A, B, see the D-pad come out of the Shield.

The button board registers presses of the ABXY buttons, the D-pad, and five control buttons.

We love the modularity of this design. Just in case the button mashing gets out of control, we are happy to know that the button board can be replaced separately from other components.

IC Identification:

Infineon (formerly Cypress Semiconductor) CY7C64345 enCoRe V USB 2.0 controller

STMicroelectronics MEMS microphone

ABLIC S-5712ANDL1-M3T1U hall sensor

Nexperia 74AUP1G14 Schmitt Trigger Inverter