AlphaPC AlphaPC 164LX User manual

AlphaPC 164LX Motherboard
Windows NT
User’s Manual

Notice
The information in this publication has been carefully checked and is believed to be entirely accurate at the time of publication.
Samsung assumes no responsibility, however, for possible errors or omissions, or for any consequences resulting from the use
of the information contained herein.
Samsung reserves the right to make changes in its products or product specifications with the intent to improve function or
design at any time and without notice and is not required to update this documentation to reflect such changes.
This publication doesnot convey to a purchaser of semiconductor devices described herein any license under thepatent rights of
Samsung or others.
AlphaPC 164LX Motherboard
Windows NT
User’s Manual
©1997 Samsung Electronics
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by
any means, electric or mechanical, by photocopying, recording, or otherwise, without the prior written consent of Samsung
Electronics.
Alpha, Digital Semiconductor are trademarks of Digital Equipment Corporation.
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FaxBACK and Intel are registered trademarks of Intel Corporation.
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Microsoft, MS-DOS, Windows, and Windows 95 are registered trademarks and Windows NT is a trademark of Microsoft
Corporation.
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San #24 Nongseo-ri, Kiheung-eup
Yongin-city, Kyungki-do, Korea
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Printed in the Republic of Korea

iii
Contents
1 About This Manual
1.1 Manual Conventions and Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
2 Features of the AlphaPC 164LX Motherboard
2.1 Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
2.2 Environmental Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
2.3 Physical Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
2.4 ATX I/O Shield Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
3 AlphaPC 164LX Jumper Configuration
3.1 CPU Speed Selection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
3.2 Bcache Size Jumpers (CF1 and CF2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1
3.3 Password Bypass Jumper (CF3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
3.4 Boot Option Jumper (CF7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
3.5 Flash ROM Update Jumper (J28). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
4 AlphaPC 164LX Connector Pinouts
4.1 PCI Bus Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
4.2 ISA Expansion Bus Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–3
4.3 SDRAM DIMM Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–4
4.4 EIDE Drive Bus Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–5
4.5 Diskette Drive Bus Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6
4.6 Parallel Bus Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6
4.7 COM1/COM2 Serial Line Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–7
4.8 Keyboard/Mouse Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–7
4.9 SROM Test Data Input Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–8
4.10 Input Power Connector Pinouts4–8

iv
4.11 Enclosure Fan Power Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–8
4.12 Speaker Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–9
4.13 Microprocessor Fan Power Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . 4–9
4.14 Power LED Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–9
4.15 IDE Drive LED Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–10
4.16 Reset Button Connector Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–10
4.17 Halt Button Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–10
4.18 Soft Power Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–10
5 Memory and Microprocessor Configuration
5.1 Configuring SDRAM Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
5.2 Upgrading SDRAM Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
5.3 Increasing Microprocessor Speed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
5.3.1 Preparatory Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
5.3.2 Required Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
5.3.3 Removing the 21164 Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
5.3.4 Installing the 21164 Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
6 Interrupts and ISA Bus Addresses
6.1 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
6.2 ISA I/O Address Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2
6.2.1 Flash ROM Address Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–3
7 Configuring for Windows NT
7.1 AlphaBIOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1
7.1.1 AlphaBIOS Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1
7.1.2 Starting the AlphaBIOS Setup Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–2
7.1.3 Upgrading AlphaBIOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–3
7.1.4 Performing CMOS Setup Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4
7.1.5 Setting Up Your Hard Disk. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4
7.1.6 Displaying Your System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–5
7.1.7 Running a Maintenance Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–7
7.2 Installing the Windows NT Operating System. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–8
7.2.1 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–9
7.2.2 Before Installing Windows NT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–9
7.2.3 Starting Windows NT Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–10

v
8 Troubleshooting
8.1 Password Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–1
8.2 Hardware Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–1
8.3 Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–2
8.4 Post Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–2
8.5 Fail-Safe Booter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–3
8.6 Windows NT Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–4
9 Battery Recycle/Disposal Information
A Supporting Products
A.1 Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1
A.2 Thermal Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–2
A.3 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–2
A.4 Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–3
B Associated Documentation

