There's a couple of issues though, the //c did not run off battery power, so you'd need a long cord, and the LCD was terrible, I don't think you'd be able to read it in direct sunlight. But if you have a long phone cable to go with the power cord, maybe you could have sent a fax? Or at least a telex.
https://www.youtube.com/watch?v=2HwmO_GZfzI
It's the professional version with the Big Boy keyboard, and it's running some silly BASIC program printing out text in a loop.
10.5kg becomes heavy very quickly, especially because of its awkward shape.
It was "luggable" (a cinderblock away from being "portable".)
FTFY
The last time I saw it was about five years ago, and it was in absolutely mint condition, even though he keeps it under a tarp with a bunch of junk in a barn.
For decades he kept promising to send it to me since he has no use for it. Recently that changed to "I'm gonna use it some day" so I no longer have any hope of getting my hands on it.
It got 16 hours of runtime on four AA batteries.
Way before my time, but I got to play around with one in 2000 and really liked the form factor.
There were also glorified calculators like the 1980 TRS-80 PC-1 (https://www.old-computers.com/museum/computer.asp?c=937&st=1). Never used that particular model, but that style of keyboard/display in a palmtop computer is not very ergonomic IMO.
There is a list of 1980s portables on Wikipedia: https://en.wikipedia.org/wiki/Timeline_of_portable_computers
That list may look long, but it is probably far from complete. For example, at the 2017 VCF PNW I got to play with a 1980s "glorified calculator" Lisp machine handheld. Can't remember the manufacturer, but it is definitely not on that list, and the only reference I was able to find with a quick web search was this: https://en.wikipedia.org/wiki/Talk:Lisp_machine#Sony_and_Lis...
So there were a lot more portable computers around in the 1980s than you suspect.
The closest thing we had to wireless networking was infrared serial to either other devices or a computer. It generally didn't work well.
There were a few good network apps for IRC, newsgroups, and even a few limited web browsers.
With Newton OS 2.x people got WaveLAN (pre-standard) and later a few 802.11b PCMCIA cards working. It was all a complete pain in the ass and only the most dedicated Newton fans even bothered.
It was a great demonstration in a coffee shop - although, you would be able to watch the battery drain in real-time.
[0]https://web.archive.org/web/19970124002055/http://digitaloce...
Later versions of the OS (2.1 for sure, and I think 2.0 could run a few specific Ethernet cards) had Ethernet (10Base-T, and technically 10Base2 I think) and Wifi (802.11b only) drivers written for them.
When I first joined the Newton team the hardware guys were testing a spread-spectrum network that supported roaming devices with automatic discovery and connection. At that point all the working Newton hardware was big clunky naked circuit boards, so they tested them by ribbon-cabling them to Macintosh SEs that they wheeled around on carts to go from one network to another.
(I'd argue that background syncing over WiFi or cellular networks is also a reason why Podcasting 2.0 is a lot bigger than Podcasting 1.0 was.)