IBM Technical Disclosure Bulletins
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List of PS/2 and Micro Channel related Technical Disclosure Bulletins. Please note that this collection is not complete by any means. If you find any other relevant bulletins please Contact Us.

Please keep in mind that the primary purpose of these articles is not to describe the discussed topics with absolute accuracy, but rather to act as a defensive publication - in other words, to prevent IBM's competition from obtaining patents on the discussed "inventions". Therefore, some technical details may differ from the actual implementation! Some of the provided information is also covered by the official technical references, patents, and other documents.

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The bulletins are also kept on file with Patent & Trademark Offices and U.S. Government Depository Libraries. Searching/copying services are NOT provided by any PTO or Government office.

See (*) & (*) for archived Delphion TDB pages (complete text, but many articles are missing unfortunately).

List compiled by Tomáš Slavotínek. Last update: 01 Apr 2021.


DateTitleIP.comSubject, Notes
Jun 1987LOOP Power-On-Self-Test Diagnostics[link]
Sep 1987Interrupt Arbitration in Personal Computer Systems[link]
Oct 1987Interrupt Arbitration to Prevent Data Overrun[link]
Oct 1987Diagnostic Status for Non-Maskable Interrupt Arbitration[link]
Oct 1987Dynamic Relocation of Memory (For Error Recovery)[link]POS
Nov 1987Input/Output Address Space Sharing for Personal Computers[link]
Dec 1987Bus Data Transfer Controls for Personal Computers[link]
Dec 1987A Summing Circuit Bus for Attaching Audio Devices to Personal Computers[link]


DateTitleIP.comSubject, Notes
Jan 1988Auxiliary Video Connector[link]
Apr 1988Level-Sensitive Interrupt for a Parallel Printer Interface Using Data and Status I/O for Reset[link]
Apr 1988Watch Dog Timer Interface[link]
Apr 1988ROM Activated Zero Wait States for Computer Memory Address Ranges[link]
Apr 1988Row Address Select Multiplexing of Computer Memory[link]
May 1988Memory Image Mapping for Personal Computer Systems[link]
May 1988Synchronization Control Block Posting Mechanism[link]SCB
Jun 1988Channel Check Protocol-Error Detection/Correction Protocol[link]
Jul 1988Spurious Error Prevention Due to Power Interruptions[link]
Aug 1988Dynamic Arbitration Level Assignment for a Direct Memory Access Subsystem[link]
Sep 1988Command Dependent Column Address Select Switching[link]
Sep 1988Input/Output Exerciser Test Package for Personal Systems[link]
Oct 1988Sub-Addressing Extension to Programmable Option Select[link]


DateTitleIP.comSubject, Notes
Jan 1989Logging and Retrieving of Error Codes During Power-On Self Test Using BIOS Function Calls[link]
Feb 1989Microprocessor Bus State Monitor System[link]
Mar 1989Slot Windows for Circuit Edge Connectors[link]
Apr 1989Determination of Latest Read-Only Memory on Identical Adapters in IBM Ps/2 Computers[link]
Apr 1989Direct Memory Access for Multiple Requesting Computer Devices[link]
Apr 1989ROM Scan Extension for Video As a Special Case for Expanded ROM Scan [!][link]
May 1989Manufacturing Test Mode for a Personal Computer[link]
May 1989Adding and Deleting Loadable Power on Self Tests Configuration Files[link]AIX
May 1989Loadable Power on Self Test Adapter Setup Table[link]
May 1989Keyboard-Less Personal System[link]
May 1989Hardware Adapter Configuration[link]
May 1989Software Controlled Watchdog and Reboot Circuit Device for Personal Systems[link]
Jun 1989Non-Volatile Ram Protection Circuit[link]NVRAM
Jul 1989Integrated Input/Output Support Circuitry for Use With 80286/80386 Microprocessors [!][link]
Aug 1989Planar/Processor Interface for Personal Systems[link]
Sep 1989Automatic Configuration of a Personal Computer System[link]ADF
Sep 1989Preventing Unauthorized Access on a Personal Computer System[link]
Oct 1989Support Circuit for Intel 80386/82385 System With Optional Intel 80387[link]
