Advantech PCA-6275 manuel d'utilisation

PCA-6275 Pentium ® II processor-based PCI/ISA-bus CPU card[...]

ii Copyright notice This document is copyrighted, 1999, by Advantech Co., Ltd. All rights are reserved. Advantech Co., Ltd. reserves the right to make improvements to the products described in this manual at any time without notice. No part of this manual may be reproduced, copied, translated or transmitted in any form or by any means without the p[...]

iii A Message to the Customer Advantech customer services Each and every Advantech product is built to the most exacting specifications to ensure reliable performance in the harsh and demanding conditions typical of industrial environments. Whether your new Advantech equipment is destined for the laboratory or the factory floor , you can be assured[...]

iv Product warranty Advantech warrants to you, the original purchaser , that each of its products will be free from defects in materials and workmanship for one year from the date of purchase. This warranty does not apply to any products which have been repaired or altered by persons other than repair personnel authorized by Advantech, or which hav[...]

v Initial Inspection Before you begin installing your card, please make sure that the following materials have been shipped: • 1 PCA-6275 Dual Pentium ® II single board computer • 2 Pentium II CPUs and 2 cooling fans (optional) • 1 PCA-6275 user's manual • 1 bus master & BIOS utility driver • 2 disks, for OBS W in95 drivers • [...]

vi Contents Chapter 1 Hardware Configuration .............................. 1 1.1 Introduction ........................................................................ 2 1.2 Features ............................................................................... 3 1.3 Specifications ..................................................................[...]

vii 2.5 A TX Power Control Connectors (CN6 and J3) ............. 26 2.5.1 A TX feature connector (CN6) and soft power switch connector (J3) ............................................................. 26 2.5.2 Controlling the soft power switch ............................. 27 2.6 Floppy Drive Connector (CN7) .......................................[...]

viii 3.4.1 1 PCI/VGA Palette Snoop .......................................... 37 3.4.12 OS Select for DRAM > 64 MB ............................... 37 3.4.13 V ideo BIOS Shadow ............................................... 37 3.4.14 C8000-CBFFF Shadow / DC000-DFFFF Shadow . 37 3.5 Chipset Features Setup .........................................[...]

ix B.3 External Keyboard Connector (CN17) .......................... 64 B.4 A TX Feature Connector (CN6) ....................................... 65 B.5 IDE Hard Drive Connector (CN1, CN2) ........................ 65 B.6 USB Connector (CN4) ..................................................... 66 B.7 CPU Fan Power Connectors (CN8, CN9) .............[...]

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Hardware Configuration This chapter gives background information on the PCA-6275. It then shows you how to configure the card to match your application and prepare it for installation into your PC. Sections include: • Card specifications • Board layout • Safety precautions • Jumper settings 1 CHAPTER[...]

2 PCA-6275 User's Manual 1.1 Introduction The PCA-6275 industrial grade CPU card uses two of Intel's highly acclaimed Pentium ® II processors, together with the Intel 440BX PCI chipset. The card works with standard ISA or PCI/ISA-bus passive backplanes. The CPU provides 512 KB on-chip L2 cache, eliminating the need for external SRAM chip[...]

Chapter 1 Hardware Configuration 3 1.2 Features • Intel slot 1architecture • Dual Pentium ® II processors up to 500 MHz • Intel 82440BX PCIset, FSB 66/100 MHz • Three DIMM sockets to support Intel PC100-compliant SDRAMs up to 768 MB; supports ECC • A ward Flash BIOS, 2 Mbit • On-board A TX power control connector to meet ACPI requireme[...]

4 PCA-6275 User's Manual 1.3 Specifications System • CPU : Intel Pentium ® II up to 500 MHz • BIOS : A ward Flash BIOS, 2 Mbit • Green function : Supports power management operation via BIOS. Activated by keyboard or mouse activity • PCI enhanced IDE hard disk drive interface : Supports up to four IDE (A T bus) large hard disk drives [...]

Chapter 1 Hardware Configuration 5 • Serial ports : T wo RS-232 ports with 16C550 UAR T s (or compatible) with 16-byte FIFO buffer . Supports speeds up to 1 15.2 Kbps. Ports can be individually configured to COM1, COM2 or disabled • Keyboard and PS/2 mouse connector : A 6-pin mini DIN connector is located on the mounting bracket for easy connec[...]

