forums.jaspp.org.uk

I was in touch with Merlyn Kline (Minerva) a while ago. Maybe you could try contacting him: http://www.binary.co.uk/binary.html

I vaguely remember talking to someone on the comp.emulators.misc newsgroup in the early 1990s who claimed to have done ports of Rocket Raid and some other titles, apparently automating the process by doing 6502 to ARM code translation. They said that they had shown the ports to Superior Software to ...

Both stardot and Retro Software seem to run phpBB without obvious problems. Maybe ask the admins there for some advice.

In case you've not already managed to get in touch with him, you might want to try asking the people at the Raspberry Pi Foundation since he's apparently involved with that.