New features and extras for pico-zxspectrum
Here are some updates to fruit-bat's pico-zxspectrum I've added the ability to use a real ZX Spectrum Keyboard with the Pico Spectrum Emulator.
All keys are fully functional and the Emulator Menus can only be accessed via an external button connected to one of the GPIO pins. The Menu can be navigated using the Spectrum's keyboard number keys. There are an extra 8 external buttons that can been used for setting the Spectrum ROM boot mode and a Joystick Keyboard.
Please see the Schematic diagram for more information on GPIO pins used.
(Schematic Updated to Rev 1.1 to correct COL GPIO Pins sequence)
