AOpen AP5T-OV User Manual

Chapter 1

Overview

The AP5T is a high-performance Pentium-based system board that utilizes
the PCI/ISA architecture and Baby AT form factor. It integrates the Intel
82430TX PCIset, a Super I/O controller, and a PCI mode 4 enhanced IDE
controller with bus master and Ultra DMA/33 to enhance system performance.
It has 256KB or 512KB pipelined-burst second-level cache onboard and
support four single in-line memory module (SIMM) plus two Dual in-line
memory module (DIMM) that allow to mix EDO and SDRAM memory and
expansion up to a maximum of 256MB. For the memory and IDE performance,
the Intel 430TX chipset is currently the fastest Pentium chipset in the market.

Another feature that AP5T intends to implement is the new power
management features of Advanced Configuration Power Interface (ACPI).
The most attractive feature of ACPI for desktop user is probably OnNow, an
idea from Notebook. You don't have to go through the entire boot process, into
Win95, and back to your original work. Since ACPI specification is not fully
defined yet. AP5T implements Suspend to Hard Drive by BIOS, from user
point of view, it is the same as OnNow. Note that you have to use VESA
compatible VGA (AOpen S3 PCI PV70/PT70), Sound Blaster compatible
sound card (AOpen AW35/MP56), Rockwell compatible Modem (AOpen
F56/MP56) for Suspend to Hard Drive to work properly.

Note: ACPI is a specification of PC97, it is not
fully defined yet. Although AOpen will try the best
to support ACPI (normally, through BIOS
modifications), it is still possible AP5T can not fully
comply ACPI specification.

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Overview

There are also more features start to be implemented from AP5T revision 3.xx.
Switching Power Regulator, Although Linear Regulator of AP5T revision 2 is

good enough for AMD K6, AP5T revision 3.xx uses switching requlator to
reserve the upgrade capability for new generation CPU.

Over-current Protection, AP5T revision 3.xx implements 3.3V (chipset,
PBSRAM, SDRAM) 10A and CPU core voltage 15A over-current protection to
prevent any accident short circuit and prevent system damage.

CPU Thermal Protection, When CPU temperature is higher than a predefined
value, the CPU speed will automatically slow down and there will be warning
from BIOS and also ADM (AOpen Desktop Manager, similar as Intel LDCM), if
ADM is installed.

FCC DoC certificate

The AP5T has also passed FCC DoC test, this means you can use any kind of
housing with very low EMI radiation.

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