AlphaPC 264DP Motherboard

World class performance for embedded applications

By offering unrivaled performance, the AlphaPC 264DP dual-
processor motherboard provides an easy, cost-effective solution 
for companies developing high-performance embedded products.

Alpha motherboards are designed to use standard PC components such 
as synchronous DRAM (SDRAM) DIMMs and PCI option cards. The 
AlphaPC 264DP offers PCI and ISA slots, onboard PCI IDE, a dual-
port Ultra Wide SCSI controller, and 16 SDRAM DIMMs providing 
access to up to 4 gigabytes of memory. The mainboard contains the 
system chipset, main memory, and all I/O logic. Each daughtercard 
contains a 500-MHz Alpha 21264 microprocessor and L2 cache. One or 
two daughtercards may be used for uniprocessor or dual-processor 
configurations.

The AlphaPC 264DP motherboard provides a dramatic performance 
advantage to embedded applications such as CAT, MRI, 
telecommunication switches, and simulators. At two times the 
performance of its nearest competitor, this product provides the 
ultimate in performance at a competitive cost. OEMs who implement 
the AlphaPC 264DP in their products position themselves as 
providers of the industry's most advanced technology solutions.

The AlphaPC 264DP motherboard integrates Compaq Computer 
Corporation's engineering excellence, quality, and performance, 
keeping Alpha products ahead of the competition.

Hardware features
*
AlphaPC 264DP mainboard supports one or two daughtercards. Each 
daughtercard contains:
- One Alpha 21264 microprocessor operating at a speed of 500 MHz
- A 2 MB, 128-bit L2 cache with late-write HSTL synchronous static 
  RAM (SSRAM)
*
The 21272 core logic chipset on the mainboard interfaces to the 
CPUs, main memory, and dual PCI buses
*
SDRAM memory subsystem includes:
- 128 MB to 4 GB memory complement with 72-bit ECC
- Four memory arrays, each consisting of four 200-pin, 72-bit 
  buffered SDRAM DIMMs
- Memory speed support of 83.3 MHz
*
PCI bus support (33 MHz):
- Six (6) 64-bit slots (one shared with ISA slot)
*
Integrated PCI peripheral 
support:
- Integrated Adaptec(TM) AIC-7895 dual-port, Ultra Wide SCSI 
  controller
- PCI-to-ISA bridge using a Cypress(TM) 82C693UB hyperCache(TM) 
  chip providing:
	 PCI IDE for two devices (PIO mode 4)
	 Keyboard/mouse control and time-of-year clock
*
ISA bus support:
- One dedicated ISA expansion slot (shared with the 32-bit PCI 
  slot)
*
Integrated ISA peripheral support:
- SMSC(TM) FDC37C665 combination controller chip provides diskette 
  control (2.88 MB), two serial port UARTs with modem control, and 
  a parallel port
*
Daughtercard has onboard 
5.0-V to 2.0-V voltage regulation for CPU, and 3.3-V to 1.5-V 
voltage regulation for SSRAM:
- The mainboard supplies +3.3 V
- A separate power connector supplies +5.0 V
*
Daughtercard has onboard Flash ROM for 21264 Alpha microprocessor 
SROM support

Software features
*
Windows NT(TM) Alpha BIOS firmware, which supports installation of 
Windows NT Server 4.0 (Windows NT Server operating system 
purchased separately)

Warranty
*
One year

The AlphaPC 264DP consists of the mainboard and one or two 
daughtercards. 

Documentation and firmware are available separately.

Ordering information
Product                         Order number
AlphaPC 264DP mainboard         21A06-B0
AlphaPC 264DP daughtercard 
with 500-MHz CPU and 2 MB 
L2 cache                        21A06-M0

AlphaPC 264DP characteristics
Characteristic                  Specification
Power supply                    650-W minimum PC power supply 
                                providing +3.3 V, +12.0 V, -12.0 V 
                                and +5.0 V 
Operating temperature range     10C to 35C 
                                (50F to 95F)
Storage temperature range       -55C to 125C 
                                (-67F to 257F)
Board sizes
Mainboard                       42.11 cm x 33.02 cm 
                                (16.58 in x 13.0 in)
Daughtercard                    30.48 cm x 14.99 cm 
                                (12.0 in x 5.9 in)

Related products and documentation
Product                         Order number
Motherboard Software Developer's Kit 
(SDK) and Firmware Update       QR-21B02-04
AlphaPC 264DP User's Manual     EC-RB0BA-TE
AlphaPC 264DP Technical 
Reference Manual                EC-RB0DA-TE

For more information
To learn more about the availability of the AlphaPC 264DP, contact 
your local sales office. To learn more about Compaq Computer 
Corporation's portfolio of Alpha board products, visit the Alpha 
OEM World Wide Web Internet site: www.digital.com/alphaoem

Compaq believes the information in this publication is accurate as 
of its publication date; such information is subject to change 
without notice.  

Compaq is not responsible for any inadvertent errors.  

Compaq conducts its business in a manner that conserves the 
environment and protects the safety and health of its employees, 
customers, and the community.  

Compaq, the Compaq logo, and AlphaPC are registered in United 
States Patent and Trademark Office.

Adaptec is a trademark of Adaptec, Inc. 

Cypress and hyperCache are trademarks of Cypress Semiconductor 
Corporation. 

Microsoft is a registered trademark and Windows NT is a trademark 
of Microsoft Corporation. 

SMSC is a trademark of Standard Microsystems Corporation. 

Other product names mentioned herein may be trademarks and/or 
registered trademarks of their respective companies.

Printed in U.S.A. EC-F9643-56 Rel. # 114/98 12 64 2.5 Copyright 
1998 Compaq Computer Corporation. All Rights Reserved.