550S

Centuries: 5th century - 6th century - 7th century Decades: 500s - 510s - 520s - 530s - 540s - 550s - 560s - 570s - 580s - 590s - 600s Years: 550 551 552 553 554 555 556 557 558 559 560
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16550 uart
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20 gate
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