Ach was:
"Treasure Hunt works (apparently FBA can do encrypted z80, I'm just stupid lol)"
don't be so hard to your self, you are a genius. 
jens
I'm no genius lol, but I am certainly my own worst critic.
Thank you for the kind words Jens.
The generic tile rendering is the best thing I've written I think - makes things a lot easier!
Very much so! The tile decoding routines have certainly helped save me a lot of headaches.
FBA does support encrypted Z80 code - although it seems if it's quite a complicated encryption it has problems. The encryption on System 1 refuses to work reliably - I think the issue is in Doze somewhere but I'm not sure where!
Hmm.. I wonder... would it be possible to run the games in FBA and MAME, log the which operations they perform, and trace down exactly where they deviate? It may help nail down exactly which instruction(s) is/are the problem.
If you get that far, would it be possible fix the problem with reading/writing shorts from the read/write handlers? (22 / LD (nn), HL only reads the second byte).
