Nice work, George!
I'm attaching two somewhat similar documents which I cobbled together for my own use. Rather than being a general quick reference, they're just some collected notes, comparatively detailed. The first deals with Shift Register operation, and the second lists differences between the "N" and "S" versions of the WDC 6522's.
-- Jeff
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In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html