pico-zxspectrum/docs/pico_zx48_128.md

PICO ZX48/128

This target matches the circuit board created by Bobricius. It matches the original layout of the ZX Spectrum keyboard allowing it to be used with the old membranes.

Joystick buttons & modes

The PCB has some buttons which can act as a joystick or the ZX Spectrum cursor. The LED on the Pico PI indicates the mode:

LED	mode
OFF	Joystick mode
ON	Cursor mode

To switch mode make sure you are viewing the ZX Spectrum display (not the menus), then press CAPS SHIFT and one of <<< or >>> at the same time:

Keys	Mode
CAPS SHIFT <<<	Cursor
CAPS SHIFT >>>	Joystick

When the machine boots, the buttons are configured to act as a joystick.

When in joystick mode, the buttons act as a Kemptson joystick.

Manu key mappings

These are Spectrum keyboard actions that can navigate the settings menu:

keys conbination	Action
CAPS-4	Page Down
CAPS-5	Cursor Left
CAPS-6	Cursor Down
CAPS-7	Cursor Up
CAPS-8	Cursor Right
CAPS-9	Page Up
Enter	Perform action

Circuit Diagrams

Firmware

Display mode	Firmware
720x576x50Hz	ZxSpectrumPicomputerVgaAukBob_720x576x50Hz.uf2
640x480x60Hz	ZxSpectrumPicomputerVgaAukBob_640x480x60Hz.uf2

References

ZXRenew for cases and keyboards
YouTube 1
YouTube 2