IBM PC 300GL Types 6275 Technical document

IBM
Technical Information Manual
PC 300GL (6561 and 6591)

IBM Technical Information Manual
PC 300GL (6561 and 6591)

Note
Before using this information and the product it supports, be sure to read the general information under
Appendix E, “Notices and Trademarks” on page 49.
First Edition (February 1998)
The following paragraph does not apply to the United Kingdom or any country where such provisions are inconsistent with
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product(s) and/or the program(s) described in this publication at any time.
This publication was developed for products and services offered in the United States of America. IBM may not offer the products,
services, or features discussed in this document in other countries, and the information is subject to change without notice. Consult
your local IBM representative for information on the products, services, and features available in your area.
Requests for technical information about IBM products should be made to your IBM reseller or IBM marketing representative.
 Copyright International Business Machines Corporation February 1998. All rights reserved.
Note to U.S. Government Users — Documentation related to restricted rights — Use, duplication or disclosure is subject to
restrictions set forth in GSA ADP Schedule Contract with IBM Corp.

Contents
Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Related Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
Terminology Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Chapter 1. System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Major Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Other Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Wake on LAN .................................................. 2
Wake Up on Ring ................................................ 2
Network Enablement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Chapter 2. System-Board Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Chip Set Control .................................................. 4
L2 Cache . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
System Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PCI Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Bus Master IDE Interface ........................................... 5
PCI-to-ISA Bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
USB Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Video Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Integrated AGP Cirrus GD5465 3-D SVGA (super video graphics array) ................ 7
Video Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Input/Output Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Diskette Drive Support ............................................. 8
Serial Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Parallel Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Keyboard and Mouse Ports .......................................... 9
Network Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
General Purpose I/O Ports ........................................... 10
Real-Time Clock and CMOS .......................................... 10
Flash EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Riser Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Physical Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System Board, Models 6561 and 6591 .................................... 12
Jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Riser Card, Model 6561 ............................................ 13
Riser Card, Model 6591 ............................................ 13
Connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Model 6561 Connector Panel ......................................... 14
Model 6591 Connector Panel ......................................... 14
Chapter 3. Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
PC 300GL Model 6561 .............................................. 16
PC 300GL Model 6591 .............................................. 17
Chapter 4. Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Power Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
PC 300GL Model 6561 ............................................. 18
 Copyright IBM Corp. February 1998 iii

PC 300GL Model 6591 ............................................. 19
Component Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Output Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Connector Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Chapter 5. System Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
BIOS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Plug and Play .................................................... 22
POST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Configuration/Setup Utility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Advanced Power Management (APM) ...................................... 23
Flash Update Utility Program ........................................... 23
Diagnostic Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Chapter 6. System Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Hardware Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Hardware Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Diskette Drives and Controller ......................................... 26
Hard Disk Drives and Controller ........................................ 26
Software Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Software Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Machine-Sensitive Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Appendix A. Connector Pin Assignments .................................. 28
System Memory Connector ............................................ 29
IDE Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
USB Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Monitor Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Diskette Drive Connector ............................................. 32
Serial Port Connectors ............................................... 33
Parallel Port Connector .............................................. 33
Keyboard and Mouse Port Connectors ..................................... 35
ISA Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
PCI Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Wake on LAN and Modem/Ring Wake-up Connectors ............................ 40
Power Supply Connectors ............................................. 40
Appendix B. System Address Maps ..................................... 41
System Memory Map ............................................... 41
Input/Output Address Map ............................................ 41
DMA I/O Address Map ............................................... 43
PCI Configuration Space Map .......................................... 44
Appendix C. IRQ and DMA Channel Assignments ............................ 45
Appendix D. Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
POST Error Codes ................................................. 46
Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Appendix E. Notices and Trademarks .................................... 49
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
iv Technical Information Manual

