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diff --git a/amforth-6.5/avr8/lib/calc-baudrate.frt b/amforth-6.5/avr8/lib/calc-baudrate.frt
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+
+\ calculates the baudrate register values
+\ the two bytes of the result should be
+\ transferred in high - low order
+
+\ ( baudrate -- baud-rate-register)
+: calc-baudrate
+ f_cpu
+ d2/ d2/ d2/ d2/
+ rot um/mod
+ swap drop 1-
+;