Now [mcuhacker] is working on bringing some of those memories back by getting a PC-XT emulator running on an ESP8266 ... 3.3 bootdisk image is stored in flash and is accessed as the A: drive.

The ESP8266 is a chip that turned a lot of heads recently, stuffing a WiFi radio, TCP/IP stack, and all the required bits to get a microcontroller on the Internet into a tiny, $5 module.