Figures
1. System Memory Configuration ....................................... 4
2. Serial Port Assignments .......................................... 8
3. Parallel Port Assignments ......................................... 9
4. Riser Card Characteristics ......................................... 11
5. CMOS Clear/Password Jumper ..................................... 12
6. FLASH Recovery Jumper ........................................ 12
7. Size (PC 300GL Model 6561) ....................................... 16
8. Weight (PC 300GL Model 6561) ..................................... 16
9. Cables (PC 300GL Model 6561) ..................................... 16
10. Air Temperature (PC 300GL Model 6561) ................................ 16
11. Humidity (PC 300GL Model 6561) .................................... 16
12. Heat Output (PC 300GL Model 6561) .................................. 16
13. Electrical (PC 300GL Model 6561) .................................... 16
14. Size (PC 300GL Model 6591) ....................................... 17
15. Weight (PC 300GL Model 6591) ..................................... 17
16. Cables (PC 300GL Model 6591) ..................................... 17
17. Air Temperature (PC 300GL Model 6591) ................................ 17
18. Humidity (PC 300GL Model 6591) .................................... 17
19. Heat Output (PC 300GL Model 6591) .................................. 17
20. Electrical (PC 300GL Model 6591) .................................... 17
21. Power Input Requirements ......................................... 18
22. Power Output (145 Watt) .......................................... 18
23. Power Output (200 Watt) .......................................... 19
24. System Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
25. Keyboard Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
26. Auxiliary Device Port ............................................ 20
27. ISA-Bus Adapters (Per Slot) ........................................ 20
28. PCI-Bus Adapters (Per Slot) ........................................ 20
29. Internal DASD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
30. 5.25-Inch Diskette Drive Reading, Writing, and Formatting Capabilities ............... 26
31. 3.5-Inch Diskette Drive Reading, Writing, and Formatting Capabilities ................ 26
32. System Memory Connector Pin Assignments .............................. 29
33. IDE Connector Pin Assignments ...................................... 31
34. USB Connector Pin Assignments ..................................... 32
35. Monitor Connector Pin Assignments ................................... 32
36. Diskette Drive Connector Pin Assignments ................................ 32
37. Serial Port Connectors Pin Assignments ................................. 33
38. Parallel Port Connector Pin Assignments ................................. 33
39. Keyboard and Mouse Connectors Pin Assignments .......................... 35
40. ISA Connector Pin Assignments ...................................... 36
41. PCI Connector Pin Assignments ...................................... 38
42. J27 Modem/Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
43. J28 Wake on LAN .............................................. 40
44. Pin Assignments for Power Supply Connectors ............................. 40
45. System Memory Map ............................................ 41
46. I/O Address Map ............................................... 41
47. DMA I/O Address Map ........................................... 43
48. IRQ Channel Assignments ......................................... 45
49. DMA Channel Assignments ........................................ 45
50. POST Error Codes ............................................. 46
 Copyright IBM Corp. February 1998 v

51. Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
vi Technical Information Manual

Preface
This Technical Information Manual provides information for the IBM PC 300GL (Models 6561 and 6591).
It is intended for developers who want to provide hardware and software products to operate with these
IBM computers and provides an in-depth view of how these IBM computers work. Users of this
publication should have an understanding of computer architecture and programming concepts.
 Copyright IBM Corp. February 1998 vii

Related Publications
In addition to this manual, the following IBM publications provide information related to the operation of the
PC 300GL (Models 6561 and 6591). To order publications in the U.S. and Puerto Rico, call
1-800-879-2755. In other countries, contact an IBM reseller or an IBM marketing representative.

Using Your Personal Computer
This publication contains information about configuring, operating, and maintaining the PC 300GL
(Models 6561 and 6591). Also, information on diagnosing and solving problems, how to get help and
service, and warranty issues is included.

Installing Options in Your Personal Computer
This publication contains instructions for installing options in the PC 300GL Model 6561 or 6591.

Understanding Your Personal Computer
This online document includes general information about using computers and detailed information
about the features of the PC 300GL (Models 6561 and 6591).

PC 300 Systems (6561/6591) Compatibility Report
This publication contains information about compatible hardware and software for the PC 300GL
(Models 6561 and 6591). This publication is available at http://www.pc.ibm.com/us/cdt.

Network Administrator's Guide
This publication contains information for network administrators who configure and service local-area
networks (LANs). Look for this publication at http://www.pc.ibm.com/us/cdt.
viii Technical Information Manual