Oct 1989Intel 82385 Snoop Diagnostic Circuit to Test Dma/Bus Master Snoop Cycles[link]
Oct 1989Expandability of Tcw/Tag Memory[link]
Oct 1989Multiple Digital Signal Processor Circuit Cards for Tool Control Applications[link]7552
Oct 1989"Next Byte Zero" Method for Data Steering[link]
Nov 1989CHANNEL Check Implementation for the MICRO CHANNEL[link]
Nov 1989Bus-Locking Mechanism in an Intel 82385 Cache Controller Subsystem[link]
Nov 1989Adapter Description Program Interface to Configure Adapters on Personal Computer Systems That Store Their Configuration Information in Non-Volatile RAM [!][link]ADP
Nov 1989High-Speed Memory Test for Personal System/2 Power on Self Test [!][link]POST
Nov 1989Method of Executing Manufacturing ROM Code Without Removing System Roms[link]
Dec 1989Decrease the Time to Test RAM Array Logic by Using the ECC Design Logic to Find Errors[link]ECC, POST
Dec 1989Special Planar Manufacturing Tests in Ros [!][link]POST
Dec 1989Dual Function ROM that Controls the Initial Program Load (IPL)[link]


DateTitleIP.comSubject, Notes
Jan 1990Multiple Processor Across the MICRO CHANNEL[link]
Jan 1990Method of Expanding the Hardware of a Personal Computer With Minimal Impact to Software Drivers[link]
Jan 1990Data Transfer for PIO To/From System Non-Preemptable[link]
Jan 1990Bus Timeout Implementation Using Counters[link]
Jan 1990Programmable Arbitration Time[link]
Jan 1990Mechanism to Capture Read Data[link]
Jan 1990Data Transfer for PIO To/From System Using Streaming Data[link]
Jan 1990Frame Grabber Card[link]
Jan 1990Dynamic Bus Transfer Algorithm[link]
Jan 1990Single Module Personal Computer[link]
Jan 1990System Bus Tag Ram[link]
Feb 1990Pre-Flll/Pre-Empty Thresholds Improve Bus Efficiency[link]
Feb 1990Bus Prototype Circuit Card for Personal Computers[link]
Feb 1990First Party Streaming Data Slaves Excluding 1, 2 Byte Masters[link]
Feb 1990Streaming Data Slave Control Directly From the Micro Channel Bus[link]
Feb 1990Dynamic Clock Frequency Changing for a Memory Controller[link]
Feb 1990Diagnostic Register-read in LSSD[link]
Feb 1990Initialization Code Executed After Post And Before the Operating System Gets Control[link]
Feb 1990Micro Channel File Multiplexer[link]DBA
Feb 1990Foolproof Parallel Port Strobe[link]
Mar 1990POS Register Definition Architected for Up to 8 Simms[link]POS
Mar 1990Bus Efficiency Improvement Via Timed PREEMPT[link]
Mar 1990System Control Block Get Configuration Command[link]SCB
Mar 1990Hardware Verification Scheme Detects All Types of Diskette Data Recovery Errors[link]
Mar 1990Power-On Self-Test Extension Providing Remote Program Load Capability For Communication Cards[link]RPL, POST
Mar 1990Functional Testing Option Cards Without Powering-Off Host[link]
Mar 1990Electrically Erasable Programmable Read-Only Memory Update Condition Avoidance[link]flash update
Apr 1990Display Subsystem[link]
Apr 1990Interfacing Processor-based Devices to Personal Computing Systems[link]
Apr 1990POS Register Extension With Multiple Chips, Each With Single Set of POS Registers[link]POS
Apr 1990NVRAM Dynamic Data Area[link]NVRAM
May 1990Method of Implementing "Fairness" Arbitration in Accessing a Computer System Bus[link]
May 1990Simple Compatible System ROM Area Expansion[link]
Jun 1990PS/2 Card Extender Rigid Support Mechanism[link]
Jun 1990Diagnostic Address Compare for Unauthorized Access to Shared Memory[link]
Jun 1990Interrupt Service Allocation Technique for the Micro Channel Bus[link]
Jun 1990Dual-Function Memory Control Signal[link]
Jun 1990In-Line High Density Connectors[link]
Jun 1990Method of Providing Metastable-Free Interrupt Asynchronous Computer Interface Operation[link]
Jun 1990Micro Channel Slave Interface Chip Burst Termination Method[link]
Jul 1990Early Decoding Method for Intel 82385 Cache Controller-Based Systems[link]
Jul 1990Method for Using a Thirty-Two Bit Slave in a Sixteen-Bit Micro Channel Architecture System[link]
Jul 1990Active Restore Circuit for Open Collector Signals[link]
