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14. Motherboards. Dezső Sima Fall 2006.  D. Sima, 2006. Overview. 1 Predecessors. 2 Desktop motherboards. 2.1 Overview. 2.2 AT. 2.3 Baby AT. 2.4 LPX. 2.5 ATX. 2.6 NLX. 2.7 BTX. 3 Server/workstation motherboards. 4 Overview of the evolution of motherboards. 1. Predecessors (1). - PowerPoint PPT Presentation


  • 14. MotherboardsDezs Sima

    Fall 2006 D. Sima, 2006

  • 2 Desktop motherboards 2.2 AT Overview3 Server/workstation motherboards 1 Predecessors 2.4 LPX 2.3 Baby AT 2.5 ATX 2.7 BTX 2.6 NLX 2.1 Overview 4 Overview of the evolution of motherboards

  • 1. Predecessors (1)Figure 1.1: Main features of early IBM/PCsBaby ATATMin. on-boardMax. on-boardSizeKB8-bit16-bitinchesmmIBM/PC51508/8180884.7716 KB64 KBSoldered+DIPPnono5-IBM/PC-XT5160 Mod. 0873/8380884.77128 KB256 KBDIPPno360 K10 MB8-8.5"*12"216*3055170 Mod. 0688/84802866256 KB512 KBno1.2 M-5170 Mod. 0998/84802866512 KB512 KBno360 K20 MB2612"*13.8"305*350Type 1 MOBMod. 23910/85802866512 KB512 KBno720 K30 MB269.3"*13.8"238*350Type 2 MOBMod. 3194/86802868512 KB512 KB1.44 M30 MB269.3"*13.8"238*350Type 2 MOBMod. 3394/86802868512 KB512 KB1.44 M30 MB269.3"*13.8"238*350Type 2 MOB IBM/PC XT-2869/86802866640 KB1.2 M20 MBMotherboard sizeFDChipsetHDMemory sizeNo. of ISA slotsRemarksIBM/PC-ATDate of Proc. fcDesignationTypeTypeMhzintro.typeMemory11BASIC compiler in PROM, up to two optional 5162640 KBDIPPDIPPDIPPDIPPDIPPDIPP+SIMM/30nonono(standard)(standard)MB263512"*13.8"8.6"*13"305*350218*330Type 1 MOBFD with 160 KB/diskette, the max. on-board memory was increased to 256 KB in 3/83.23342Several further models followed with enhanced features.84-Key keyboard.4101-Key keyboard.4

  • 1. Predecessors (2)Figure 1.2: The motherboard of the IBM PC5x ISA/16Source: http://www.tomh.net/museum/mobo/pccassif.htmlKeyboardCasetteDMAvezrlParallelI/OIntel 8088CPU8087 arithm.proc. socketRAM

    16-64 kbyteor64-256 kbyteROMPC

  • 1. Predecessors (3)Figure 1.3: Main features of early COMPAQ PCsBaby AT

  • Figure 2.1: Genealogy of major form factors2. Main types of motherboards2.1. Overview (1)929394959697989991900203010004058988878685849/0312/991/988/9511/961987~19858/8411234567Baby AT: Smaller board size through higher integrated components (chip sets)Non-standardized slimline design with a central mounted riser card allowing 2-3 expansion slotsThrough better component arrangement reduced cost and EMI emission, integrated AGP (from version 2.02 on) Standardized, improved slimline design with an edge mounted riser card, integrated AGPLow cost slimline ATX design by using a riser card with 2-3 expansion slotsReduced size low cost ATX design with up to four expansion slotsIn-line core layout to improve system cooling with scalable board dimensionsChipsetsSlim boxesEnhanced versionValueorientedEfficientcoolingEnhanced versionValueoriented

  • Figure 2.2: Introducing new types of system architectures2.1. Overview (2)929394959697989991900203010004058988878685849/0312/991/988/9511/961987~19858/84 PCI

  • Figure 2.3: Introducing the PCI bus

  • 929394959697989991900203010004058988878685849/0312/991/988/9511/961987~19858/84 PCIHUB architectureFigure 2.2: Introducing new types of system architectures2.1. Overview (2)

  • PMCHICHHUB architecturePSystem contr.Perif. contr.PCI architecturePCIISAPCIFigure 2.4: Contrasting the PCI and the HUB architectures