Terminology Usage
Attention! The term reserved describes certain signals, bits, and registers that should not be changed.
Use of reserved areas can cause compatibility problems, loss of data, or permanent damage to the
hardware. When the contents of a register are changed, the state of the reserved bits must be preserved.
When possible, read the register first and change only the bits that must be changed.
In this manual, some signals are represented in a small, all-capital-letter format (-ACK). A minus sign in
front of the signal indicates that the signal is active low. No sign in front of the signal indicates that the
signal is active high.
The use of the term
hex indicates a hexadecimal number. Also, when numerical modifiers such as “K”,
“M” and “G“ are used, they typically indicate powers of 2, not powers of 10. For example, 1 KB equals
1024 bytes (2 10), 1 MB equals 1048576 bytes (2 20), and 1 GB equals 1073741824 bytes (230).
When expressing storage capacity, MB equals 1000 KB (1024000). The value is determined by counting
the number of sectors and assuming that every two sectors equals 1 KB.
Note: Depending on the operating system and other system requirements, the storage capacity available
to the user might vary.
Preface ix

xTechnical Information Manual

Chapter 1. System Overview
Chapter 1. System Overview
The IBM PC 300GL (Models 6561 and 6591) is a versatile product designed to provide state-of-the-art
computing power with room for future growth. Several model variations are available.
Major Features
The major features are:
Intel Pentium II processor with MMX Technology
512 KB of L2 cache
Up to 256 MB of system memory
Integrated AGP Cirrus GD5465 3-D SVGA (super video graphics array) controller
2 MB of RDRAM video memory standard
Industry-standard compatibility
Network connection
– Ethernet Wake on LAN adapter (some models only)
– Token-ring Wake on LAN adapter (some models only)
ISA/PCI I/O-bus compatibility
ISA/PCI expansion slots
Enhanced IDE drives
Bus master IDE controller, ultra DMA/33 capable
Two 16550-UART serial ports
Two USB ports
One 15-pin monitor port
One parallel port
Ports for keyboard and mouse
Preinstalled 32X Max CD-ROM drive (some models only)
Preinstalled SoundBlaster-compatible audio adapter (some models only)
EnergyStar compliant
Choice of system unit size
– The PC 300GL Model 6561 has four expansion slots and four drive bays
– The PC 300GL Model 6591 has six expansion slots and six drive bays
 Copyright IBM Corp. February 1998 1

Chapter 1. System Overview
Other Features
The following features are supported by the PC 300GL (Models 6561 and 6591). Optional hardware is
required for these features.
Wake on LAN
The power supply of the computer supports the Wake on LAN feature. With the Wake on LAN feature,
the computer can be turned on when a specific LAN frame is passed to the PC over the LAN.
To use the Wake on LAN feature, the computer must be equipped with a network subsystem that supports
Wake on LAN.
The menu used for setting the Wake on LAN feature is found in the Configuration/Setup Utility Program.
Wake Up on Ring
All models are configurable to turn on the computer after a ring is detected from an external or internal
modem. The menu used for setting the Wake Up on Ring feature is found in the Configuration/Setup
Utility Program. Two options control this feature:
Serial Ring Detect: Use this option if the computer has an external modem connected to the serial
port.
Modem Ring Detect: Use this option if the computer has an internal modem.
Network Enablement
The PC 300GL (Models 6561 and 6591) is enabled to support management over the network. The
following is a list of functions that are supported:
Selectable startup sequence
Selectable Automatic Power On Startup Sequence
Update POST/BIOS from network
Wake on LAN
CMOS Save/Restore utility program
CMOS setup over LAN
2Technical Information Manual

Chapter 2. System-Board Features
Chapter 2. System-Board Features
This section includes information about system-board features. For an illustration of the system board,
see “System Board, Models 6561 and 6591” on page 12.
Microprocessor
The microprocessor in the PC 300GL (Models 6561 and 6591) is the Intel Pentium II Processor with MMX
Technology. The microprocessor features are:
Optimization for 32-bit software
Operation at a lower voltage level than previous microprocessors
64-bit microprocessor data bus
32-bit microprocessor address bus
Math coprocessor
MMX technology (boosts the processing of graphic, video, and audio data)
L2 cache integrated into the microprocessor
– 4-way set associative
– Nonblocking
– 50-percent processor speed
– Performance increase over placement of L2 cache on the system board
The microprocessor (which has a heat sink attached) plugs directly into a connector on the system board.
For information on replacing a microprocessor or installing an upgrade, refer to
Installing Options in Your
Personal Computer .
Note: More information on the Intel Pentium II microprocessor can be found on the World Wide Web at
http://www.intel.com.
 Copyright IBM Corp. February 1998 3