Jul 1990Generation of Bus Signals -Preempt And Arb(0-3) for Micro Channel Architecture[link]
Aug 1990External Burst-Mode FIFO for Non-Burst Diskette Controller[link]
Aug 1990Information Panel [!][link]Op Panel
Aug 1990Modified Cache Update Cycle for Intel 82385 Based Systems[link]
Aug 1990Extending Available System Memory by User-Selectable Rom-to-Ram Configuration Remap[link]
Sep 1990Looping Scatter/Gather Bus Master to Coprocessor Data Transfer Mechanism[link]
Oct 1990Diagnostic Interrupt Logic Testing[link]
Oct 1990Intelligent Bus Controller - DMA Slave Communication[link]
Oct 1990System/9370 I/O Bus to Micro Channel Attachment[link]
Dec 1990Fast Algorithm for Most Efficient Bit-Steering[link]ECC
Dec 1990System Debug Facility - A System Testing Computer Architecture for High-Speed Processing Systems[link]
Dec 1990Servicing of Incorrect Load Source Disk Data Level[link]
Dec 1990Method for Downloading Firmware to Ram[link]
Dec 1990Program Controlled Micro Channel Bus Cycle Extension[link]


DateTitleIP.comSubject, Notes
Jan 1991Terminal Control Unit Adapter for Migration to Co-operative Processing[link]S/370
Jan 1991Sixty-Four-Byte Latency Dynamic Dma Transfers[link]
Feb 1991Programmable Cache Decoder[link]
Feb 1991Transient Program Code[link]
Mar 1991Memory Chip Failure-Detection Mechanism[link]ECC
Mar 1991Improved Connector for Ps/2 Micro Channel Adapter Cards[link]
Mar 1991Method of Using Scatter/Gather Indirect List in Micro Channel Computer Systems[link]
Mar 1991Method for Providing Status Information in Micro Channel Computer Systems[link]
Apr 1991Programmable Burst Control for Load/Store Operations[link]
Apr 1991Micro Channel Streaming Data Burst Protocol for DMA Slaves[link]
Apr 1991Dynamic Remapping of Bad Memory Segments During Power-On Self-Test in a PS/2 System[link]
Apr 1991Bypass Bus Mechanism for Direct Memory Access Controllers[link]
Apr 1991High-Speed Micro Channel Arbitration Via Selection of Arbitration Levels[link]
Apr 1991Use of Standard ACMOS L1/L2 Latches to Provide Testable Asynchronous, Edge-Triggered And Set/Reset Latches[link]
May 1991Field Replaceable Unit Isolation in a Dual-Bus System[link]
May 1991Sub 100H Bus Architecture [!][link]
May 1991Algorithm for Data Alignment On the Micro Channel[link]
May 1991Master Streaming Data Register File Access[link]
May 1991Providing Memory Refresh During a COP Halt Command[link]
May 1991Master Streaming Data Boundary Optimizations On the Micro Channel[link]
May 1991Fast Addressing Logic to Improve Read Access Time From a Register File[link]
May 1991iAPX 80386 Erratum Workaround[link]
May 1991Architected Pseudo Slots for Additional Planar Functions On Micro Channel Systems[link]
May 1991Micro Channel Slave Providing Central Translate And Steering Logic[link]
May 1991Programmable Single Bit Error Counter for Computer Error Checking And Correction Facilities[link]ECC
May 1991Chained Subsystem Control Block Architecture for Personal Systems[link]SCB
May 1991Disk Cache Read Prefetch Command Function for Personal Systems[link]
Jun 1991Circuit for Ensuring a Valid Programmable Option Select Identification For Personal Systems Adapters[link]POS
Jun 1991Programmable Memory Address Decoder for Personal Computer Systems[link]
Jun 1991DMA Command Chaining to Support Bus Master Interleaved Memory And I/O Transfers On a Micro Channel[link]
Jun 1991Diagnostics Which Check Hardware ECC Correction/Detection[link]EOS
Jul 1991MICRO Channel I/O Adapter Bus Signal Switching[link]
Jul 1991Control of Initial Program Load From Diskette[link]
Aug 1991Autoreference Function [!][link]
Aug 1991Microcode POS Register Implementation[link]POS
Aug 1991Micro Channel Stress Card[link]
Aug 1991Termination Status Blocks as Defined in the Subsystem Control Block for Micro Channel[link]SCB
Aug 1991Test Case Portability Method for Micro Channel Personal Computers[link]
Aug 1991Test Case Compatibility Method for Micro Channel Personal Computers[link]
