Ah! Success. I can't get it to auto-boot, possibly this is some configuration problem with the emulator, but *EXEC !BOOT causes it to run, and entering the command D draws a picture of a board (attached).
I don't mind testing
I've got a BBC in storage waiting to be revived, so any learning I can get the better. I just wish I could get the stack of BBC manuals I have out of storage so I could understand things more! Perhaps I will need to look to see if some scoundrel has uploaded a PDF
I do appreciate how much effort it takes to write software for the old 8-bits, there's always the 3-way stretch on functionality, speed and memory usage!