  • Figure 2.5: Introducing new types of memory modules929394959697989991900203010004058988878685849/0312/991/988/9511/961987~19858/84 SIMM/72DIMM/1682.1. Overview (3)

  • Figure 2.6: Introducing new types of buses929394959697989991900203010004058988878685849/0312/991/988/9511/961987~19858/84PCIATAUSBAGPAC 97SATAPCI-ELPC2.1. Overview (4)

  • Figure 2.7: Salient features of major form factors2.1. Overview (5)ATBaby ATLPX (Western Digital)NLXATXMicroATXBTXMicroBTXPicoBTXType of Typical board measures (W*D) CaseDate ofintro.Quasi-standard12"*13.8"9.6"*9.6"mm244*2448.6"*13" (~9"-13")9"*13" (~9"-13")(8"-9")*(10"-13.6")12"*9.6" (~7"-9.6")12.8"*10.5"10.4"*10.5"8"*10.5"305*244 (~178-244)325*267305*350218*330 (~229-330)229*330 (~229-330)(203-229)*(254-345)Full AT, Full TowerBaby ATATXSlimline264*267203*2678/84~1985~19878/959/039/039/03strandardinches11/961/98Quasi-standardQuasi-standardStandardStandardStandardStandardStandardStandardSlimlineW: Maximum allowable widthD: Maximum allowable depthTyp. nr. of I/O-slotsATX with riser12/99StandardMicroATX with riser12/99StandardSlimlineSlimline87/83/473/474412/32/3MicroATXBTXMicroBTXPicoBTX9.6"*9.6"12"*9.6" (~7"-9.6")244*244305*244 (~178-244)

  • 305KBD8/16-bit ISA slotsDIPP

    CPU(286)PCKBD3502.2. AT (1)Figure 2.8: Layout of an AT-motherboard

  • 2.2. AT (2)Figure 2.9: The motherboard of the IBM PC/AT

    2x 8 bit/5x 16 bitISAKeyboardIntel 8088CPU8087 arithm.proc. socketDRAM512 KbytePCSource:http://library.thinkquest.org/18268/photos.htm

  • 2.2. AT (3)This is a Western Digital Disk Drive Interface Card.This is a Case Interface, both parallel and serial.Figure 2.10: Adapter cards of the IBM PC/ATSource:http://library.thinkquest.org/18268/photos.htm

  • 2.3. Baby AT (1)Figure 2.11: Layout of an early Baby AT-motherboard

  • 2.3. Baby AT (2)ISA/16 slots

    CPU(Pentium)KBDSIMM/72PCI/32 slotsL2 cacheHDFDPC218230Figure 2.12: Layout of a late Baby AT-motherboard

  • 2.3. Baby AT (3)Figure 2.13: Example: A Pentium-based late Baby AT-motherboardCPU3x PCI/324x SIMM/723x ISA/16L2Periph.contr.FDIDESystemcontr.PC

  • 2.4. LPX (1)229FDPCHDL2 cache I/O connectors RAM SIMM/72330Riser cardISA/16PCI/32


    DIPPFigure 2.14: Layout of an LPX-motherboard

  • 2.4. LPX (2)Figure 2.15: Example: A Pentium-based LPX-motherboard (The PB680 from Packard Bell)source: http://www.geocities.com/anotherpackardbellsite/en_pb_carte680.htm#1

  • 2.5. ATX (1)Figure 2.16: Layout principles of an ATX case1 Double-high expandable I/OSource: ATX Specification v. 2.01,Source: http://www.berkprod.com/docs/atx_201.pdf

  • Source: ABIT SL6 Userss Manualhttp://www.abit.com.tw

  • 2.5. ATX (1)Figure 2.18: Layout principles of an ATX case1 Double-high expandable I/O2 One chassis fan3 Processor located near power supply4 One power connector5 Connectors close to peripheral bays6 Easy to access system memory7 Six full-length slotsSource: ATX Specification v. 2.01,Source: http://www.berkprod.com/docs/atx_201.pdf

  • 2.5. ATX (2)Figure 2.19: Placement of the mounting holes on the AT, Baby AT, and ATX motherboardsATXBaby ATATSource: ATX Specification v. 2.01,Source: http://www.berkprod.com/docs/atx_201.pdf

