What do the numbers mean on the processor?

[Sandivar]

I have two AMD processors. I'm wondering what the number/letter combos on the processors mean.
One says AO850MPR24B A
One says K7600MTR51B A

I get that the first one is an 850 Mhz and the second is a 600 Mhz K7. But what does the AO signify and how does that differ from the K7?

Thanks, I'm kinda new to this.

 

[Sandivar]

anyone?

 

[Boyne7]

They most likely signify a stepping code and package date
i dont know which specific stepping or package date they refer to

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