Berg connector connects with floppy disk drive
the four-pin polarized Berg connectors used to connect 3½-inch floppy disk drive units to the power supply unit, usually referred to as simply a "floppy power connector", but often also referred to as LP4. This connector has a 2.50 mm (0.098 in) pitch (not 2.54 mm).
the two-pin Berg connectors used to connect the front panel lights, turbo switch, and reset button to the motherboard.
the two-pin Berg connectors used as jumpers for motherboard configuration.Floppy drive power connector
The power connector on the 3½-inch floppy drive, informally known as "the Berg connector", is 2.50 mm pitch (distance from center to center of pins).
The power cable from the ATX power supply consists of 20 AWG wire to a 4-pin female connector.  The plastic connector housing is TE Connectivity / AMP 171822-4 with female metal contact pins are choice of TE Connectivity / AMP 170204-* or 170262-*, where * is 1 or 2 or 4.The male PCB connector on the 3½-inch floppy drive is a polarized right-angle male header, which is a TE Connectivity / AMP 171826-4,  the straight model is AMP 171825-4.