Hardware Reference
In-Depth Information
drives and devices and feature the same +12V, +5V, and ground pins as the larger peri-
pheral power connector. The floppy power connector has four pins spaced 2.5mm (0.098
inches) apart, which makes the entire connector about half the overall width as the larger
peripheral power connector. The pins are rated for only 2 amps each, giving a maximum
power-handling capability of 34 watts.
Table 18.20 shows the pinouts for the smaller floppy drive power connector.
Table 18.20 Pinout for the 3 1/2-Inch Floppy Power Connector (Small Drive Power Connector)
Theperipheralandfloppypowerconnectorsareuniversalwithregardtopinconfiguration
and even wire color. Figure 18.30 shows the peripheral and floppy power connectors.
Figure 18.30 Peripheral and floppy power connectors.
The pin numbering and voltage designations are reversed on the floppy power connector.
Be careful if you are making or using an adapter cable from one type of connector to an-
other. Reversing the red and yellow wires fries the drive or device you plug into.
Early power supplies featured only two peripheral power connectors, whereas later power
supplies featured four or more of the larger peripheral (disk drive) connectors and one or
two of the smaller floppy power connectors. Depending on their power ratings and inten-
ded uses, some supplies have as many as eight or more peripheral or floppy power con-
nectors.
 
 
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