Writing a (dis-)assembler for 8-bit code in D - blog posts

[Dukc]

You remember Brian Callahan, the one who finished OpenBSD support 
for the D language? He has more posts that I think people here 
might find interesting. He has written a disassembler and an 
assembler for a Z80 processor in D.

The main point in his articles is seemingly to demonstrate how 
programs behave, choice of the language is an implementation 
detail. His D is still rough, as it is for anyone new to the 
language, but he knows a lot about low-level programming in 
general. If you're thinking about low-level programming or 
compiler technology, these are worth a look.

https://briancallahan.net/blog/archive.html