AOpen AP5T-OV User Manual

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Chapter 1


The AP5T is a high-performancePentium®-basedsystem board that utilizes the PCI/ISA architecture andBaby AT form factor. It integrates the Intel82430TX PCIset, a Super I/O controller, and a PCI mode 4 enhanced IDE controller with bus master andUltra DMA/33 to enhance system performance. It has256KB or512KB pipelined-burstsecond-levelcache onboard and support four singlein-linememory module (SIMM) plus two Dualin-linememory module (DIMM) that allow tomix EDO and SDRAM memory and expansion up to a maximum of 256MB. For the memory and IDE performance, the Intel 430TX chipset is currently thefastest 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 implementsSuspend 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.



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 15Aover-currentprotection 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.




Form Factor

Baby AT

Board Size

220 mm x 280 mm


Intel Pentium Processor P54C, PP/MT (P55C), AMD


K5/K6, Cyrix 6x86 and IDT C6.

System Memory

FPM (Fast Page Mode) or EDO (Extended Data Output) 72-


pin SIMM x4, and SDRAM 168-pinx2 maximum 256MB.




256KB or 512KB pipelined-burstcache onboard


Intel 82430TX PCIset

Expansion Slots

ISA x3 and PCI x4

Serial Port

Two serial ports UART 16C550 compatible

Parallel Port

One parallel port supports standard parallel port (SPP),


enhanced parallel port (EPP) or extended capabilities port





Floppy Interface

Floppy interface supports 3.5 inches drives with 720KB,


1.44MB or 2.88MB format or 5.25 inches drives with


360KB, 1.2MB format



IDE Interface

Dual-channelIDE interface support maximum 4 IDE hard


disks or CDROM, mode 4 , bus master hard disk drives and


Ultra DMA/33 mode hard drives are also supported.



USB Interface

Two USB ports supported by USB bracket, the BIOS also


supports USB driver to simulate legacy keyboard.

PS/2 Mouse

PS/2 mouse supported by PS/2 mouse bracket.


Default AT compatible keyboard, mini-DINPS/2 keyboard


connector is optional.



RTC and Battery

RTC build in Intel PIIX4 chipset, Lithium (CR-2032)




AWARD Plug-and-PlayFlash ROM BIOS

Suspend to Hard Drive

Supported by BIOS, save your work to hard disk and


resume within a very short time. VESA compatible VGA


and Sound Blaster compatible sound card required.



Switching Regulator

High efficient switching regulator for future CPU.


3.3V 10A and CPU core voltage 15A over-current


protection to prevent any accident short circuit.

CPU Thermal

Warning when CPU temperature is higher than the


predefined value.