PENGUIN is a keyboard interface for the ZX Spectrum. It supplies the Spectrum with an additional port to connect PC AT-keyboards. It works with Spectrum 16k, 48k and 48k+. Mainly it is thought for using on Rubber-key Spectrums.
With an AT/USB Adapter even USB-keyboards can get connected. Such an adapter is not included, but you can still buy it. But still not every keyboard might work, there are differences which makes it incompabtible. However, as easier the keyboards is, as better the chance that it will work.
CAUTION: When the PENGUIN is connected, you cannot use the normal Spectrum keyboard.
The interface will be connected to the Spectrum rear port, there are no changes of the hardware needed.