Specifications - American Megatrends Atlas PCI EISA User Manual

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Specifications

The American Megatrends Atlas PCI is a full AT-size motherboard. The motherboard has an onboard fast
IDE controller on the PCI local bus that supports IDE Modes 0, 1, 2 and 3 with 32-bit read/write, readahead,
and write posting. The motherboard has an I/O Controller that supports floppy drives, serial ports, and a
parallel port with ECP and EPP capabilities.
Motherboard Frequency
The Atlas PCI motherboard operates at either High or Low speed. High speed is the same as the speed of the
CPU mounted on the motherboard (60/66 or 90/100 MHz). Low speed is approximately the same speed as
that of an 8 MHz IBM® AT. Low speed is achieved by emulation.
The end user can select the frequency by:
selecting High or Low speed via an option in WinBIOS Setup Advanced Setup,
•
after system boot, pressing <Ctrl> <Alt> <-> for Low speed or <Ctrl> <Alt> <+> for High speed, or
•
after system boot, pressing the hardware Turbo switch mounted on the computer chassis.
•
Socketed CPU
The Atlas PCI Pentium EISA motherboard uses a 3.3V 90 or 100 MHz Intel P54C Pentium CPU operating
externally at 60 or 66 MHz in a ZIF socket.
Atlas PCI Pentium EISA Motherboard User's Guide
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