vii
Tables
2–1 AlphaPC 164LX Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
2–2 AlphaPC 164LX Jumper/Connector/Component List . . . . . . . . . . . . . . . . . . . . . . 2–3
2–3 Power Supply DC Current Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
2–4 AlphaPC 164LX Motherboard Environmental Requirements . . . . . . . . . . . . . . . . 2–5
4–1 PCI Bus Connector Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
4–2 ISA Expansion Bus Connector Pinouts (J30, J31) . . . . . . . . . . . . . . . . . . . . . . . . 4–3
4–3 SDRAM DIMM Connector Pinouts (J8 through J11). . . . . . . . . . . . . . . . . . . . . . . 4–4
4–4 EIDE Drive Bus Connector Pinouts (J6, J7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–5
4–5 Diskette (Floppy) Drive Bus Connector Pinouts (J15). . . . . . . . . . . . . . . . . . . . . . 4–6
4–6 Parallel Bus Connector Pinouts (J13). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–6
4–7 COM1/COM2 Serial Line Connector Pinouts (J4). . . . . . . . . . . . . . . . . . . . . . . . . 4–7
4–8 Keyboard/Mouse Connector Pinouts (J5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–7
4–9 SROM Test Data Input Connector Pinouts (J29) . . . . . . . . . . . . . . . . . . . . . . . . . 4–8
4–10 Input Power Connector Pinouts (J3)1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–8
4–11 Enclosure Fan (+12 V dc) Power Connector Pinouts (J2, J19) . . . . . . . . . . . . . . 4–8
4–12 Speaker Connector Pinouts (J20). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–9
4–13 Microprocessor Fan Power Connector Pinouts (J18) . . . . . . . . . . . . . . . . . . . . . . 4–9
4–14 Power LED Connector Pinouts (J24) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–9
4–15 IDE Drive LED Connector Pinouts (J25). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–10
4–16 Reset Button Connector Pinouts (J21) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–10
4–17 Halt Button Connector Pinouts (J22) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–10
4–18 Soft Power Connector Pinouts (J1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–10
5–1 AlphaPC 164LX SDRAM Memory Configurations . . . . . . . . . . . . . . . . . . . . . . . . 5–1
6–1 ISA Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
6–2 ISA I/O Address Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2
7–1 Action Keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–2
7–2 CMOS Setup Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4
8–1 Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–2
8–2 Post Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8–2

vi
Figures
2–1 AlphaPC 164LX Jumper/Connector/Component Location . . . . . . . . . . . . . . . . . . 2–2
2–2 ATX I/O Shield Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6
2–3 ATX Hole Specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7
3–1 AlphaPC 164LX Configuration Jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
5–1 Fan/Heat-Sink Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–5
7–1 AlphaBIOS Boot Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–3
7–2 Display System Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–6
7–3 Run Maintenance Program Submenu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–7
7–4 Entering the Program Name. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–8

About This Manual 1–1
1
About This Manual
This manual describes the AlphaPC 164LX motherboard, a module for computing
systems based on the AlphaTM 21164 microprocessor and the companion Digital
Semiconductor 21174 core logic chip. It describes the motherboard’s features and
how to set its configuration jumpers. This manual helps users to install and populate
the AlphaPC 164LX motherboard with memory modules and peripheral cards.
1.1 Manual Conventions and Terminology
The following conventions are used in this manual.
Caution: Cautions indicate potential damage to equipment, software, or data.
Note: Notes provide additional information about a topic.
Numbering: All numbers are decimal or hexadecimal unless otherwise indicated. In
case of ambiguity, a subscript indicates the radix of nondecimal numbers. For
example, 19 is a decimal number, but 1916 and 19A are hexadecimal numbers.
Extents: Extents are specified by a single number or a pair of numbers in square
brackets ([ ]) separated by a colon (:), and are inclusive. For example, bits [7:3]
specify an extent including bits 7, 6, 5, 4, and 3. Multiple bit fields are shown as
extents.
Register Figures: Register figures have bit and field position numbering starting at
the right (low-order) and increasing to the left (high-order).
Signal Names: All signal names are printed in boldface type. Signal names that
originate in an industry-standard specification, such as PCI or IDE, are printed in the
case as found in the specification (usually uppercase). Active low signals have either
a pound sign “#” appended, or a “not” overscore bar; for example, DEVSEL# and
RESET.

1–2 About This Manual
Manual Conventions and Terminology
Italic Type: Italic type emphasizes important information and indicates complete
titles of documents.
Terms: The following terms are used in this manual:
This term... Refers to...
Microsoft Windows NT installation
guide The Microsoft Windows NT Workstation Installation Guide and the Windows NT Server
Installation Guide.
Windows NT The Microsoft Windows NT Workstation and the
Windows NT Server operating systems.

