<img src="../images/pnp.png"/ width="500">
Change the voltage on the base to allow conductivity on the wire:
CMOS: complementary metal-oxide semiconductor, made up of n-type and p-type transistors
2-input, 4-output decoder
Repeat for each bit.
All combinations (AND array), pick which ones give true (OR array)
R = 1, S = 1 then latch holds its memory (whatever that is).
Gated D Latch
Series of Gated D Latches, one per bit.
Decoders and muxes.