Here's the idea:
Run Arduino Basic on a ATmega8 (will need to tweak the code to make it use less RAM and Flash, will start do soon)
Make a tiny terminal with this:
- ATtiny85 using the internal 8Mhz clock
- PS2 keyboard connector (2 wires)
- 16x2 LCD using a C164 or C595 shifter (2 wires)
- I2C or UART connection to the main board above (2 wires)
This is to teach kids the startup of robotics/microelectronics. And they are mostly poor, so, no computer, no expensive stuff.