PC Fortran (Was: Microsoft open sources GWBASIC

Eric Smith spacewar at gmail.com
Sun May 31 01:24:25 CDT 2020

On Sat, May 30, 2020 at 3:27 PM Fred Cisin via cctalk <cctalk at classiccmp.org>

> >> One reaason why you don't hear much about that is because the first
> >> version of Microsoft Fortran for the PC wasn't real great.
> >> It was written in Microsoft Pascal.
> On Sat, 30 May 2020, John Foust via cctalk wrote:
> > Really!
> > How does this connect to Microsoft's FORTRAN-80 for CP/M circa 1977?
> unrelated product, with no apparent connections, that I'm aware of.  The
> 8080/Z80 FORTRAN-80 would have been a better starting point!
> Bob Wallace wrote the original Microsoft Pascal; I don't know who wrote
> the Fortran, other than being told that it was written in Microsoft
> Pascal, and to avoid the run-time library.

I assume you mean that Microsoft Fortran for the PC was written in Pascal.

I did some reverse-engineering of the Microsoft FORTRAN-80 compiler, and it
appears to be hand-written in 8080 assembly.

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

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