Since #SoloForth won't play along with the #DivMMC expansion on my #harlequin128k, I tried some of the various #Forth compilers for the #ZXSpectrum and eventually found #ZXForth also known as #SpectrumForth - I run a patched version of the original program once released by #ArcticComputing which now supports #trdos #betadisk

The patched version with TR-DOS support can be downloaded here:

https://zxart.ee/eng/software/system-software/programming/jazyki-programmirovanija/zx-forth1/zx-forth1/