document many more cooincidental similarities with C64 ROMs

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Paul Gardner-Stephen committed 2019-05-07 12:17:52 +09:30
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Set a bit in $DD00
See other notes on bit manipulations of $DD00.
Manipulating bits in a bit is not creative or copyrightable.
Also, $DD00 is an IO register, which is expected to suffer
such bit manipulations.