I've tried several decompilers but they didn't work, or wouldn't even compile. I looked at boomerang, Hopper, snowman, retdec, and reko. The ones that work wouldn't handle the architecture. The ghidra decompiler has been the only one that has proven useful. I haven't read enough about it to know how to save source code out of it but I can browse decompiled output which is at least the first step in reconstituting source code.

In a previous life, I wrote a z80 decompiler that used printf to format the output.  After a little whille futzing with assembler syntax, I changed it to produce output like

1132	*hl ?= '\n'

1133	if !== goto 1135

1134	hl++

1135	return

which made it easy for me to create c programs that did the same thing, modulo bugs.

if (*hl == '\n') {

    hl++
}

return

--dave

-- 
David Collier-Brown,         | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
davecb@spamcop.net           |                      -- Mark Twain