Following @mwenge's project to get Defender compiling ROM files that can be ran in MAME.
I would like to achieve the same thing for Joust from the source code which was also published under historicalsource/joust.
As I understand it the Joust arcade game used the same arcade cabinet hardware as Defender and even shares a sound ROM?
No idea how feasible this is, so far I've tried using the same tools asm6809 and vasm but there are some assembly instructions in the Joust source code that the do not recognise.