Hmmm...Now I remember...HP-95LX / 100LX / 200LX /
1000CX are CHEAP
PC-XTs running at 7 MHz that you can use in your pocket...and has a serial
interface :) I even have one myself! :D
THey also have kermit in ROM, Xmodem (I think) and plain ASCII capture
and upload. Oh, and a reasonable text editor.
The 95 just has TxD and RxD on the serial port, the 100 (and later
machines) have the flow control lines as well IIRC.
-tony