Chapter 2. System-Board Features
Chip Set Control
The Intel 440LX and PIIX4 chip set is the interface between the microprocessor and the following:
Memory subsystem
PCI bus
Busmaster IDE connection
High-performance, PCI-to-ISA bridge
USB ports
SMBus
AGP bus
Enhanced DMA controller
RTC
L2 Cache
The L2 cache is contained within the Pentium II processor. It has 512 KB of cache.
System Memory
The system memory interface is controlled by the 440LX chip set. Synchronous dynamic random access
memory (SDRAM) is standard.
The maximum amount of system memory is 256 MB. For memory expansion, the system board provides
two dual inline memory module (DIMM) connectors. DIMM sizes of 16MB, 32MB, 64MB, and 128MB with
a speed of 60ns are supported. The amount of memory preinstalled varies by model.
The following information applies to system memory:
SDRAM (synchronous dynamic random access memory), nonparity memory is standard.
Error correcting code (ECC) nonparity DRAM is also supported.
The maximum height of memory modules is 3.18 cm (1.25 in.).
Only industry-standard, gold-lead DIMMs are supported.
A mix of parity and nonparity types configures as nonparity.
For information on the pin assignments for the memory module connectors, see “System Memory
Connector” on page 29.
The following figure shows some possible configurations for the supported DIMMs.
Figure 1 (Page 1 of 2). System Memory Configuration
Total Memory (MB) MEM 0 MEM 1
16 16 0
32 16 16
32 32 0
48 32 16
64 64 0
64 32 32
80 64 16
96 64 32
128 64 64
4Technical Information Manual

Chapter 2. System-Board Features
PCI Bus
The fully synchronous 33 MHz PCI bus originates in the chip set. Features of the PCI bus are:
Integrated arbiter with multi-transaction PCI arbitration acceleration hooks for high performance
graphics
Built-in PCI bus arbiter with support for up to five masters
Microprocessor-to-PCI memory write posting with 5-Dword-deep buffers
Converts back-to-back sequential microprocessor-to-PCI memory write to PCI burst write
PCI-to-DRAM posting 18 Dwords
PCI-to-DRAM up to 100+ MB/sec bandwidth
Multitransaction timer to support multiple short PCI transactions within one PCI ARB cycle
PCI 2.1 compliant
Delayed transaction
PCI parity checking and generation support
Bus Master IDE Interface
The system board incorporates a PCI-to-IDE interface that complies with the AT Attachment Interface with
Extensions . The subsystem that controls direct access storage devices (DASD) is integrated with the IDE
interface.
The chip set functions as a
bus master for the IDE interface. The chip set is PCI 2.1 compliant; it
connects directly to the PCI bus and is designed to allow concurrent operations on the PCI bus and IDE
bus. The chip set is capable of supporting PIO mode 0–4 devices and IDE DMA mode 0–2 devices, ultra
33 transfers up to 33 Mbytes/sec.
The IDE devices receive their power through a four-position power cable containing +5, +12, and ground
voltage. When adding devices to the IDE interface, one device is designated as the master device and
another is designated as the slave or subordinate device. These designations are determined by switches
or jumpers on each device. There are two IDE ports, one designated 'Primary' and the other 'Secondary',
allowing for up to four devices to be attached.
For the IDE interface, no resource assignments are given in the system memory or the direct memory
access (DMA) channels. For information on the resource assignments, see “Input/Output Address Map”
on page 41 and Figure 48 on page 45 (for IRQ assignments).
Two connectors are provided on the riser for the IDE interface. For information on the connector pin
assignments, see “IDE Connectors” on page 31.
PCI-to-ISA Bridge
On the system board, the chip set provides the interface between the peripheral component interface
(PCI) and industry standard architecture (ISA) buses. The chip set is used to convert PCI bus cycles to
ISA bus cycles; the chip set also includes all the subsystems of the ISA bus, including two cascaded
interrupt controllers, two DMA controllers with four 8-bit and three 16-bit channels, three counters
equivalent to a programmable interval timer, and power management. The PCI bus operates at 33 MHz
Figure 1 (Page 2 of 2). System Memory Configuration
Total Memory (MB) MEM 0 MEM 1
128 128 0
256 128 128
Chapter 2. System-Board Features 5

