uRTC-8 is designed to work on the Z80 bus implemented by uIDE-8. The intention is that the board is connected to the Z80 bus in parallel to uIDE-8 to provide a means to set the host computer's clock at boot time, automatically. The uRTC-8 board is exactly the same size as uIDE-8 with matching mounting holes, so they can be stacked one above the other using PCB standoffs.
Refer to the uRTC [[UIDE_Universal_IDE_adapter_cards_for_Z-80_computers|uIDE CPC Wiki page ]] for further details on connectivity options. You don't need uRTC-8 in order to use uRTC-8 but you will need to choose a way to connect it to you computer. PCWs can use Z80 shim or the expansion port adapter; other Z80 computers can use the Z80 shim.
=== Pictures of the finished board ===