CPY
(compare data and Y) Tags: NZC
Description:
Compares the data with the Y register by performing a subtraction (Y - data). Sets the N, Z, and C tags without saving the result of the subtraction anywhere. Z is set when the result equals zero, otherwise zeroed. N takes on the value of the highest bit of the result. C is set for Y>=data, erased for Y<data.
Example:
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