PC keyboard to Sinclair ZX Spectrum

From Petr Sladek

How to connect an ordinary PC keyboard with a PS/2 mini-DIN connector or a USB connector to a vintage 8-bit computer Sinclair ZX Spectrum? There are many projects with this aim.

• IMAR-3 PC-KEYBOARD ADAPTER FOR SPECTRUM
• Yet Another ZX-Spectrum AT Keyboard Interface (YAZSAKI)