I had also ALREADY tried using DEFINE OSC 10Mhz, it did not work.
That's because DEFINE OSC 10Mhz is the wrong syntax.

I didn't write the book - That's urban legend! (but I have seen it once in a previous life). I have never used the paper copy, because I downloaded the pdf and it's a hell of a lot easier to use the Adobe FIND feature to locate exactly what I'm looking for, rather than waste time thumbing through a hundred pages.

And if people can't figure where to download the pdf... then takeup landscape gardening for a hobby!

And finally John, the reason folks are reluctant to help when you haven't got a manual, is it usually applies to someone that has not acquired a legal copy (since the manual comes free with the product).