User manual AOPEN AP5T-HW

[. . . ] Chapter 2 Hardware Installation This chapter gives you a step-by-step procedure on how to install your system. Follow each section accordingly. Caution: Electrostatic discharge (ESD) can damage your processor, disk drives, expansion boards, and other components. Always observe the following precautions before you install a system component. Do not remove a component from its protective packaging until you are ready to install it. [. . . ] Otherwise the system may hang or fail to reboot. 2-18 Hardware Installation 2. 3. 11 Keyboard The onboard keyboard connector is a five-pin AT-compatible connector marked as KB1. The view angle of drawing shown here is from back panel of the housing. Note: The mini DIN PS/2 keyboard connector is optional. PCB KB1 2-19 Hardware Installation 2. 3. 12 IrDA Connector Serial port 2 can be configured to support wireless infrared module, with this module and application software such as Laplink, user can transfer files to or from laptops, notebooks, PDA and printers. This mainboard supports IrDA (115Kbps, 1 meter) as well as ASK-IR (19. 2Kbps). Install infrared module onto IrDA connector and enable infrared function from BIOS setup, make sure to have correct orientation when you plug onto IrDA connector. Pin 1 2 3 4 5 6 Description +5V NC IRRX GND IRTX +3. 3V Note: Onboard serial port 2 (COM2) will not be available after IrDA connector is enabled. 1 2 3 4 5 6 IrDA 2-20 Hardware Installation 2. 4 Configuring the System Memory Pin 1 of DIMM2 Pin 1 of DIMM1 This mainboard has four 72 pin SIMM sockets (Single-in-line Memory Module) and two 168 pin DIMM socket (Dual-in-line Memory Module) that allow you to install system memory from minimum 8MB up to maximum 256MB. Pin 1 of Bank1 Pin 1 of Bank0 The SIMM supported by this mainboard can be identified by 4 kinds of factors: Size: single side, 1Mx32 (4MB), 4Mx32 (16MB), 16Mx32 (64MB), and double side, 1Mx32x2 (8MB), 4Mx32x2 (32MB), 16Mx32x2 (128MB). Speed: 60ns or 70ns access time Type: FPM (Fast page mode) or EDO (Extended data output) Parity: without parity (32 bit wide) or with parity (36 bit wide). The DIMM supported by this motherboard are always 64-bit wide SDRAM, which can be identified by following factors: I. Size: single side, 1Mx64 (8MB), 2Mx64 (16MB), 4Mx64 (32MB), 8Mx64 (64MB), 16Mx64 (128MB), and double side, 1Mx64x2 (16MB), 2Mx64x2 (32MB), 4Mx64x2 (64MB), 8Mx64x2 (128MB). Tip: Here is a trick to check if your DIMM is single-side or double-side -- if there are traces connected to golden finger pin 114 and pin 129 of the DIMM, the DIMM is probably double-side; otherwise, it is single-side. Following figure is for your reference. 168 85 Pin 129 Pin 114 2-21 Hardware Installation II. Speed: normally marked as as -12, which means the clock cycle time is 12ns and maximum clock of this SDRAM is 83MHz. Sometimes you can also find the SDRAM marked as -67, which means maximum clock is 67MHz. Buffered and non-buffered: This motherboard supports non-buffered DIMMs. You can identify non-buffered DIMMs and buffered DIMMs according to the position of the notch, following figure is for your reference: non-buffered Reserved buffered Because the positions are different, only non-buffered DIMMs can be inserted into the DIMM sockets on this motherboard. Although most of DIMMs on current market are non-buffered, we still recommand you to ask your dealer for the correct type. 2-clock and 4-clock signals: Although both of 2-clock and 4-clock signals are supported by AP5T, we strongly recommand you to choose 4-clock SDRAM in consideration of reliability. Tip: To identify 2-clock and 4-clock SDRAM, you may check if there are traces connected to golden finger pin 79 and pin 163 of the SDRAM. If there are traces, the SDRAM is probably 4-clock; Otherewise, it is 2-clock. Parity: This motherboard supports standard 64 bit wide (without parity) SDRAM. Because Pentium processor has 64 bit bus width, the four SIMM sockets are arranged in two banks of two sockets each, they are Bank0 and Bank1. Both SIMMs in each bank must be in the same size and type. It is allowed to have different speed and type in different bank, for example, 70ns FPM in one bank and 60ns EDO in another bank, in such case, each bank is independently optimized for maximum performance. [. . . ] SIMMs contain more than 24 chips exceed the chipset driving specification. Doing so may result in unstable system behavior. Warning: Although Intel TX chipset supports x4 SDRAM chip. Due to loading issue, it is not recommended to use this kind of SDRAM. [. . . ]