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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, ...
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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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