Pins 2, 3 and 7 are used for communication on your RS232 ports. While other pins are used, most are just for protocol (RTS, CTS, and other pins for more advanced communication)
The link below gives more information on the subject.
http://www.lammertbies.nl/comm/cable/RS-232.html
68
I'm not positive, but you might be able to buy a premade adapter.
STAGE PIN 1, TWISTLOCK 2, EDISON 3
It uses the standard 48 Pin dock connector.
Most of modern motherboads use 24 pin power connector (ATX 2.x). Older motherboards use different type that uses only 20 pin connector. ATX 2.x is usually backward compatible with older 20 pin connector.
1394B
15 pin, 3 rows
power supply
BTX motherboards use a 24-pin power connector.
Laptop power supplies are class II products, they don't use the earth pin.
a technician look at the motherboard and sees 24-pin connector. what component would connect to the motherboard through the use of this 24-pin connector
Not all do. A ground terminal is a safety feature. Yes, it is much safer when we use the laptop.