6 PCA-6275 User's Manual 1.4 Board Layout: Main Features A TX power control connector Bi-directional parallel port Accommodates three DIMM modules, up to 768 MB Intel Pentium ® II processor up to 500 MHz Intel 82440BX PCIset PS/2 mouse & keyboard connector USB port EIDE connector COM1 connector COM2 connector Metal bracket for stability F[...]

Chapter 1 Hardware Configuration 7 1.5 Jumpers and Connectors Connectors on the PCA-6275 board link it to external devices such as hard disk drives and a keyboard. In addition, the board has a number of jumpers used to configure your system for your application. The tables below list the function of each of the board jumpers and connectors. Later s[...]

8 PCA-6275 User's Manual T able 1-2: Connectors Label Function CN1 Primary IDE connector CN2 Secondary IDE connector CN3 Infrared (IR) connector CN4 USB port CN5 Parallel port CN6 A TX feature connector CN7 Floppy driver connector CN8 CPU 2 fan power connector CN9 CPU 1 fan power connector CN10 External speaker CN1 1 Keyboard lock and power LE[...]

Chapter 1 Hardware Configuration 9 1.6 Board Layout: Jumper and Connector Locations Figure 1-1: Board layout: jumper and connecter locations DI MM3 DI MM2 DI MM1 CN 2 CN 1 CN 8 CN 7 CN 3 CN 4 CN 15 CN 16 CN 18 CN 17 SLO T 1 Secondar y SLO T 1 Primar y 44 0 B X CN 11 CN 14 J4 CN 13 RT1 RT2 CN 6 CN 12 J2 J3 CN 10 CN 8 CN 9[...]

10 PCA-6275 User's Manual 1.7 Safety Precautions W arning! Alwa ys completely disconnect the power cord from your chassis whene v er y ou work with the hardware. Do not make connections while the po wer is on. Sensitive electronic components can be damaged by sudden po wer surges . Only e xperienced electronics personnel should open the PC cha[...]

Chapter 1 Hardware Configuration 11 1.8 Jumper Settings This section provides instructions on how to configure your card by setting jumpers. It also includes the card's default settings and your options for each jumper . 1.8.1 How to set jumpers Y ou configure your card to match the needs of your application by setting jumpers. A jumper is the[...]

12 PCA-6275 User's Manual T able 1-3: CPU core frequency (J1) 1-2 3-4 5-6 233 MHz closed closed closed 266 MHz open open open 300 MHz open open closed 333 MHz open closed open 350 MHz closed closed closed 400 MHz open open open 450 MHz open open closed 500 MHz open closed open 246 13 5 13 5 24 6 2 4 6 135 2 46 1 35 135 24 6 24 6 13 5 13 5 246 [...]

Chapter 1 Hardware Configuration 13 1.8.3 Watchdog timer output (J2) The PCA-6275 contains a watchdog timer that will reset the CPU or send a signal to IRQ11 in the event the CPU stops processing. This feature means the PCA-6275 will recover from a software failure or an EMI problem. The J2 jumper settings control the outcome of what the computer w[...]

14 PCA-6275 User's Manual 1 . 9 System Memory The top-left edge of the PCA-6275 contains three sockets for 168-pin dual inline memory modules (DIMMs). All three sockets use 3.3 V unbuffered synchronous DRAMs (SDRAM). DIMMs are available in capacities of 16, 32, 64, 128, or 256 MB. The sockets can be filled in any combina- tion with DIMMs of an[...]

Chapter 1 Hardware Configuration 15 1.9.2 Supplementary information about DIMMs Your PCA-6275 can accept SDRAM memory chips (with or without parity). Also note: • If the PCA-6275 operates at 100 MHz, only use PC100- compliant DIMMs. Most systems will not even boot if non- compliant modules are used. This is due to strict timing issues involved st[...]

16 PCA-6275 User's Manual 1.10 Memory Installation Procedures To install DIMMs, first make sure the two handles of the DIMM socket are in the "open" position. i.e. The handles remain outward. Slowly slide the DIMM module along the plastic guides on both ends of the socket. Then press the DIMM module right down into the socket, until [...]

Chapter 1 Hardware Configuration 17 1.11 Cache Memory Since the second level cache has been embedded into the Pentium ® II CPU, you do not have to take care of either SRAM chips or SRAM modules. The built-in second level cache in the Pentium II yields much higher performance than the external cache memories. The cache size in the Pentium II CPU is[...]

