I almost did suggest this, but it just seemed too crazy to suggest- try measuring the frequency on pin 7 with black on pin 7, red on pin 8 and see what you get then?
Mark's suggestion is a good one, I was looking to try to find some place where the 1Mhz was divided by two, in which case we could have looked at the output of that divider. I'll let Mark explain what he meant by looking at the lowest address line.
Edit: Crossed with Mark.
Quote:
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Something like 6022BL might be better as it doesn’t require assembly and has a 20 M sample per second.
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Here, I think Mark is referring to an alternative model of scope?