John Smith wrote:
I could be wrong, and Roy will correct me if I am, but EZNEC seems to be
written in Visual Basic, or similar... might you need the run-time libraries
for an older edition?

No, that's not the problem -- it's due to DOS not being able to properly
determine the size of a large amount of RAM. And the DOS versions were
written with the MS BASIC Professional Development System, not Visual
Basic. Windows versions of EZNEC (v. 3.0 and 4.0) are written in Visual
Basic, except the calculating engines and a few speed-critical main
program routines which are written in Fortran.

And, he (Roy) mentions "double percision"--a nasty reality of basic (and
some Fortran compilers also), which seems to confirm my suspicions...

Double precision isn't a "nasty reality" -- it's simply a way of storing
floating point variables. Normal precision floating point variables are
stored in four byte words, and consequently have a resolution of about
seven significant decimal digits. Double precision variables require 8
bytes and have about 15 significant digits of resolution. Fortran
additionally has a complex data type which requires twice as much
storage space, since each variable of that type has two parts. Some
compilers have additional, higher precisions available. The program
author can choose which data type to use for each individual variable.

Roy Lewallen, W7EL