18 PCA-6275 User's Manual 1.12 Mounting the CPU and Cooling Modules The Pentium ® II is a module-type CPU which runs at high speeds, for example 450 MHz, so the cooling mechanism becomes critical for system reliability. There are two types of cooling methods. one with a cooling fan attached to the heat sink of the Pentium II module, the other[...]

Chapter 1 Hardware Configuration 19 Figure 1-4: Mounting CPU and cooling modules - Step 2 Step 2[...]

20 PCA-6275 User's Manual Figure 1-5: Mounting CPU and cooling modules - Step 3 Step 3[...]

Chapter 1 Hardware Configuration 21 1.13 On-board Support Bracket Advantech's PCA-6275 Pentium ® II also includes an on- board metal bracket to provide balanced support for the Pentium II processor cartridge. Figure 1-6: On-board support bracket[...]

22 PCA-6275 User's Manual[...]

Connecting Peripherals This chapter tells how to connect peripherals, switches and indicators to the PCA-6275 board. Y ou can access most of the connectors from the top of the board while it is installed in the chassis. If you have a number of cards installed, or your chassis is very tight, you may need to partially remove the card to make all the [...]

24 PCA-6275 User's Manual 2.1 Primary (CN1) and Secondary (CN2) IDE Connectors Y ou can attach up to four IDE (Integrated Device Electronics) drives to the PCA-6275’ s internal controller . The primary (CN1) and secondary (CN2) connectors can each accommodate two drives. W ire number 1 on the cable is red or blue and the other wires are gray[...]

Chapter 2 Connecting Peripherals 25 2.3 USB Connector (CN4) The PCA-6275 CPU card provides one USB (Universal Serial Bus) interface, which give complete plug and play , hot attach/detach for up to 127 external devices.The USB interface complies with USB Specification Rev . 1.0, and is fuse-protected. The USB interface is accessed through a 10-pin f[...]

26 PCA-6275 User's Manual 2.5 A TX Power Control Connectors (CN6 and J3) 2.5.1 A TX feature connector (CN6) and soft power switch connector (J3) The PCA-6275 can support an advanced soft power switch function if an A TX power supply is used. T o enable the soft power switch function: 1. T ake the specially designed A TX-to-PS/2 power cable out[...]

Chapter 2 Connecting Peripherals 27 2.6 Floppy Drive Connector (CN7) Y ou can attach up to two floppy disk drives to the PCA-6275's on-board controller . Y ou can use any combination of 5.25" (360 KB/1.2 MB) and/or 3.5" (720 KB/1.44/2.88 MB) drives. The card comes with a 34-pin daisy-chain drive connector cable. On one end of the cab[...]

28 PCA-6275 User's Manual 2.8 Front Panel Connectors (CN10, CN1 1, CN12, CN13 and J3) There are several external switches to monitor and control the PCA-6275. 2.8.1 External speaker (CN10) CN10 is a 4-pin connector for an extenal speaker connection. If there is no external speaker , the PCA-6275 provides an on-board buzzer as an alternative. T[...]

Chapter 2 Connecting Peripherals 29 2.9 External Suspend Switch Lead (SMI) (CN14) This allows the user to manually place the system into a suspend mode or "Green" mode when the system is not in use. System activity is decreased to save electricity and prolong the life of certain components. The 2-pin connector connects to the case-mounted[...]

30 PCA-6275 User's Manual 2.1 1 External Keyboard Connector (CN17) In addition to the keyboard connector on the PCA-6275's rear plate, there is also an extra on-board external keyboard connector . This gives system integrators greater flexibility in designing their systems. 2.12 PS/2 Keyboard & Mouse Connector (CN18) The PCA-6275 boar[...]

Award BIOS Setup This chapter describes how to set the card’ s BIOS configuration data. CHAPTER 3[...]

32 PCA-6275 User's Manual 3.1 Introduction A ward’ s BIOS ROM has a built-in setup program that allows users to modify the basic system configuration. This type of information is stored in battery-backed RAM so that it retains the setup information when the power is turned off. 3.2 Entering Setup T urn on the computer and check for the "[...]

Chapter 3 Award BIOS Setup 33 3.3 Standard CMOS Setup Choose the “ST ANDARD CMOS SETUP” option from the "INITIAL SETUP SCREEN" menu, and the screen below will be displayed. This standard setup menu allows users to configure system components such as date, time, hard disk drive, floppy drive, display , and memory . Figure 3-1: CMOS set[...]