Aug 1991Micro Channel Planar to Adapter Card Interrupt Redirection[link]
Aug 1991Extendable Alert Register[link]
Sep 1991Personal Computer System Adapter Post Error Reporting by Inaccessible Rom[link]
Sep 1991Address Error Detection for MICRO Channel Bus Extensions Far From the Host (> 2 Meters)[link]
Sep 1991Programmable Bus Interface Unit for Personal Computers [!][link]
Sep 1991Subsystem Control Block Immediate Commands for the Micro Channel[link]SCB
Sep 1991Multiple Bus Masters with Arbitration and Preempt Capability For Personal Computers[link]
Sep 1991IBM PC Interface Integrated Circuit[link]
Sep 1991CPU Bus Bandwidth Pacing in a Dual Bus System[link]
Oct 1991Data Exchange Adapter for Micro Channel/370[link]
Oct 1991Adaptive Mailbox Timer[link]
Nov 1991MICRO Channel Common Communications Adapter[link]
Nov 1991Micro Channel I/O Buffer Card[link]
Nov 1991Micro Channel Emulation Tester for Busmaster Adapter Cards[link]
Dec 1991Printer Port Check Point Card[link]
Dec 1991High-Speed Serial Interface Micro Channel Adapter[link]
Dec 1991Hardware Implemented Control Store Bug Injector[link]


DateTitleIP.comSubject, Notes
Jan 1992Ten Bit Refresh Address Generation in Personal Computer Systems[link]
Jan 1992Daughter Card Shipping Restraint[link]
Jan 1992Personal Computer Systems Information Code Extension[link]POST
Jan 1992Subsystem Control Block Immediate Commands for the Micro Channel[link]SCB
Jan 1992Bus Architecture with Each Slot Capable of Multi-function IDs[link]
Jan 1992Subsystem Control Block Managed Streaming Mode Buffer[link]
Feb 1992Programmable Micro Channel I/O Slave Address Assignment Using Programmable Option Select[link]POS
Mar 1992MICRO CHANNEL Preempt Signal Transceiver Control[link]
Mar 1992Programmable Support for Controlling Memory Subsystem Configurations in Personal Computers[link]
Mar 1992Mounting PC Style Cards in Mid-Range Computer Packaging[link]
Mar 1992Method of Sharing Address Space in Testing Personal Computer Systems' Memory[link]
Mar 1992Dynamic Extended BIOS Data Area Allocation and Expansion for Personal Computer Systems[link]
Mar 1992Update Mechanism for Personal Computer System Resident Firmware [!][link]flash
Mar 1992Multifunction I/O Cards[link]
Mar 1992Selectable Bus Parity for Microcomputer Channel Bus[link]
Mar 1992Multiconnector PS/2 MICRO Channel Adapter Bracket[link]
Mar 1992Support of Memory above the 16-Megabyte Address Limit in OS/2[link]
Mar 1992Software Recovery of Page Faults on Microprocessors with Integrated Memory Management Units[link]
Apr 1992Method of Increasing Personal System Performance by Reducing Bus Cache Overhead[link]
May 1992High Density Feature and Memory Card Packaging[link]
May 1992Alternate Method to Burning EPROMs[link]
May 1992DMA Slave Data Security[link]
May 1992LSSD Asynchronous, Edge Sensitive Design Use in a Micro Channel Streaming Slave[link]
Jun 1992Method of Improving Parallel Port Interrupts in Personal Computers[link]
Jun 1992Fast Micro Channel Cache Control Lookup[link]
Jun 1992Algorithm to Provide Imaginary Linear Addressing to Standard Buffers[link]
Jun 1992Micro Channel Streaming Data Acknowledgment Terms for Slaves[link]
Jun 1992Use of Dirty, Buffered, and Invalidate Bits for Cache Operations[link]
Jun 1992High-Speed Intel 80486 External Cache Bus Structure[link]
Jun 1992Dual-Bus Arbitration for Personal Computer Systems[link]
Jun 1992Cache Coherency Cache Directory Table[link]
Jun 1992Interrupt Status Port Extension to the Subsystem Control Block Architecture[link]SCB
Jun 1992Timing Verification Model for Personal Computer Systems[link]
Jun 1992Micro Channel Streaming Data Request Control[link]
Jun 1992Internal Arbiter Enables/Disables[link]
Jun 1992Byte Count Algorithm for Bus-to-Bus DMA Slave Transfers[link]
Jun 1992Vibration Attenuator for MICRO Channel Cards[link]
Jun 1992MICRO Channel Slave Ready Generation During Bus Master DMA Transfers[link]
Jun 1992MICRO Channel Slave Streaming Data Request Generation[link]
