What are the specs for the clock signal (pin 2) on the cart slot ?
On the GB classic, pocket & GBC this clock is 1.048576 MHz. On the SGB this is 1.0738635 MHz. In GBC double speed mode only it is 2.097152 MHz. In all cases the signal is a square wave. This signal is present except when assembly commands STOP & HALT are active. When these commands are active this signal stays high.
