10
It's hard to be completely certain without knowing a model number, but it strikes me as extremely unlikely.
Casio's first data bank device (of which I'm aware, anyway) was the PF-3000, which they started selling around 1983. At least as I read things, this is saying a realistic capacity is names and numbers for around 50-60 people (with a theoretical maximum ...
9
JackSprat was a tool produced by a company called Brayder, used to remove portions of the original ROM images. It used to produce a ROM backup along with a PRC which could be used to restore it; you can still find the original manual on the Internet Archive's copy of Brayder's technical support page.
Without that ROM backup and the associated restore PRC, ...
5
The problem is the HTTPS today. There is a huge push to migrate off of HTTP and on to HTTPS. But older machines simply can't do the necessary encryption in time.
But much of this can be mitigate off-device by routing through a proxy that takes HTTP traffic on one side (device side), and talks HTTPS out the other (internet side). It's not drag and drop, but ...
4
For web pages, you can use the Web rendereing proxy, displaying modern web pages inside a GIF and imagemap. It works well, though Google Captcha often thinks (rightfully) that it is not a human controlling the web browser and won't let you through.
For pretty much anything else, you can try to locate a VNC client for your platform, There are clients even for ...
4
iFixit has a (user-contributed) guide on this subject. The Zire battery appears to be a standard 3.7volt 600mAh Lithium-Ion unit, probably originating from cell phones. Amazon shows several non-OEM replacements available.
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