add explanations for remaining coincidental similarities

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Paul Gardner-Stephen committed 2019-05-07 12:40:41 +09:30
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set a bit in $DD00, Return from subroutine, read $DD00
$DD00 is a key IO register for the IEC serial port.
Thus it is no surprise to find routines that manipulate $DD00,
and indeed for them to appear one after the other.
Nothing creative. Not copyrightable.