Jul 1992Data Parity Platform[link]
Jul 1992I/O Address Protection Implementation[link]
Aug 1992Dual Processor Boot Procedure for LAN Services[link]MicroMASTER
Aug 1992Ensuring a Proper and Complete Processor Reset[link]
Aug 1992128-Bit Streaming Data Procedure for the Micro Channel[link]MCA 128-bit streaming
Aug 1992Write Lockout Mechanism to Provide Testability in a Free Running Counter Application[link]
Sep 1992Auxiliary Processor for Personal Computer Systems[link]
Sep 1992Realtime Field Replaceable Unit Isolation for Parity Errors[link]
Sep 1992Read Data Sensor for Micro Channel Personal Computers[link]
Sep 1992User Data Area Protection[link]sys. partition
Oct 1992Extended Micro Channel for Realtime Multimedia Applications[link]
Oct 1992High Performance Error Correction Code Implementation for Microprocessors[link]ECC
Oct 199232-Bit (ECC) Partial Write Data Conversion with a Cache Memory System[link]ECC
Oct 1992Method for Extending Advanced BIOS Feature ROM Services from the System Planar Advanced BIOS Modules[link]
Oct 1992Programmable Arbitration Level for Floppy Disk Controllers[link]
Oct 1992Setup Method for a Second Serial Port[link]POS
Nov 1992Computer State Machine Implementation of Subsystem Control Block Move Mode Logic Pseudo Code[link]SCB
Nov 1992Processor Option Cooling Kit for Personal Computers[link]T3, Model 90
Nov 1992Software Interface for Non-aligned Transfers[link]
Nov 1992Parallel Port Addressing for Personal Computers[link]
Nov 1992Mechanism for Reducing Component Module Pin Count in Personal Computers[link]
Nov 1992Burst Enable Bit for Floppy Disk Controllers [!][link]
Nov 1992Programmable Fairness Level for Floppy Disk Controllers[link]
Nov 1992Asynchronous Generation of DRAM Controls from Micro Channel Signals[link]
Nov 1992Fixed Disk Sharing via Small Computer System Interface Device Emulation through Compatibility BIOS[link]
Dec 1992Multiple Micro Channels[link]
Dec 1992Remote Program Load of a Diskless Initial Microcode Load Computer System[link]RPL
Dec 1992Processor Detection Circuit[link]
Dec 1992Modular System Partition[link]IML
Dec 1992Task Switching between Processes using the Sequencer[link]
Dec 1992Enhanced Memory FIFO Buffer[link]
Dec 1992Programmable Identification Scheme [!][link]POS


DateTitleIP.comSubject, Notes
Jan 1993Automated Microcode Sequence Checks[link]
Jan 1993Programmable Arbitration Interface Permits to Configure Pins Two Ways[link]
Jan 1993Diskette Operational Selection Methods for Personal Computers[link]
Jan 1993Enhanced Arbitration Method for Personal Computers[link]
Jan 1993Self Prioritizing Multi-dropped Interrupt Acknowledge Mechanism[link]
Feb 1993Method for Setting C2 Security Bit[link]C2
Mar 1993Memory Expansion Card Parity with an Error Correction Code Switch [!][link]ECC
Apr 1993Flexible Multiple Touch Screen Interface[link]
Apr 1993Supervisor Password Access to System Partition on Initial Microprogram Load Machines[link]IML
Apr 1993Non-Processor Based Zero Waitstate MICRO CHANNEL Bus Master State Machine[link]
May 1993Arbitration Level Program for Personal Computers[link]
May 1993Expansion Unit Setup for MICRO CHANNEL/EISA System[link]
May 1993Readable Address Location in Real Time Clock to Lock Security System Flags for Personal Computers [!][link]C2
May 1993Diagnostic Capability for Tag RAMS[link]
May 1993Digitally Controlled Signal Loading[link]
Jun 1993Interrupt Mechanism for Optimizing Data and Control Data Transfers[link]
Jun 1993Micro-Channel Shorts Detector[link]
Jun 1993Across-the-Bus Testing of Adapter Functions during Intitial Program Load[link]
Jun 1993Smart Burst - Dual Bus Control for Improved Personal Computer Performance[link]
Jun 1993Micro Channel Buffer Card Tester[link]
Jun 1993Auto-Bios Image Configurator [!][link]
Jun 1993Micro Channel Adapter Daughter Card Location Detection[link]
Jun 1993Micro Channel Buffer Card[link]
Jul 1993Power on Self Test Display Card[link]
Aug 1993Provision for an Abortee Micro Channel Cycle[link]
