TPDD client:Teeny

"TEENY" is the tiniest "TPDD client" for Tandy and NEC portable computers.

There are several ways to ootstrap it on to the portable, depending on what kind of host computer and host "TPDD server" you have available.
The detailed directions vary. Here are just a few examples to start...

If your host pc is linux or macosx or freebsd or any *nix, you can use "dlplus" which is a tpdd server bundled with a few tpdd clients and a bootstrapping mechanism to get a client installed onto the portable.

https://github.com/bkw777/dlplus

git clone git@github.com:bkw777/dlplus.git
make clean all && sudo make install
dl -b

If your host pc is Windows, Mac, or Linux, you can run dlpluss's ancestor Desk-Link, using dosbox.

Get the file "dl-arc.exe" which is a self-extracting dos executable, and run it with dosbox.

That will unpack a bunch of files including both Desk-Link.COM and TEENY.EXE.

Run TEENY.EXE in dosbox and it will install teeny onto the portable.

You will need to give dosbox some command-line options to map COM1 inside dosbox to a serial device on the host pc.

For instance, on linux, with a usb-serial adapter plugged in:

mkdir /tmp/dlarc
cd /tmp/dlarc
wget http://ftp.whtech.com/club100/com/dl-arc.exe
dosbox -c "serial1 directserial realport:ttyUSB0" .
C:\>dl-arc
...
C:\>teeny