I came across this when searching for information on Forth compilers for the Spectrum. Not sure if it's of use to anyone:
http://programandala.net/en.program.abersoft_forth.html
https://github.com/programandala-net/abersoft-forth
Abersoft Forth Disassembled
Re: Abersoft Forth Disassembled
i also want to admit that my dsForth is based on decompiled AberForth too (yet it is heavily modified, sped up, and extended with a lot of features).