Chapter 14: Power Supply and Electrical Issues^325
Baby AT This is a smaller version of the AT form factor; it has the same height
and depth but is two inches narrower than the AT form factor. The Baby AT power
supply (see Figure 14-7) was very popular during the late 1980s and early 1990s.
LPX This form factor is also known as the Slimline or PS/2 form factor. The
LPX (low profile) power supply (see Figure 14-8) is shorter and smaller in
general, but it produces the same power and cooling ability as the Baby AT
and AT. The LPX form factor has generally replaced the Baby AT.
ATX The ATX form factor was a major change from the form factors based on
the PC XT and PC AT. The ATX is considered the de facto form factor standard
for all PCs, whether desktop or tower. On the outside, the ATX power supply
(see Figure 14-9) looks the same as the LPX in size and has its cables in about
the same place. The AC power pass-through outlet, which was used for PC
monitors on early form factors, was removed from the ATX power supply.
NLX The NLX form factor does not define a power supply and uses the same
power supply as the ATX. As a result, the ATX form factor is also called the
ATX/NLX form factor.
SFX This is a power supply–only form factor. Intel developed it for use in the
microATX and FlexATX form factors.SFrefers to itssmall form.Figure 14-7. Baby AT power supply