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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PLA / TAX / PLA / RTI
Pop A and X registers from the stack and return from interrupt.
Standard end of interrupt sequence on 6502.
See, for example, https://en.wikipedia.org/wiki/Interrupts_in_65xx_processors
Not copyrightable.