Features of the AlphaPC 164LX Motherboard 2–1
2
Features of the AlphaPC 164LX Motherboard
Table 2–1 provides an overview of the AlphaPC 164LX motherboard’s features.
Figure 2–1 shows the AlphaPC 164LX motherboard and its components.
Table 2–1 AlphaPC 164LX Features
Feature Description
Microprocessor Alpha 21164 microprocessor
(64-bit RISC)
Core logic chip Digital Semiconductor 21174 core logic chip, comprising a single
control chip that provides an interface to system memory and the
PCI bus
Synchronous DRAM (SDRAM)
memory 32MB to 512MB memory array –- Two banks of 128-bit memory; 168-pin unbuffered SDRAM DIMMs with ECC
Caching:
L1 Icache 8KB, direct-mapped instruction cache on the CPU chip
L1 Dcache 8KB, direct-mapped data cache on the CPU chip
L2 Scache 96KB, three-way, set-associative, write-back unified instruction
and data cache on the CPU chip
L3 backup cache Onboard 2MB, direct-mapped, synchronous SSRAM backup
cache with 128-bit data path
I/O and miscellaneous support 32-bit and 64-bit, 33-MHz PCI
Two 64-bit and two 32-bit PCI expansion slots
PCI/IDE control (CMD PCI0646)
Intel 82378ZB PCI-to-ISA bridge chip
Two dedicated ISA expansion slots
SMC FDC37C935 combination controller chip provides control
for diskettes, two UARTs with modem control, parallel port, key-
board, mouse, and time-of-year clock
1MB flash ROM
Firmware Windows NT AlphaBIOS firmware

2–2 Features of the AlphaPC 164LX Motherboard
Figure 2–1 AlphaPC 164LX Jumper/Connector/Component Location
U42
U61
U60
U48 U49
U47
U40
U31 U32 U33
U20 U21 U22
U8 U9
U43
U52
U41
U37
B1
U57 U58 U59
J25
J24
J18
J19
J20
J21
J22
J6
J7
J2J11J10
J9J8J1
J3
J31J30J28J27
J29
J26
J23
J17
J16
J15
J13
J5
J4
Top:
Bottom: Mouse
Keyboard Top:
Bottom: COM1
COM2
FM-05933.AI4
J5 J4
*
*
**
*
*
**
*
*
*
*
*
Denotes Pin #1
*
U10

Features of the AlphaPC 164LX Motherboard 2–3
Table 2–2 AlphaPC 164LX Jumper/Connector/Component List
Item No. Description Item No. Description
B1 RTC battery (CR2032) J25 Hard-drive LED connector
J1 Soft power connector J26 PCI slot 0 (64-bit)
J2 Fan power, enclosure (+12V) J27 System configuration jumpers
J3 Power (+3V, +5V, -5V, +12V, -12V) J28 Flash ROM update enable/disable
jumper
J4 COM1/COM2 (DB9) connectors J29 SROM test port connector
J5 Keyboard/mouse connectors J30 ISA slot 1
J6 EIDE drive 2/3 connector J31 ISA slot 0
J7 EIDE drive 0/1 connector U8 to U10 Cache SRAM (L3)
J8 SDRAM DIMM 0 [0:63] connector U20 to U22 Cache SRAM (L3)
J9 SDRAM DIMM 1 [64:128] connector U31 to U33 Cache SRAM (L3)
J10 SDRAM DIMM 2 [0:63] connector U37 I/O interface and address control
(DSC 21174-CA)
J11 SDRAM DIMM 3 [64:128] connector U40 Microprocessor, socket (DSC Alpha
21164)
J12 Reserved U41 Patch 8K PAL
J13 Parallel I/O connector U42 EIDE controller
J14 Reserved U43 System clock PLL (CY2308)
J15 Diskette (floppy) drive connector U47 Microprocessor clock synthesizer
(MC12439)
J16 PCI slot 3 (32-bit) U48 Serial ROM, socketed (Xilinx
XC17128D)
J17 PCI slot 2 (32-bit) U49 PCI-to-ISA bridge (Intel 82378ZB)
J18 Microprocessor fan/fan sense connec-
tor U52 Combination controller, Super I/O (SMC FDC37C935)
J19 Enclosure fan +12V power connector U57 Flash ROM (1MB)
J20 Speaker connector U58 PCI arbiter PAL
J21 Reset button connector U59 PCI interrupt request PAL
J22 Halt button connector U60 Power controller
J23 PCI slot 1 (64-bit) U61 Power sense
J24 Power LED connector