34 PCA-6275 User's Manual 3.4 BIOS Features Setup The “BIOS FEA TURES SETUP” screen appears when choosing the "BIOS FEA TURES SETUP" item from the "CMOS SETUP UTILITY" menu. It allows the user to configure the PCA-6275 according to his particular requirements. Below are some major items that are provided in the BIOS FEA[...]

Chapter 3 Award BIOS Setup 35 3.4.2 Quick Power On Self T est This option speeds up the Power-On Self T est (POST) conducted as soon as the computer is turned on. When enabled, BIOS shortens or skips some of the items during the test. When disabled, the computer conducts normal POST procedures. 3.4.3 Boot Sequence This function determines the seque[...]

36 PCA-6275 User's Manual 3.4.5 Boot Up NumLock Status The default is “On”. On Keypad boots up to number keys. Of f Keypad boots up to arrow keys. 3.4.6 Gate A20 Option Normal The A20 signal is controlled by the keyboard controller or chipset hardware. Fast (Default) The A20 signal is controlled by Port 92 or the chipset specific method. 3[...]

Chapter 3 Award BIOS Setup 37 Note: T o disable security , select "P ASSWORD SETTING" in the main menu. At this point, you will be ask ed to enter a pass w ord. Simply press <Enter> to disable security . When security is disabled, the system will boot, and you can enter Setup freely . 3.4.1 1 PCI/VGA Palette Snoop Some display cards[...]

38 PCA-6275 User's Manual 3.5 Chipset Features Setup By choosing the “CHIPSET FEA TURES SETUP” option from the INITIAL SETUP SCREEN menu, the screen below will be displayed. This sample screen contains the manufacturer ’ s default values for the PCA-6275. If you enable the OBS function, you can view the temperature, fan speed and voltage[...]

Chapter 3 Award BIOS Setup 39 3.6 Power Management Setup The power management setup controls the CPU card's “green” features. The following screen shows the manufacturer ’ s defaults. Figure 3-4: Power management setup screen 3.6.1 Power Management This option allows you to determine if the values in power management are disabled, user-d[...]

40 PCA-6275 User's Manual 3.6.3 Soft-Off by PWR-BTTN If you choose "Instant-Off", then pushing the A TX soft power switch button once will switch the system to "system off" power mode, whereas pushing the button again will put the system in "system on" mode. Y ou can choose "Delay 4 sec." If you do, then[...]

Chapter 3 Award BIOS Setup 41 3.7.1 IRQ-xx assigned to : PCI/ISA PnP These fields indicate whether or not the displayed IRQ for each field is being used by a legacy (non-PnP) card. T wo options are available: PCI/ISA PnP or Legacy ISA. The first option, the default setting, indicates that the displayed IRQ is not used to determine if an ISA card is[...]

42 PCA-6275 User's Manual 3.8 Load BIOS Defaults “Load BIOS Defaults” indicates the most appropriate values for the system parameters for stability . These default values are loaded automatically if the stored record created by the setup program becomes corrupted (and therefore unusable). 3.9 Load Setup Defaults “Load SETUP Defaults” l[...]

Chapter 3 Award BIOS Setup 43 3.1 1 Password Setting T o change the password: 1. Choose the "P ASSWORD SETTING" option from the Setup main menu and press <Enter>. The screen will display the following message: Press <Enter>. 2. If the CMOS is good or if this option has been used to change the default password, the user is aske[...]

44 PCA-6275 User's Manual 3.13 Save & Exit Setup If you select this and press <Enter>, the values entered in the setup utilities will be recorded in the CMOS memory of the chipset. The microprocessor will check this every time you turn your system on and compare this to what it finds as it checks the system. This record is required f[...]

On-board Security Setup This chapter explains OBS concepts and provides instructions for installing the relevant software drivers. This is done using the OBS driver disks included in your PCA-6275 package. CHAPTER 4[...]

46 PCA-6275 User's Manual 4.1 Introduction On-board security (OBS) functions monitor key hardware. They help you maintain your system's stability and durability . The PCA-6275 can monitor 5 sets of system positive voltages, 2 sets of system negative voltages, CPU cooling fan speed, and CPU temperature. The positive system voltage sets whi[...]

