Thanks for the responses. I did see the Hackaday project to build a Bubble Seed Module, but it was for a SBC-85 board. Evidently, HP built or had built their own module. Volume I of the service manual shows a (grainy on my copy) photo of the device. You plug it in and run Test Routine 169.
Ed, the Boot Loop routine you referred to can be run with loading a program from the manual with a HP-1B controller. Maybe, that is all I need. The program would have to be hand typed in, and I'd have to find a way to emulate the controller. I have a Prologix USP Controller. I'll have to figure out how to use it.
The history of Bubble Memory is interesting. Turned out to be a blind alley, but it was a creative idea.
Thanks again,
John
