The 6502 pinout has a reset pin, which presumably would be used if a reset button is pressed on the machine containing the CPU.
But the 6507 contains the same pin. The 6507 was designed at the request of Atari, to be an extremely stripped-down version of the chip, to save manufacturing cost by eliminating pins that were not absolutely needed; in particular, it can only address 8K of memory. Yet it still has the reset pin.
I conjecture from this that even if the machine does not have a reset button, the supporting circuitry must arrange for reset to be signaled when the power is turned on, in order to signal the CPU to place itself in a known suitable state to start executing code.
Is this correct?