Aug 1993Parity Error Address Display Card[link]
Aug 1993Dynamic Reconfiguring of Personal Computer Systems After Accidental Exchange of Adapter Position in the Micro Channel[link]POS
Aug 1993Enhanced Reference Diskette for Personal Computers [!][link]
Aug 1993Processor Synchronization Circuitry for Computer Systems[link]
Aug 1993Interleaved Memory Dual Bus Data Selector [!][link]
Aug 1993Error Correction Circuitry for Dynamic Random Access Memories[link]ECC
Sep 1993Overwrite Protection Method for FLASH Memory[link]flash
Sep 1993Concurrent Operation of Local and Micro Channel Busses[link]
Sep 1993Controlling Computer Processor Initialization[link]
Sep 1993Generation of Extended Processor Identification Bits [!][link]
Sep 1993Dual-Speed Memory Controller[link]
Sep 1993Memory Configuration Table [!][link]
Sep 1993Overlapped Extended Graphic Adapter Block Transfer for Personal Computers[link]
Sep 1993Method for Storing and Updating Power on Self Test and Basic Input/Output Code[link]
Sep 1993Advanced Setup Procedure [!][link]
Sep 1993BIOS Function Call to Set Model Byte[link]
Sep 1993Cache Tag RAM Diagnostic Mode[link]
Sep 1993Adapter Card Operating Mode is Dependent on Bus Master Identification[link]
Sep 1993Initial Machine Load Process for Personal Computer Network Systems[link]IML
Sep 1993Enhancements for Adapter Description File Language[link]ADF
Sep 1993Model Byte Change by Means of the Setup Utility Program[link]
Sep 1993Integrated Controller with Fine-Tuned Memory Timings[link]
Oct 1993Programmable Driver Current Interface for Personal Computer Systems [!][link]
Oct 1993Support of Multiple initial Microcode Load Images on Personal Computer Reference Diskettes[link]IML
Oct 1993Reference Partition Location and Manipulation Utility[link]IML
Oct 1993MICRO CHANNEL Data Streaming and Input/Output Snooping Facility for Personal Computer Systems[link]
Oct 1993Staggered Refresh Memory for Personal Computer Systems[link]
Oct 1993Method of Providing a Memory-to-Memory Transfer Burst Control for Personal Computers[link]
Oct 1993Bus Allocation Algorithm for Personal Computers[link]
Oct 1993Error Reporting for Potentially Used Functions of a Multi-Function Chip[link]
Oct 1993Memory Presence Circuit for a Processor Complex[link]
Oct 1993Prefetching Cache in a Parallel Cache Architecture[link]
Oct 1993Method Of Providing A Programmable Arbitration Level Per Memory Channel For Personal Computers[link]
Oct 1993Method of Providing Soft Request Arbitration for Personal Computers[link]
Oct 1993Dynamic Clock Phase Shifter for Logic Delay Tracking[link]
Oct 1993Method of Providing Local Arbitration Control for Personal Computers[link]
Nov 1993Error Correction Circuit with Fast Pass through in Parity Mode[link]ECC
Nov 199332-Bit Free Running Diagnostic Timer[link]
Nov 1993Initial Program Load from a Generic Device for Personal Computer Systems[link]IPL, IML
Nov 1993Diagnostic Port for Computer Feature Cards [!][link]
Nov 1993Message Passing Protocol for Personal Computer Systems[link]
Dec 1993Enhanced Streaming Data Procedure for the MICRO CHANNEL[link]MCA 160 MB/s streaming
Dec 1993MICRO CHANNEL Verification Laboratory Tool[link]
Dec 1993Method of Accessing Uniquely Identically Addressed Input/Output Ports[link]POS
Dec 1993Low Cost Electro Magnetic Interference Interface Shield for Low Production Computers[link]


DateTitleIP.comSubject, Notes
Jan 1994High-Speed Data Streaming for Existing Personal Computers[link]
Jan 1994Switchable Mapping of I/O Card Registers into I/O or Memory Space[link]
Jan 1994Source Identification Register for Personal Computers[link]SCB
Jan 1994Micro Channel Programmable Option to Improve Channel Bandwidth[link]
Jan 1994Storage of Vital Product Data in Non-Volatile Random Access Memory[link]VPD
Jan 1994Two-Stage Microcode Support using Flash EEPROMS [!][link]flash
Feb 1994Parity Checking of Synchronous Bus Control Signals[link]
Feb 1994Read-Only Memory Recovery in a System with Initial Microcode Load [!][link]IML, flash?
