I have been running a full IBM System/370 Mainframe on a $20 Raspberry Pi Zero for ~5 months. Thousands of lines of COBOL and HLASM running flawless. Tested an entire bank’s mainframe COBOL on it.
They state on a Raspberry Pi Zero it is rather slow but it’s possible to run it on a faster Pi or another Linux system. The software is possible due to tk4- and KICKS for TSO. It even runs Colossal Cave:
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Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.