Chapter 4 On-board Security Setup 47 4.3 Driver Installation 4.3.1 Necessary prerequisites The instructions in this manual assume that you understand elementary concepts of MS-DOS and the IBM personal computer . Before you attempt to install any driver or utility , you should know how to copy files from a floppy disk to a directory on the hard disk[...]

48 PCA-6275 User's Manual 4.3.3 Windows 95 drivers setup procedure 1. Insert the OBS driver disk into drive A:. T ype: A:setup.exe Press <Enter> to run the driver SETUP program. Figure 4-1: Hardware Doctor setup - initial screen[...]

Chapter 4 On-board Security Setup 49 2. If your operating system is W in95, you will see the following screen images after running the driver . Y ou must then reboot your system, start the procedure from Step 1 again, and then proceed directly to Step 3. Figure 4-2: Setup under Win95[...]

50 PCA-6275 User's Manual Figure 4-3: Restarting Windows[...]

Chapter 4 On-board Security Setup 51 3. Follow the screen instructions to install the software. Figure 4-4: Hardware Doctor setup - installation screen[...]

52 PCA-6275 User's Manual 4. Complete the setup. Figure 4-5: Hardware Doctor setup - completion screen[...]

Chapter 4 On-board Security Setup 53 5. Using your file manager , click on "Hardware Doctor" in drive C:, and then click on "W83781". Figure 4-6: Exploring - Hardware Doctor[...]

54 PCA-6275 User's Manual 6. It is recommended that you load the default values for all the OBS settings. However , if desired, you can establish new conditions for voltage, fan speed and temperature. Figure 4-7: Winbond Hardware Doctor[...]

Chapter 4 On-board Security Setup 55 7. "W inbond Hardware Doctor" will show an icon on the right side of the bottom window bar . This icon is the "T erminate and Stay Resident" (TSR) icon. It will permanently remain in the bottom window bar , and will activate warning signals when triggered by the on-board security system. Figu[...]

56 PCA-6275 User's Manual 8. Click on "Setting", then "Monitoring Config." While enabling each OBS function, you can choose "Faults 1". This will result in a warning message being delivered as soon as any monitored reading exceeds safe limits for the first time. Alternatively , you can set up "Count 3". [...]

Chapter 4 On-board Security Setup 57 9. After completing the setup, all the OBS functions are permanently enabled. When a monitored reading exceeds safe limits, a warning message will be displayed and an error beep tone will activate to attract your attention. Figure 4-10: W arning display[...]

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Programming the W atchdog Timer The PCA-6275 is equipped with a watchdog timer that resets the CPU or generates an interrupt if processing comes to a standstill for any reason. This feature ensures system reliability in industrial standalone or unmanned environments. A APPENDIX[...]

60 PCA-6275 User's Manual A.1 Programming the W atchdog Timer T o program the watchdog timer, you must write a program which writes I/O port address 443 (hex). The output data is a time interval value. The value range is from 01 (hex) to 3F (hex), and the related time interval is 1 sec. to 63 sec. Data Time Interval 01 1 sec. 02 2 sec. 03 3 se[...]

Appendix A Programming the Watchdog Timer 61 After data entry , your program must refresh the watchdog timer by rewriting I/O port 443 (hex) while simultaneously setting it. When you want to disable the watchdog timer , your program should read I/O port 443 (hex). The following example shows how you might program the watchdog timer in BASIC: 10 REM[...]

62 PCA-6275 User's Manual[...]

Pin Assignments This appendix contains information of a detailed or specialized nature. It includes: • COM1/COM2 RS-232 serial port • Keyboard and mouse connector • External keyboard connector • A TX feature connector • IDE hard drive connector • USB connector • CPU fan power connector • Floppy drive connector • Parallel port conn[...]

64 PCA-6275 User's Manual B.1 COM1/COM2 RS-232 Serial Port (CN15, CN16) T able B-1: COM1/COM2 RS-232 serial port (CN15, CN16) Pin Signal 1 DCD 2 RXD 3 TXD 4 DTR 5 GND 6 DSR 7R T S 8 CTS 9R I B.2 Keyboard and Mouse Connnector (CN18) T able B-2: Keyboard and mouse connector (CN18) Pin Signal 1 KB DA T A 2 MS DA T A 3 GND 4V CC 5 KB CLOCK 6 MS CL[...]

