BOM: https://docs.google.com/spreadsheets/d/1xnDOzoy5LGNIdBct7SGujVm50BPZGppM3Yq_b03ajBQ/
R3, R2, R1, R0
J2, J3, J0, J1
C1
D1
JB, JA
JC
R4
U1
C3
C2
S1