Thanks for the link. A good source code is worth 10 bits of documentation. Must take a lot of memory to store those tiles if they are pre-shifted. Mike Lamb was a very clever guy.

TBC I don't know how Robocop scrolls. I'm not a Spectrum guy so I'll be of limited use apart from links :)TBC I don't know how Robocop scrolls. I'm not a Spectrum guy so I'll be of limited use apart from links :)