The situation on that series is a little better than most of the Burroughs machines. CHM has a not-quite last generation machine (19xx) as does William Donzelli. Some software came with the CHM machine, I went to one of the last guys who took care of them in TN a few years ago and brought back a large stash of maint docs/sw and a card set from a 19xx he had in storage. Since there are a lot of B-1xxx alums in the Bay Area, there is some possiblity the CHM machine could be restored. A hardware simulation of the machine would be a challenge. Unfortunately, there were lots of interesting software/langs for the machine, and almost nothing has survived that I've been able to find. Same is true for the B5xxx/B6xxx etc. series. Univac and Burroughs had a scorched earth policy and almost nothing survives today from their old machines.