We and others are working on emulators for the Burroughs B6700 too. If anyone can help find software for any of the Burroughs systems from that era, in particular the ESPOL compiler and the so-called INTRINSICS libraries it would be appreciated. Any software or documentation for Burroughs systems from that era would be helpful too, the related systems include Burroughs B6700, B7700, B6800, B7800, B6900, B5900 and B7900 (listed in order of release date). We may use later MCP revisions to help cross-compile to earlier versions or identify system related changes.
including Kildall's APL implementation (still needs to be proof read), but also note that Niklaus Wirth's programming language predecessor to Pascal known as Euler is there too.
Another interesting piece of source-code you will find there too is a Burroughs B6500 emulator, B6500 MCP and B6500 ESPOL compiler written for the B5500. The B5500 was used by Burroughs as the development platform for the B6500 which was the follow-on from the B5000 family.
http://www.phkimpel.us/B5500/