USB Keyboard I got some spare time and I mapped the USB keyboard keys to map correctly* to the C64, you can write programs in BASIC like...

Last year I made a Sinclair Spectrum from scratch on the S7 Retro Board (actually was on a Zed Board which is out of reach for many hobby...

Below is a full project and Youtube video on how to design a shift register and display the state of the bits on the 8 LEDs on the board....