IBM Understanding DOS Memory Map and PC Memory Map

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SurePOS 500 4846-XX5 Technical Reference

3.7EBDA Memory Addresses

The Extended BIOS Data Area (EBDA) starts at the segment pointed to by the contents of 40:0Eh.

Start Location

Length in bytes

Description

Comments

00h

1

Length of EBDA in KB

 

01h

32

Reserved

 

17h

1

Number of POST errors

not required

18h

5

POST error log

not required

22h

4

Mouse Driver Ptr

Int 74h

26h

1

Mouse flag byte 1

Int 74h

27h

1

Mouse flag byte 2

Int 74h

28h

8

Mouse data

Int 74h

30h

3d0h

Reserved

Reserved

3.8Memory Map

This section documents the default memory map. Note that add-in cards or changing CMOS Setup items may alter the memory map, particularly below 1 MB.

Memory Map with USB Legacy Support enabled (default)

Physical

 

Physical

Size

Description

Address Range

 

 

Address Range (Hex)

(Dec)

 

 

 

 

 

 

 

 

 

0-639 KB

 

00000-9FC00

512 KB

Conventional DOS memory (size may decrease if booted

 

via LAN)

 

 

 

 

639 KB

 

9FC00-9FFFF

1 KB

EBDA (Extended BIOS Data) moveable by Himem,

 

memory managers

 

 

 

 

640-767 KB

 

A0000-BFFFF

128 KB

Legacy Video Buffer

 

 

 

 

 

 

768-831 KB

 

C0000-CFFFF

64 KB

Video BIOS ROM (shadowed)

 

 

 

 

 

 

832-863 KB

 

D0000-D7FFF

32 KB

USB Legacy Support

 

 

 

 

 

 

864-867 KB

 

D8000-D8FFF

4 KB

Network ROM boot loader

 

 

 

 

 

 

868-895 KB

 

D9000-DFFFF

28 KB

Free for EMM386

 

 

 

 

 

 

896 KB-959KB

 

E0000-EFFFF

64 KB

Free for EMM386

 

 

 

 

 

 

960KB – 1MB

 

F00000-FFFFFF

64KB

System ROM BIOS

 

 

 

 

 

 

1- 16 MB

 

100000-FFFFFF

15 MB

PCI/ISA Space

 

 

 

 

 

 

16 MB – 4095.5

 

1000000-FFF7FFFF

4079.5

OS, PCI adapter memory decode, etc.

MB

 

MB

 

 

 

 

4095.5 MB - 4096

 

FFF80000-FFFFFFF

512 KB

System ROM BIOS (ISA Bus)

MB

 

 

 

 

 

 

Memory Map with USB Legacy support disabled:

 

 

Physical

Physical

Size

 

Description

Address Range

 

Address Range (Hex)

 

(Dec)

 

 

 

 

 

 

 

 

0-639 KB

00000-9FC00

512 KB

 

Conventional DOS memory (size may decrease if

 

booted via LAN)

 

 

 

 

 

639 KB

9FC00-9FFFF

1 KB

 

EBDA (Extended BIOS Data) moveable by Himem,

 

memory managers

 

 

 

 

 

640-767 KB

A0000-BFFFF

128 KB

 

Legacy Video Buffer

 

 

 

 

 

 