  • Main types of ATX motherboardsEarlyPCI-based430IDE/ATAPentiumLatePCI-based440AGPPentiumII/PentiumIII(slot 1)Early port-based81x/82xPentiumIIIMatureport-based84x/86xSerialport-based915PCI-EPentium4Pentium4ExampleExampleExampleExampleUSBChipsetI/OProcessor2.5. ATX (3)Typ.MemorySIMM/72DIMM/168Prescott

  • Figure 2.20: Main types of ATX motherboards9293949596979899919002030100040589888786858412/998/9511/961987~19858/841 Late PCIbasedEarly portbasedMature portbasedSerial portbased2.5. ATX (4)

  • Figure 2.21: Layout of a late PCI-based ATX-motherboard2.5. ATX (5)PCISA/16I/O connectorHDDIMM/168PCI/32AGPFDPC305186USBSlot1 (Pentium II/III)

  • Figure 2.22: A late PCI-based motherboard for PentiumIIs (MSIs MS-6111) (Based on Intels 440LX chipset for slot 1 processors (1997)Source: http://www.msi.com.tw/program/support/downloadCPU(Slot1)4x PCI/324x DIMM/168Peripherialcontr.FDIDESystem contr.PCBIOSAGPATX connectorsBattery3x ISA/162.5. ATX (6)

  • Figure 2.23: Layout of an early port based ATX-motherboard for Pentium III/Pentium4 processors.PCISA/16I/O connectorHDDIMM/168PCI/32AGPFDPC305186USB

    CPU(Pentium III)2.5. ATX (7)

  • Figure 2.24: Early, port based ATX motherboard for Pentium IIIs (Abits SL6)(based on Intels 815 chipset) Source: http://www.abit-usa.com/products/mb 5x PCI/32AGPCNRATX connectorsCPUMCH3x DIMMICHFDIDEBIOSBatteryPC2.5. ATX (8)

  • Fgure 2.25: Mature port-based ATX motherboard for Pentium4 processors (Intels D865PERL)CPU (P4)4x PCI/324x DIMM/168ICHFDIDEMCHPCBIOSAGPATX connectorsBattery2.5. ATX (9)Source: http://www.intel.com/products/motherboard/d865perl/index.htm

  • 2.5. ATX (10)Figure 2.26: Layout of a serial-port based ATX-motherboard for Pentium4 Prescott processors.

  • PSFDIDE2xIDE3x PCI/322x PCI Ex1PCI Ex164x DIMMFigure 2.27: Serial port-based ATX-motherboard for Pentium4 Prescotts (MSIs 915G Combo)4x SATAP4 PrescottIHC6/6R

    MCH(915P/G)BatIDE RAID c.(VIA 6410)2x USBBIOSSyst. monitoring2.5. ATX (11)http://www.pricegrabber.com/search_getprod.php/masterid=3191326

  • 2.6. NLX (1)I/O connectorsSIMM/168AGPSlot1 (Pentium II/III)PCI/32HDFDISA/16Riser cardPC229330Figure 2.28: Layout of an NLX-motherboard

  • 2.6. NLX (2)Figure 2.29: View of an NLX-motherboardSource: Intel Corporation, Intel NLX Form Factorhttp://www.intel.com

  • 2.7. BTX (1)Figure 2.30: Overview of BTX-motherboard sizesSource: Shimpi A.L., Balanced Technology eXtended (BTX) Form Factor Sept. 2003http://www.anandtech.com/

  • 2.7. BTX (2)Figure 2.31: Layout of a micro BTX-motherboard

  • 2.7. BTX (3)Figure 2.32: A micro BTX-motherboard (Intels D915GMH)CPU4x DIMM/168ATX connectorsMCH


  • 2.7. BTX (4)Figure 2.33: Temperature distribution in the example motherboardSource: Shimpi A.L., Balanced Technology eXtended (BTX) Form Factor Sept. 2003http://www.anandtech.com/

  • Figure 3.1: Block diagram of a pserial port-based entry level server motherboard ( P8SCT) 3. Server/workstation motherboards (1)Source:http://www.supermicro.com/products/motherboard/P4/E7221/P8SCT.cfm

  • Figure 3.2: Example: A P4-based ATX-board for entry-level servers (The P8SCT from Supermicro)3. Server/workstation motherboards (2)Source:http://www.supermicro.com/products/motherboard/P4/E7221/P8SCT.cfm4x DIMMA