Feb 1994Using Dual and Mappable Spare Bus[link]
Feb 1994Secondary Cache Daughterboard Assembly for 486/386-Based Personal Computers[link]
Feb 1994Power On Self Test Error Filter for High-Availability Servers[link]POST
Feb 1994SCSI Device Auto-Sensing for On-Board SCSI Interface Sub-System[link]
Feb 1994Cache Memory Data Bus to System Bus Interface [!][link]
Feb 1994PS/2 Option Card Testing[link]
Mar 1994Power-On Self-Test Memory Configuration Algorithm for Invalid CMOS/ NVRAM[link]POST
Mar 1994Fast, Expandable Multi-Word, Multi-Bit Magnitude Comparator[link]
Apr 1994Automatic Circular Remote Initial Program Load through Multiple Token Ring Adapter Cards[link]
Apr 1994Printed Circuit Board Bracket for PS/2 Adapter Cards[link]
Apr 1994Method for Accessing Non-Bursting Regions in Local Bus Address Space without Pre-Fetching[link]
Apr 1994Interleaved Dual-Port VRAM for High-Speed Communication[link]
Apr 1994Graphical Indicators of Power-on Self-Test Progression[link]POST
Apr 1994High Speed Arbitration for Multi-Drop, DOT-OR Networks[link]
Apr 1994Extended Stream Data Procedure for the MICRO CHANNEL[link]MCA 320 MB/s streaming
Apr 1994System Independent Method for Updating System Code[link]IML, flash upd., Int 15 D7h
Apr 1994Selectively Execute RAMPOST during Initial-Power-Load[link]
Apr 1994Resetting the Micro Channel Architecture Arbitration Time Dynamically using Lookahead[link]
Apr 1994128 Bit Streaming Data Procedure for the Micro Channel[link]
May 1994Connector with Alternate Staggered Contacts for Hot Pluggability[link]
May 1994Mechanism for Communication between an Exerciser and Adapter Microcode[link]MWAVE
May 1994Improvement of a Frame Ground Contact Between a System and Micro Channel Architecture Adapter[link]
May 1994Multi-Task Approach to Downloading Microcode Modules[link]
May 1994Comprehensive Data Parity Protection for Personal Computers[link]
May 1994Identification of Failing Bus Master[link]SCB
Jun 1994Method for Driving Excessively Loaded Master/Slave-Type Busses[link]
Jun 1994Method to Allow the Sharing of I/O Port Addresses between a Floppy Disk Controller and an IDE Hardfile Controller within an IBM PS/2 Micro Channel System[link]
Jun 1994Loosely Coupled Multi-Processing Method for Personal Computers[link]MicroMASTER
Jun 1994Enhanced Method for Determining Personal Computer System Configuration[link]BIOS, VPD
Jun 1994Microcode Image Name Specification [!][link]IML, flash
Jun 1994Dynamic Update Capability Determining Planar Board Features [!][link]POS
Jun 1994Error Detection and Correction on the Micro Channel Bus[link]
Jun 1994Micro Channel Signal Drivers Isolation in Personal Computers[link]
Jun 1994Device ID Extensions in Post Error Logging[link]
Jun 1994Controlling Jitter Of Multimedia Data through Hardware Threshholding[link]
Jun 1994Scheme to Interface Various Vendor External Microwire Compatible EEPROMs to a C2 Security Controller[link]C2
Jun 1994Information Display for Personal Computer System Messages[link]PC Server Op Panel
Jun 1994Micro Channel Enhancements for Personal Computers[link]
Jun 1994Basic Input/Output Services (BIOS) Generic Call for Personal Computers [!][link]BIOS Int 15 3Dh
Jun 1994Method for Interrupt Sharing with IDE Hard Files in IBM PS/2 Systems[link]
Jul 1994Personal Computer Processor Upgrading [!][link]
Jul 1994Automatic IPL Drive Switch [!][link]
Jul 1994Initialization Data Feedback Method for Personal Computers[link]initprogs
Jul 1994Partial Memory Bank Usage for Personal Computers[link]
Jul 1994Configuring Personal Computers for Medialess Operation[link]IML
Jul 1994Software Simulation of the Asynchronous Communications Port[link]
Jul 1994Clock Mode for Reading Memory[link]
Jul 1994Method of Testing Personal Computer Using a Static Random Access Memory[link]POST
Jul 1994Displaying Planar-Defined Messages on Personal Computers[link]ADP
Jul 1994Asynchronous Low-Level Management Functions[link]
Jul 1994RAM Filter to Avoid Interrupt Chaining through ROM[link]
Jul 1994Method for Adding an External Real Time Clock to a System Having an Internal Real Time Clock[link]
