Human Interface Devices and the advanced ZX Spectrum.
Taken things more seriously, 40 keys should not be enough...
Sam Coupe provides PC-XT like keyboard with 72 keys, on ports 254 and 249, Orel BK-08 has 67 keys on extended port 254.
Currently there are several convertors-interfaces available when you want to connect PS/2 and USB keyboards to the ZX Spectrum. The MB03+ Ultimate interface and the eLeMeNt ZX computer overtook the ZX-Uno ports KEYSTAT adn KEYCODE to read every key on a PC keyboard attached.
This is an improved version of the old Kempston mouse.
This interface features
- standard PC mouse with USB or PS/2 connectors
- mouse-wheel and up to 4-buttons support
- additional connector for Amiga mouse and Kempston joystick
- reset button
- special Master/Slave mode setting for 2 interfaces connected together
Internal version for the CPU slot is also avaiable.
For the manual and software support look at the website of Velesoft.