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Contents SurePOS 500 4846-545/565 Technical Reference SurePOS 500 4846-XX5 Technical ReferenceChange History Version Date Change Description 16/07 Initial ReleaseTable of Contents Error! Bookmark not defined Environmental SpecificationsHighlights SpecificationsIntroduction ModelsLAN Related Publications80GB Sata Feature 4846-XX5 4840-XX3/XX4 4851-514 Comparison with predecessor productsProduct Structure Factory Select FeatureKey optional features Ship GroupSystem management Supported DevicesOperating System/POS Driver Support System management programsRemote management System DiagnosticsPhysical Characteristics Dimensions and weights Supported memory keysComponent Weight Measurement a Measurement B See figure belowVisual Indicators ControlsMSR Connector/Controls IdentifierIdentifier Function SurePOS 500 4846-XX5 Technical Reference Product Description Block Diagram South Bridge Intel ICH6 LogicProcessor Intel Celeron D 326 2.53Ghz Subsystem Smsc SC3106 Super I/O ControllerHard Disk Drive Integrated and Distributed 11.3 LCDMagnetic Stripe Reader Inch TFTBIG5 Attribute SpecificationAll Points Addressable APA Display Built-in speakers X6X models only Standard Bios Features Bios and software descriptionSetup Functional StandardsBios Interrupts Fixed Bios Entry Points BDA Memory Addresses SurePOS 500 4846-XX5 Technical Reference Start Location Length in bytes Description Comments Ebda Memory AddressesMemory Map Video Modes COM Port SetupPhysical Tailgate Function Connector Location Default Port TypeCGA Xvga VGASvga SxgaOnboard LCD and one extra attached LCD Display mode and operating system restrictionsDisplay Configuration Definition Operating system with display combinations and restrictionsFunction Supported From State Power Management 3.11.1 APMSupported video resolutions in Windows operating system Acpi System Information Data Smbios Cumulative Structure ListVPD using Int 15h VPD Layout in SmbiosSmbios Type 11 Structure Layout Vital Product DataEnvironmental Specifications Ergonomics and accessibility MpriiExternal Ports Port Power RatingsPort Electrical Interface Connector Type Port ListingPin Connector Connector Pinouts Customer Display ConnectorMSR connector Keyboard, Mouse connector USB Plus PowerUSB port connector Pin Signal Shell ShieldSerial Connector Microphone connectorHeadphone Connector MON ID1 Ethernet connectorExternal video connector MON ID3Internal Customer Display Signal Pin number, RJ45 End Pin number, RS232 endCash Drawer 5 RJ45 to RS232 CableCmos Setup Utility Standard Cmos Features Hard Disk Boot Priority Advanced Bios FeaturesCPU Feature CD-ROM Boot PrioritySecond Boot Device First Boot DeviceQuick Power On Self Test OptionsBoot Other Device Third Boot DeviceFourth Boot Device Alternate Boot SequenceSecurity Option No Setup Touch EntryBoot Up NumLock Status HDD S.M.A.R.T. CapabilityThermal Management Hard Disk Boot PriorityCPU Feature Limit Cpuid MaxVal Execute Disable BitIntegrated Peripherals On-Chip Serial ATASerial Port a IRQ Onboard DeviceSerial Port a I/O Options Serial Port B I/OMSR I/O Options Serial Port D I/OSerial Port D IRQ Options Serial Port D FunctionSerial Port C I/O SurePOS 500 4846-XX5 Technical Reference Touch Screen I/OTouch Screen IRQ Serial Port C IRQUSB 2.0 Controller On Board DeviceUSB Controller USB Keyboard SupportAudio Support Typematic Rate SettingOptions Typematic Delay Msec PC-Beep from SpeakerSuspend Mode Power Management SetupPower Management State After Power Failure HDD Power DownPower Button Mode Time hhmmss Alarm Wake on AlarmDate of Month Alarm SurePOS 500 4846-XX5 Technical Reference OptionsReset Configuration Data PnP/PCI ConfigurationsPNP OS Installed Resources Controlled ByPC Health Status Thermal Profile Thermal ProfileCPU Fan Speed END of Document

500 specifications

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Overall, the IBM 500 combines powerful processing, advanced analytics, robust security, and reliable performance in a single solution. It is a testament to IBM’s dedication to providing cutting-edge technology that meets the needs of modern enterprises, while also allowing them to leverage innovation for sustainable growth. As businesses continue to adapt to digital transformations, the IBM 500 serves as a critical ally in navigating these changes effectively.