2–4 Features of the AlphaPC 164LX Motherboard
Power Requirements
2.1 Power Requirements
The AlphaPC 164LX motherboard has a total power dissipation of 100 W, excluding
any plug-in PCI and ISA devices. Table 2–3 lists the power requirement for each dc
supply voltage.
The power supply must be ATX-compliant.
Caution: Fan sensor required. The 21164 microprocessor cooling fan must have
a built-in sensor that will drive a signal if the airflow stops. The sensor is
connected to motherboard connector J18. When the signal is generated,
it resets the system.
2.2 Environmental Requirements
The 21164 microprocessor is cooled by a small fan blowing directly into the chip’s
heat sink. The AlphaPC 164LX motherboard is designed to run efficiently by using
only this fan. Additional fans may be necessary depending upon cabinetry and the
requirements of plug-in cards.
1Values indicated are for an AlphaPC 164LX motherboard with an Alpha 21164 microprocessor
operating at 600 MHz, with 64MB SDRAM, excluding adapter cards and disk drives.
Table 2–3 Power Supply DC Current Requirements
Voltage/Tolerance Current1
+3.3 V dc, ±5% 5.0 A
+5 V dc, ±5% 14.0 A
–5 V dc, ±5% 0 A
+12 V dc, ±5% 1.0 A
–12 V dc, ±5% 100.0 mA

Features of the AlphaPC 164LX Motherboard 2–5
Physical Parameters
The AlphaPC 164LX motherboard is specified to run within the environment listed
in Table 2–4.
2.3 Physical Parameters
The AlphaPC 164LX motherboard is an ATX-size printed-wiring board (PWB) with
the following dimensions:
•Length: 30.48 cm (12.0 in ±0.0005 in)
•Width: 24.38 cm (9.6 in ±0.0005 in)
•Height: 6.86 cm (2.7 in)
Table 2–4 AlphaPC 164LX Motherboard Environmental Requirements
Parameter Specification
Operating temperature 10°C to 40°C (50°F to 104°F)
Storage temperature –55°C to 125°C (–67°F to 257°F)
Relative humidity 10% to 90% with maximum wet bulb temperature 28°C
(82°F) and minimum dew point 2°C (36°F)
Rate of (dry bulb) temperature
change 11°C/hour ±2°C/hour (20°F/hour ±4°F/hour)

2–6 Features of the AlphaPC 164LX Motherboard
Physical Parameters
2.3.1 ATX Hole Specification
Figure 2–2 shows the ATX Hole Specification for the AlphaPC 164LX.
Figure 2–2 ATX Hole Specification
.800
TYP Between
Connectors.650
.500
.400
4.900
1.612
.600
.625
9.600
8.950 6.100
ISA Connector
(2 Places)
PCI Connector
(4 Places)
1.300
11.100
12.000 This ATX hole is not supported
on AlphaPC 164LX board,
however clearance is provided
on side 2.
This ATX hole is not supported
on AlphaPC 164LX board, and no
clearance is provided on side 2.
FM-06012.AI4

Features of the AlphaPC 164LX Motherboard 2–7
Physical Parameters
2.3.2 ATX I/O Shield Requirements
Figure 2–3 shows the ATX I/O shield dimensions for the AlphaPC 164LX.
Figure 2–3 ATX I/O Shield Dimensions
11.15
15.47
4.35
17.95
22.95
23.96
29.10
33.10
9.25
3.58
2.45
5.00 TYP
R 1.00
21.36
16.05
68.4 64.9 24.7
16.7 35.5
43.5
74.8
78.2 85.4 87.2 94.4 98.9
64.91
60.26
51.27 42.28
40.48
34.13
25.14 16.15 14.35
8.00 0.99 9.98
11.78
18.13
19.93
28.92
37.91
44.26
46.06
55.05
64.04
70.39 72.19 81.18 90.17 95.40
14.96
R 1.00
7.19 TYP
FM-05986.AI4

AlphaPC 164LX Jumper Configuration 3–1
3
AlphaPC 164LX Jumper Configuration
The AlphaPC 164LX motherboard has two groups of jumpers located at J27 and J28,
as shown in Figure 2–1. These jumpers set the hardware configuration and boot
options. Figure 3–1 shows these jumper configurations.
3.1 CPU Speed Selection
The clock synthesizer at location U47 makes it possible to change the frequency of
the microprocessor’s system clock output without having to change the clock crystal.
Simply set the system clock divisor jumpers to adjust the frequency of the
microprocessor’s system clock output. These system clock divisor jumpers are
located at J27–1/2 (IRQ3), J27–3/4 (IRQ2), J27–5/6 (IRQ1), and J27–7/8 (IRQ0).
The jumper configuration is set in IRQ3 through IRQ0. These four jumpers set the
speed at power-up as listed in Figure 3–1. The microprocessor frequency divided by
the ratio determines the system clock frequency.
3.2 Bcache Size Jumpers (CF1 and CF2)
The Bcache size jumpers are located at J27–11/12 (CF) and J27–13/14 (CF2). These
jumpers configure the Bcache as specified in Figure 3–1.

