FYI, I created a web-based demo, in Rust/Yew, to recreate a project I built back in the late 1970s using an RCA CDP1802 board kit I purchased mail order from the back of a computer magazine.
I used a resistor capacitor delay circuit for each axis of a joystick and hand assembled code to strobe the two circuits and count the cycles before the circuit “echoed” a edge, and then positioned the “ball” pixel on the attached B&W TV set (RF modulator attached).
The system only had 256 bytes of RAM, and the video chip used all of that for the video buffer (so the code appears as pixels on the screen). Just wanted to share this fun project. Note resolution: 4 pixels per bit!