Chapter 2. System-Board Features
(one-half the microprocessor bus). The ISA bus operates at 8.25 MHz (one-quarter of the PCI bus speed)
with a 66 MHz microprocessor bus.
For the ISA bus, no resource assignments are given in the system memory or the DMA channels. For
information on resource assignments, see “Input/Output Address Map” on page 41 and Figure 48 on
page 45 (for IRQ assignments).
USB Interface
Universal serial bus (USB) technology is a standard feature of the computer. Using the chip set, the
system board provides the USB interface with two connectors. A USB-enabled device can attach to each
connector, and if that device is a hub, multiple peripherals can attach to the hub and be used by the
system. The USB connectors use Plug and Play technology for installed devices. The speed of the USB
is up to 12 MB/sec with a maximum of 127 peripherals.
Features provided by USB technology include:
Support for hot pluggable devices
Support for concurrent operation of multiple devices
Suitable for different device bandwidths
Support for up to five meters length from host to hub or from hub to hub
Guaranteed bandwidth and low latencies appropriate for specific devices
Wide range of packet sizes
Limited power to hubs
For information on the connector pin assignments for the USB interface, see “USB Connectors” on
page 32.
6Technical Information Manual

Chapter 2. System-Board Features
Video Subsystem
The video subsystem on the system board includes the Integrated AGP Cirrus GD5465 3-D SVGA (super
video graphics array) controller. The system board supports up to two RDRAM memory modules. Each
module contains 2 MB of RDRAM memory.
Integrated AGP Cirrus GD5465 3-D SVGA (super video graphics array)
The Integrated AGP Cirrus GD5465 3-D SVGA (super video graphics array) supports all video graphics
array (VGA) modes and is compliant with super video graphics array (SVGA) modes, Video Electronics
Standards Association (VESA) 1.2. Some enhanced features are:
Plug and Play support
533 MHz RAMBUS DRAM support
Advanced Power Management support
Color space conversion
Hardware scaling
AGP bus and is AGP 1.0 compliant. The CL-GD5465 video subsystem supports the VESA Display Data
Channel (DDC) standard 1.1 and uses DDC1 and DDC2B to determine optimal values during automatic
monitor detection.
For information on resource assignments, see Appendix B, “System Address Maps” on page 41 and
Appendix C, “IRQ and DMA Channel Assignments” on page 45.
The video subsystem provides a 15-pin monitor connector on the system board; For information on
connector pin assignments, see “Monitor Connector” on page 32.
Video Memory
The video memory interface is controlled by the GD5465 graphics controller.
The amount of RAMBUS RDRAM shipped with the video subsystem is 2MB.
The video memory module used is a 2MBX9 533MHz RDRAM.
Chapter 2. System-Board Features 7

Chapter 2. System-Board Features
Input/Output Controller
Control of the integrated input/output (I/O) and diskette drive controllers is provided by a single module,
the SMC 37C673. This module, which supports Plug and Play, controls the following features:
Diskette drive support
Serial port
Parallel port
Keyboard and mouse ports
General purpose I/O ports
Diskette Drive Support
A maximum of two diskette drives and one tape backup drive are supported on the system board. The
actual number of diskette drives that can be installed is dependent upon the system unit size (the
PC 300GL Model 6561 has four drive bays for installing internal devices and the PC 300GL Model 6591
has six drive bays for installing internal devices). The following is a list of devices that the diskette drive
subsystem supports:
1.44 MB, 3.5 inch diskette drive
2.88 MB, 3.5 inch diskette drive
1.2 MB, 5.25 inch diskette drive
One connector is provided on the system board for diskette drive support. For information on the
connector pin assignments, see “Diskette Drive Connector” on page 32.
Serial Port
Integrated into the system board are two universal asynchronous receiver/transmitter (UART) serial ports.
The serial ports include a 16-byte data, first-in first-out (FIFO) buffer, and have programmable baud rate
generators. The serial ports are NS16450 and PC16550A compatible.
For information on the connector pin assignments, see “Serial Port Connectors” on page 33.
Note: Current loop interface is not supported.
The following figure shows the serial port assignments used in configuration.
Parallel Port
Integrated in the system board is support for extended capabilities port (ECP), enhanced parallel port
(EPP), and standard parallel port (SPP) modes. The modes of operation are selected through the
Configuration/Setup Utility program with the default mode set to SPP.
The following figure shows the parallel port assignments used in the configuration.
Figure 2. Serial Port Assignments
Port Assignment Address Range (hex) IRQ Level
Serial 1 03F8–03FF IRQ4
Serial 2 02F8–02FF IRQ3
Serial 3 03E8–03FF IRQ4
Serial 4 02E8–02FF IRQ3
8Technical Information Manual