[Gremlin]

Below is the spec I just found of the thing.

Radio Shack TRS-80 Model III
Introduced: July 1980
Price: US $699 base model
US $2495 w/ 32K, dual drives.
CPU: Zilog Z-80, 2.03 MHz
RAM: 4K, 48K max.
Ports: Cassette tape, expansion, serial
Display: 12-inch B/W monitor: 64 X 16 text
Strorage: 0, 1, or 2 internal 178K floppy drives
External cassette @ 500 / 1500 baud
OS: BASIC in ROM, TRS-DOS on disk

I gave it to a youngster to play around on years ago and wish I had it today.
Tandy also made a portable PC with a five inch screen and two 3.5 floppy disks.
It had a built in telephone modem. Like waiting for Christmas if you got a connection. I sold that for a tenner, wish I still had that also.
probably get a fiver for them both but they were fun.