IBM 500 manual Bios Interrupts

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SurePOS 500 4846-XX5 Technical Reference

•Thermal management

3.4BIOS Interrupts

This section lists the supported interrupt in DOS. Refer to the IBM Personal System/2 and Personal Computer BIOS Interface Technical Reference for additional information.

•Int 02h – NMI

•Int 05h - Print Screen

•Memory Location 50:00h.

This is a byte memory location. A value of 00h indicates that the print screen successfully completed or was not invoked. A value of 01h indicates that a print screen is in progress and subsequent print screens are ignored. A value of FFh indicates that the print screen terminated due to an error.

•Int 08h - System Timer

This interrupt modifies memory locations 40:6Ch, 40:70h, 40:40h, and 40:3Fh. It also invokes interrupt 1Ch.

•Memory Location 40:6Ch

This dword is incremented every Int 08h tick or 18.2 times per second. The memory location is reset to 00000000h when a 24-hour duration has elapsed.

•Memory Location 40:70h

This byte has a value of 00h until a 24 hour duration has elapsed. It is then set to 01h. The byte must be manually reset back to 00h.

•Memory Location 40:40h

This byte is decremented every interrupt 08h tick or 18.2 times per second. If the timer goes to 00h, the floppy motor is turned off and resets the floppy flags in memory location 40:3Fh.

•Int 09h – Keyboard

Called on every make or break keystroke. The 32-byte buffer starting at 40:1Eh is updated at the address pointed by the keyboard buffer tail pointer. The keyboard buffer tail pointer at memory location 40:1Ch is incremented by 2 unless it extends past the keyboard buffer, in which case it wraps. When a key is read, the keyboard buffer head pointer at memory location 40:1Ah is incremented by 2 unless it extends pass the keyboard buffer, in which case it wraps. Special keys such as CTRL, ALT, or Shift update the status at memory location 40:17h, 40:18h and 40:96h. A CTRL-ALT-DELETE key sequence sets the reset flag at memory location 40:72h to 1234h and jumps to the reset vector.

Pressing the Pause key causes the interrupt handler to loop until a valid ASCII keystroke occurs. Pressing the Print Screen key causes an Interrupt 05h to be issued.

A CTRL-BREAK sequence causes Interrupt 1Bh to be issued.

Pressing the SysReq key causes Interrupt 15h Function 85h (System Request Key Pressed) to be issued.

Any make keystroke causes Interrupt 15h Function 91h, Subfunction 02h (Interrupt complete from Keyboard) to be issued.

After any scan code is read from I/O port 60h and Int 15h, Function 4Fh (Keyboard Intercept) is issued. An EOI is issued upon returning from the Keyboard Intercept.

•Memory Location 40:1Eh

This location is the start of a 32-byte keyboard buffer.

•Memory Location 40:1Ah

This word points to the next character in the keyboard buffer.

•Memory Location 40:1Ch

This word points to the last character in the keyboard buffer. If the value equals the value in memory location 40:1Ah, the keyboard buffer is empty. If the value is two bytes from the contents of memory location 40:1Ah, the keyboard buffer is full.

•Memory Location 40:17h

This byte contains the keyboard status byte.

•Memory Location 40:18h

This byte contains the extended keyboard status byte.

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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 Models80GB Sata Related PublicationsLAN 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 ControlsIdentifier Function Connector/Controls IdentifierMSR 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 TFTAll Points Addressable APA Display Attribute SpecificationBIG5 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 Memory Map Ebda Memory AddressesStart Location Length in bytes Description Comments 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 restrictionsSupported video resolutions in Windows operating system Power Management 3.11.1 APMFunction Supported From State 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 ListingMSR connector Connector Pinouts Customer Display ConnectorPin Connector Keyboard, Mouse connector USB Plus PowerUSB port connector Pin Signal Shell ShieldHeadphone Connector Microphone connectorSerial 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. CapabilityCPU Feature Hard Disk Boot PriorityThermal Management 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 SpeakerPower Management Power Management SetupSuspend Mode Power Button Mode HDD Power DownState After Power Failure 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 CPU Fan Speed Thermal ProfileThermal Profile 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.
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