HP 9100A/B: Effects of AC power interruption?

[Kiwi Engr]

In the 9100A/B support and public-facing document describing the design and operation, much is made of the non-volatility of the coincident-current magnetic core memory. The core memory retains the program steps, the X, Y, and Z registers, and the storage registers (1-9, and in the B also - 1 to 9, a to f), even after the machine's power is turned off or otherwise interrupted, and indeed will retain this data indefinitely. Moreover, when the power is turned on, the state of these locations is the same as before the power went down. Have I understood all of that correctly?

Is anything else relating to the core memory also stored and recalled? E.g., Error state, carry flag, zero flag, sign flag for the last or current ALU operation?

What happens if a program is running when the power is switched off? When the power is restored, can the program continue automatically, or must it be continued manually by pressing RUN, or must the program be restarted? Is there a risk to data integrity if I cycle the power? Is there power-fail detector hardware in the calculator that hurriedly saves additional status flags before the power fully drains away? How reliable is the storage of machine state across power outages?

Lots of questions! ;-) However, inquiring minds need to know. I may have most of the 9100 documentation but no physical 9100 working or non-working. However, despite searching, I've been unable to find much more than non-volatile memory is a valuable calculator feature.

Are these issues discussed in any of the support documentation? One place I looked at that showed some promise but did not discuss this was the "Pseudo-Hardware Problems" list in the official service manual.