A socket position for a 300mil 20 pin DIP is located above U1.
All 20 pins are connected to an adjacent header to allow connection to the circuit built in the prototype area.
If required, this socket can be used for any 20 pin microcontroller by simply connecting power, ground and clock signals across from U1.
You can also plug in two IC with fewer than 20 pins between then (eg. 2 x 8 pin DIPs)
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