Hello David,

> On 29 Jan 2022, at 11:14, dmainprice via Fortran <fortran@gcc.gnu.org> wrote:

> gfortran  run on 64bit Mac ?

Yes, gfortran has been running on (x86_64) 64bit Mac since macOS 10.6.

> Any suggestions will F77 code run ?

if it will compile with gfortran, then you could expect it to run,

cheers
Iain

> 
> all the best and happy year
> 
> David Mainprice 
> 
> 

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