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.
Again, $DD00 is a register that is used for the IEC serial interface.
Clearing and setting bits in it is required to implement the protocol.
Also, clearing and setting bits in a memory location is not creative
or copyrightable.