I picked up a couple of TRS-80 Model 100 (M100)
laptops a couple of years ago, and dusted them off again just
recently. I have never been a fan of Microsoft, but I will give
credit where it is due. Bill Gates and his team did a remarkable
job on this box. When it came out, and for years afterward, it
was a truly kick-ass machine. It's still a hoot to tinker with,
If you're sitting in front of a 3 GHz quad-core with 2 GB of RAM, or
reading this on a 400 MHz PDA with Bluetooth and WiFi, you may be
chuckling about a machine with 32 KB (yes, kilobytes) of RAM and a
clock speed of 2.4 MHz (yes, megahertz). But if you're really
into embedded control and if you like to get your hands dirty in the
innards of a well-designed machine, I doubt you'll find anything better.
I'll skip the obligatory list of features and options; you can do a
search for "TRS-80 model 100"
and find lots of pages
filled with that stuff. Two pages I've found especially helpful
and Ira Goldklang's TRS-80 Revived Site.