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add more explanations of common instruction sequences

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Paul Gardner-Stephen committed 2019-04-24 10:21:52 +09:30
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strings/C900D0
+7
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@@ -0,0 +1,7 @@
Compare A with zero before branching
CMP #$00
Bxx $nnnn
This is a common way to take a branch based on whether the A register
holds zero or not.