The 02 clock is a TTL compatible input used for internal device operation
and as a timing reference for communicating with the system data bus.  On
the Amiga, this is connected to the 680x0 "E" clock.  The "E" clock runs
at 1/10 of the CPU clock.  This works out to .715909 Mhz for NTSC or
.709379 Mhz for PAL.

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