No, this is NOT the TRS-80...
In the late 1970s, perhaps early 80s too, Radio Shack sold a sort of computer trainer kit. It had a hex keyboard and its output was primarily through a grid of LEDs on a raised stand.
I seem to recall this was also sold through other companies.
Does anyone recall this? My google-fu is failing me.
UPDATE: Lengthier description:
- the base was white and had a hex keypad. I believe it also had one or two 7-segment LED displays.
- at the back of the base were two black plastic cylinders rising vertically a couple of inches
- on top of the two cylinders was the "display area". among other things, in the center was a grid of conventional red LED lights, 4x4 IIRC, or perhaps 3x3.
- I recall playing a pong-like game on on the LED grid. It had a known bug that would sometimes lead to it looping the ball between two positions forever.