EPOX EP-3S1M, Manual, Page: 12 / 84

Introduction EP-3S1M
Page 1-6
EP-3S1M Form-Factor
The EP-3S1M is designed with Micro-ATX form factor - the new industry standard
of chassis. The Micro-ATX form factor is essentially a Baby-AT baseboard rotated
90 degrees within the chassis enclosure and a new mounting configuration for the
power supply. With these changes the processor is relocated away from the
expansion slots, allowing them all to hold full length add-in cards. Micro-ATX
defines a double height aperture to the rear of the chassis which can be used to
host a wide range of onboard I/O. Only the size and position of this aperture is
defined, allowing PC manufacturers to add new I/O features (e.g.; TV input, TV
output, modem, LAN, etc.) to systems. This will help systems integrators differen-
tiate their products in the marketplace, and better meet your needs.
• Smaller size promotes a smaller system size.
• I/O shield does not need to be retooled in an ATX 2.01 or later. Mainboard
could be used in an ATX 2.01-compliant.
• A smaller power supply cam be used. High integration on mainboard reduces
the system costs.
Full length
slots
Expandable I/O
5 1/4"
Bay
3 1/2"
Bay
Figure 2: Summary of Micro-ATX chassis features
CPU located near
Power Supply
Single chassis
fan for system
ATX
Power
Supply
ATX power
connector
Floppy / IDE
connectors
close to
peripheral
bays