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Re:Easy 6502 by pvg on Monday May 30, 2022 @03:10PM (#31562498)
which instructions are really necessary (maybe all of them?) and why it would be inconvenient if you didn't have a particular instruction

The ones added in the 65C02 offer some insight there, a very brief overview from the Wikipedia page:

https://en.wikipedia.org/wiki/WDC_65C02#New_and_modified_ins...

Somewhat related and mentioned in one of the comments downthread, you can view Woz's SWEET16 as a 'the 16 bit CPU a 6502 system designer and programmer wished they had' take.

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