Why is the parent poster getting modded up as informative? I'd trust Amit over what appears to be an obvious troll. I'd also trust the 6500 spec sheet and the original Apple manual that I managed to dig up.

For example, it says in the Spec sheet "Addressable memory range of up to 65K bytes", "On-the-chip clock options: Crystal time base input", etc:

6500 data sheet

"Microprocessor Clock Frequency: 1.023 MHz"

Apple I Manual