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I came across an old development board with an ATMEL ATMEGA8A-PU . I am not an expert but I want to use this board. But something is missing in this board as seen in this photo:

ATMEL development board with a missing part

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closed as unclear what you're asking by Nick Alexeev Dec 30 '18 at 21:22

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  • \$\begingroup\$ Schematic is missing. \$\endgroup\$ – Nick Alexeev Dec 30 '18 at 21:21
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It is max232 ic.

Which is used to convert the signals from the RS232 serial port to the proper signal which are used in the TTL compatible digital logic circuits.

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    \$\begingroup\$ Yes, one can even see "MAX" on the silkscreen in the hole in the socket. \$\endgroup\$ – Unimportant Dec 30 '18 at 8:56
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    \$\begingroup\$ To add: The board should work without it, you only need it if you want to communicate over the RS232. \$\endgroup\$ – Michael Dec 30 '18 at 12:44
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    \$\begingroup\$ yes.. Michael is right... \$\endgroup\$ – Electron Dec 30 '18 at 12:45

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