3–2 AlphaPC 164LX Jumper Configuration
Bcache Size Jumpers (CF1 and CF2)
Figure 3–1 AlphaPC 164LX Configuration Jumpers
J27 System Configuration Jumpers
IRQ3 1
3
5
7
9
11
13
15
17
19
21
23
25
CF0
CF4
CF5
CF6
CF7
CF1
CF2
CF3
Boot_Option (Default Out)
Reserved (Default Out)
IRQ0
IRQ1
IRQ2
Password Bypass
Not Used
Frequency
466 MHz Ratio IRQ3 IRQ2 IRQ1 IRQ0 Comments
All other combinations
7 In Out Out Out
In In In
In In Out
533 MHz
600 MHz 8 9Out Out
Reserved
Bcache Size Out
Out In
CF1 CF2 Comments
2MB
4MB Out Default
FM-05931.AI4
1
2
32 to 3 In = Enable (Default)
1 to 2 In = Disable
J28 Flash ROM Update Jumper
Reserved (Default Out)
Reserved (Default Out)
Reserved (Default Out)
Default

AlphaPC 164LX Jumper Configuration 3–3
Password Bypass Jumper (CF3)
3.3 Password Bypass Jumper (CF3)
AlphaBIOS provides password protection. However, Password Bypass is provided
for system setup or startup when the AlphaBIOS password is unavailable.
Password Bypass is enabled by inserting jumper CF3 in the J27 System
Configuration Jumper Block. This disables the AlphaBIOS password verification
and enables the user to set up or start up their system without the AlphaBIOS
password. Password Bypass also clears the password.
3.4 Boot Option Jumper (CF7)
The boot option jumper is located at J27–23/24 (CF7). The default position for this
jumper is out (Figure 3–1). This jumper selects the image to be loaded into memory
from the system flash ROM. With the jumper out, the AlphaBIOS Console firmware
is loaded. With the jumper in, the fail-safe booter is loaded. For more information
about the fail-safe booter, refer to Section 8.5.
3.5 Flash ROM Update Jumper (J28)
When J28–2/3 are jumpered together (default), the flash ROM is write-enabled.
When J28–1/2 are jumpered together, the flash ROM is write-protected.

AlphaPC 164LX Connector Pinouts 4–1
4
AlphaPC 164LX Connector Pinouts
This chapter contains pinouts for all of the AlphaPC 164LX connectors. See Figure
2–1 for connector locations.
4.1 PCI Bus Connector Pinouts
Table 4–1 shows the PCI bus connector pinouts.
Table 4–1 PCI Bus Connector Pinouts (Sheet 1 of 2)
Pin Signal Pin Signal Pin Signal Pin Signal
32-Bit and 64-Bit PCI Connectors (J16, J17, J23, J26)
A1 TRST# A2 +12V A3 TMS A4 TDI
A5 Vdd A6 INTA A7 INTC A8 Vdd
A9 —A10Vdd A11 — A12 Gnd
A13 Gnd A14 — A15 RST# A16 Vdd
A17 GNT# A18 Gnd A19 — A20 AD[30]
A21 +3V A22 AD[28] A23 AD[26] A24 Gnd
A25 AD[24] A26 IDSEL A27 +3V A28 AD[22]
A29 AD[20] A30 Gnd A31 AD[18] A32 AD[16]
A33 +3V A34 FRAME# A35 Gnd A36 TRDY#
A37 STOP# A38 STOP# A39 +3V A40 SDONE
A41 SBO# A42 Gnd A43 PAR A44 AD[15]
A45 +3V A46 AD[13] A47 AD[11] A48 Gnd
A49 AD[09] A50 Not used A51 Not used A52 C/BE#[0]
A53 +3V A54 AD[06] A55 AD[04] A56 Gnd
A57 AD[02] A58 AD[00] A59 Vdd A60 REQ64#
A61 Vdd A62 Vdd B1 -12V B2 TCK
B3 Gnd B4 TDO B5 Vdd B6 Vdd
B7 INTB B8 INTD B9 PRSNT1# B10 —