Hi B9, Joshua, Brian, and Steve, The various options you provided are all of interest and very much appreciated. I do want a WiFi interface (if it works) because there are a bunch of other ancient systems that it would be useful to use it with, including some S-100 boat anchors; Osborne 1, Kaypro 2, and Commodore SX-64 luggables; a TRS-80 4P; a Mac Portable among many other Macs; PCs of every vintage (DOS, Windows, Linus, etc.); and so forth.
A WiFi interface also means easy one-to-many (non-simultaneous) connections are possible without changing physical connections. Obviously, I would need a converter for each ancient system that I want to connect at one time, but this is mostly for occasional file transfers and logins to perform configurations, etc., so one or two will probably be enough. The ESP-based option sounds really interesting, too, and I'd be interested in that when it's working. OK, now I just need to go on GoFundMe to acquire funding, since I teach STEM, including computing and robotics, in high schools and community colleges in non-union districts with no tenure offered. I use ancient systems to teach computing fundamentals because they're comprehendible by mere mortals down to the bit level, while I'd challenge anyone here to explain how _everything_ works at the bit-level, system-wide, in today's systems. It's sort of like how no one person has everything needed to manufacture even a No. 2 wooden graphite pencil at industry-standard level standards of quality today. The metal ferrule alone that holds the eraser on is a marvel of modern manufacturing, much less the chemistry needed to manufacture the paint (in at least two colors), the purification and compression of carbon into graphite in a long, thin cylinder in one piece, etc. Since no one else seems to have done a data-driven study on rechargeable batteries in the M-100, I'll do so for those batteries I do have. However, it's not going to be anywhere near-inclusive of every product on the market unless I get donations to do so! Thanks again and All the Best, Jim KJ7JHE
