71B MultiMod: MEMORY LOST when changing batteries?

[Sylvain Cote]

(04-21-2021 03:54 PM)Dave Britten Wrote:  What does the 71B use to power the RAM while the batteries are removed? Is it a plain electrolytic cap, a "super-cap", or something else?

Look in the HP-71B Hardware Design Specification documentation, it should be there.

(04-21-2021 03:54 PM)Dave Britten Wrote:  Regarding IRAM, it's not possible to edit programs unless they're in main memory, right?

Wrong, you can create/modify/delete a file in RAM or in IRAM.

(04-21-2021 03:54 PM)Dave Britten Wrote:  Can you merge multiple RAM modules to create one big IRAM? (e.g. I have 3x 4K modules, can I use them as a single 12K IRAM?)

Merging is not done at the module level but at the chip level, that is how the FRAM71 module does it.