[Mark1960]

In post #1142 you are listing pairs of pin numbers, but only one trace is active in each scope capture. Was it the first or second pin that was on the active trace?

With the NOP generator connected the 6502 is scanning through all 64 K addresses, but the ram is only active during the first 16 K of those, so it does look correct that there would be some flicking of the signal between active and inactive.