Appendix B Pin Assignments 65 B.4 A TX Feature Connector (CN6) T able B-4: A TX feature connector (CN6) Pin Signal 1 5VSB 2 VCC 3 PS-ON B.5 IDE Hard Drive Connector (CN1, CN2) T able B-5: IDE hard drive connector (CN1, CN2) Pin Signal Pin Signal 1 IDE RESET* 2 GND 3D A T A 7 4 D A T A 8 5D A T A 6 6 D A T A 9 7 DA T A 5 8 DA T A 10 9 D ATA 4 1 0 D [...]

66 PCA-6275 User's Manual B.6 USB Connector (CN4) T able B-6: USB1/USB2 connector (CN4) Pin USB1 Signal Pin USB2 Signal 1 +5 V 2 +5 V 3 UV- 4 UV- 5 UV+ 6 UV+ 7 GND 8 GND 9 Chassis GND 10 Key B.7 CPU Fan Power Connectors (CN8, CN9) T able B-7: CPU fan power connector (CN8/9) Pin Signal 1 GND 2 +12 V 3 Detect 1 9 2 10 123[...]

Appendix B Pin Assignments 67 B.8 Floppy Drive Connector (CN7) T able B-8: Floppy drive connector (CN7) Pin Signal Pin Signal 1 GND 2 DENSITY SELECT* 3 GND 4 N/C 5 GND 6 N/C 7 GND 8 INDEX* 9 GND 10 MOT OR 0* 1 1 GND 12 DRIVE SELECT 1* 13 GND 14 DRIVE SELECT 0* 15 GND 16 MOT OR 1* 17 GND 1 8 DIRECTION* 19 GND 2 0 STEP* 21 GND 22 WRITE DA T A* 23 GND[...]

68 PCA-6275 User's Manual B.9 Parallel Port Connector (CN5) T able B-9: Parallel port connector (CN5) Pin Signal 1 STROBE 2 AUTOFD 3D 0 4 ERR 5D 1 6 INIT 7D 2 8 SLCTINI 9D 3 10 GND 11 D 4 12 GND 13 D5 14 GND 15 D6 16 GND 17 D7 18 GND 19 ACK 20 GND 21 BUSY 22 GND 23 PE 24 GND 25 SLCT 26 N/C 13 12 .... 2 1 26 25 .... 15 14[...]

Appendix B Pin Assignments 69 B.10 IR Connector (CN3) T able B-10: IR connector (CN3) Pin Signal 1 +5 V 2 N/C 3 IR_RX 4 GND 5 IR_TX B.1 1 HDD LED Connector (CN12) T able B-1 1: HDD LED connector (CN12) Pin Signal 1V CC 2 LED B.12 Power LED and Keylock Connector (CN1 1) Y ou can use an LED to indicate when the CPU card is on. Pin 1 of CN1 1 supplies[...]

70 PCA-6275 User's Manual B.13 External Speaker (CN10) The CPU card has its own buzzer . Y ou can also connect it to the external speaker on your computer chassis. T able B-13: External speaker (CN10) Pin Function 1 +5 V CC 2 GND 3 Internal buzzer 4 Speaker out[...]

Appendix B Pin Assignments 71 B.14 System I/O Ports T able B-14: System I/O ports Addr . range (Hex) Device 000-01F DMA controller 020-021 Interrupt controller 1, master 022-023 Chipset address 040-05F 8254 timer 060-06F 8042 (keyboard controller) 070-07F Real-time clock, non-maskable interrupt (NMI) mask 080-09F DMA page register 0A0-0BF Interrupt[...]

72 PCA-6275 User's Manual B.15 DMA Channel Assignments T able B-15: DMA channel assignments Channel Function 1 Available 2 Floppy disk (8-bit transfer) 3 Available 4 Cascade for DMA controller 1 5 Available 6 Available 7 Available B.16 Interrupt Assignments T able B-16: Interrupt assignments Priority Interrupt# Interrupt source 1 NMI Parity er[...]

Appendix B Pin Assignments 73 B.17 1st MB Memory Map T able B-17:1st MB memory map Addr . range (Hex) Device F0000h - FFFFFh System ROM C8000h - EFFFFh Unused C0000h - C7FFFh VGA BIOS B8000h - BFFFFh CGA/EGA/VGA text B0000h - B7FFFh Unused A0000h - AFFFFh EGA/VGA graphics 00000h - 9FFFFh Base memory[...]

74 PCA-6275 User's Manual[...]