Another option might be to compile for Z80 with FreePascal

This sounds interesting! Existing UNITs for Turbo Pascal 3 can be converted to Free Pascal?

Wysardry, geco, szipucsu: Maybe you should contact the author of TRSE:

https://lemonspawn.com/turbo-rascal-syntax-error-expected-but-begin/

TRSE is a multi-platform IDE that uses PASCAL-like language and can compile code to many retro computers. Has a very good compiler that puts out very optimized code. The author is more than willing to add support for new machines, current list is here:

https://lemonspawn.com/support-sheet/

There is an email on contact page. I do not know enough about Enterprise to be able to answer his questions (I already contacted him for some other systems), but I guess someone from here could be. Giving his previous dedication, support for Enterprise could be added probably in a week time.

I installed TRSE about a week ago, but haven't managed to find the time to try it out yet. The author seemed to think that it might be able to compile simple programs for the Enterprise using the custom platform options and that if it did he would be able to add better support fairly easily.

I've also been looking into what would be involved in adding the Enterprise as a target for FreePascal. One of the core coders at their forums seemed to think it would be possible for a beginner to do so using the documentation and the code for the other supported Z80 platforms (ZX Spectrum and MSX-DOS) as a guide.

It would be handy if the Enterprise was a target for both FreePascal and TRSE.

Does anyone know if HiSoft Pascal was ever officially released as freeware or public domain software? I've tried to contact HiSoft about obtaining it legally several times without getting a response.

Currently, FreePascal has very few optimisations for the Z80, but they will likely be added in the future if more retro enthusiasts start to use it.

On the other hand, TRSE doesn't really support modern architectures and I would like to create programs for both modern and retro platforms.

If both FreePascal and TRSE were able to target the Enterprise, I might be able to come up with a way to create code that could be compiled using either system with minimal changes.