at classiccmp.org> wrote:

> On 5/31/20 2:24 AM, Eric Smith via cctalk wrote:
> >
> >
> > On the other hand, Intel also had a FORTRAN-80 product, which was
> unrelated
> > to Microsoft FORTRAN-80. Intel FOTRAN-80 ran on their MDS development
> > systems under the ISIS-II operating system, and the compiler was written
> in
> > PL/M.
> >
>
> Which is even funnier when you realize that the PL/M compiler
> was written in Fortran.
>

In at least the more recent versions, Intel FORTRAN-80 on ISIS-II was
compiled with the ISIS-II PL/M compiler, which was itself written in PL/M.

The ISIS-II PL/M compiler was bootstrapped from the PL/M cross-compiler
that was written in FORTRAN, and it's entirely possible that early versions
of Intel FORTRAN-80 were developed that way as well.