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Re:Building a new Windows 3.1 app in 2019: A Slack Client by DaiPlusPlus on Thursday December 19, 2019 @04:05AM (#21833222)
MCU?
Re:Building a new Windows 3.1 app in 2019: A Slack Client by markus92 on Thursday December 19, 2019 @04:13AM (#21833254)
Microcontroller unit.
Re:Building a new Windows 3.1 app in 2019: A Slack Client by stevefan1999 on Thursday December 19, 2019 @04:38AM (#21833368)
Think MCUs are of the kinds like Arduino and microBit. There are also SBCs where bigger and more power hungry devices like Raspberry Pi belongs to.
Re:Building a new Windows 3.1 app in 2019: A Slack Client by that_jojo on Thursday December 19, 2019 @09:09AM (#21834986)
Super late, but the term MCU refers to the actual chip -- analogous to SoC for the main chip on a raspi.

You don't call the raspi an SoC, and it's debatable that you'd call a prototyping platform like Arduino an MCU. The MCU is the main Atmel AVR, Microchip PIC, or similar part that drives such a board.