Jul 1994Common BIOS Services for Vital Product Data in Personal Systems[link]VPD, BIOS Int 15 D2h
Jul 1994Using Split Memory to Back-Up System Memory[link]
Jul 1994Multiple Memory Refresh Operation for Personal Computers[link]
Jul 1994Post Support for Manufacturing Medialess Machines[link]POST
Jul 1994Protecting CMOS Circuits in a 3- and 5-Volt Mixed Signal Environment[link]
Aug 1994Method of Sharing Interrupt Bus in Personal Computers[link]
Aug 1994Restoration of Micro Channel Control Signals during Arbitration[link]
Aug 1994Personal Computer Comprehensive Testing for FastInitial Program Load[link]
Aug 1994Cache Line Operations Overlapped with Micro Channel Arbitration[link]
Aug 1994Micro Channel Point of Sale Bit Capture with Programmable Array Logic and Latch[link]POS (not Point of Sale)
Aug 1994Functional Test Executing Actual Microprocessor Code [!][link]
Aug 1994Power-On Oscillator Control Circuit [!][link]
Aug 1994Method to Extend Personal Computer System Memory [!][link]Type 4 complex
Aug 1994Uninterrupted Multiple Bus Cycle Transfer Mechanism for Computer Systems[link]
Aug 1994Selectable Power-On Self-Test Modes[link]
Aug 1994Interface for Writing Subaddressing Data to Non-Volatile Random Access Memory through Setup[link]
Aug 1994Method to Improve Initial Microcode Loading for Personal Computers[link]IML
Aug 1994Circuit for Programmable Option Select Register that Configures Chip I/O Pins[link]POS
Aug 1994Direct Access Storage Device/Small Computer Systems Interface Device Support for OS/2[link]
Aug 1994Error Correction Code Detection with All Memory Outputs Stuck High or Low[link]ECC
Aug 1994Remote Operation of Power-On Self Test and the Reference Partition[link]POST
Sep 1994Enhanced Memory Error Handling Method for Personal Computers[link]POST
Sep 1994Locate Mode Device Driver Interface Structure for Micro Channel Based Personal Computers[link]SCB
Sep 1994Operational Surveillance Function[link]
Sep 1994Flexible Password Protection Scheme for a C2 Security/Electrically Erasable Programmable Read Only Memory Controller [!][link]C2
Sep 1994Determination of Excessive Single-Bit Errors[link]
Sep 1994Interconnect Verification Method for Boards [!][link]Processor Complex
Sep 1994Automatic Auto-Configuration Enable/Disable for Personal Computers[link]
Sep 1994Software for Exercising and Analyzing XGA Video Circuits[link]
Sep 1994Full Duplex Ethernet Adapter[link]
Sep 1994Swapping Failing Bits in 40-Pin Error Correcting SIMMS[link]ECC
Sep 1994Method for Increasing the Number of Micro Channel Arbitration Levels[link]
Sep 1994Method Allowing Small Computer System Interface Adapters to Coexist with Other Hardfile Adapters [!][link]
Oct 1994Initial Microcode Load Overlay Execution for Personal Computers[link]IML
Oct 1994Adapter Microcode Protection during Download[link]
Oct 1994Bypassing Acknowledgement of Post Error[link]
Oct 1994Diagnostic Cache Scratchpad Mode for Testing Personal Computers[link]
Oct 1994Search Initial Microcode Load Execution during PS/2 Post[link]IML
Oct 1994Method and Interface to Return from any Default Interrupt for Personal Systems[link]BIOS Int 15 FDh
Oct 1994Adapter Developer Diskette with Selective File Copying Feature[link]
Oct 1994Monitoring Method for Micro Channel Personal Computers[link]
Oct 1994Information Log Display Utility for Personal Computers[link]
Oct 1994Combined Status and Message-In Function for Small Computer System Interface[link]
Oct 1994Permanent Error Log in an Adapter Card[link]
Oct 1994Memory Remap Determination Method for Personal Computers[link]ADP
Nov 1994Serial Diagnostic Link for PS/2 Model 95 Processor Cards[link]
Nov 1994Improved Cache Performance for Personal Computers[link]
Nov 1994Card Feedback Select Mechanism for Personal Computers[link]
Nov 1994Micro Channel Master State Machine Employing an Unknown Clock[link]
Nov 1994Display Mode Detect and Setting for Flat Panel Controller[link]
Nov 1994Microprocessor Dual Usage Socket [!][link]
Nov 1994Address Space Visibility for a Multiple Bank Firmware Computer System[link]
Dec 1994Concurrent/Real Time Arbitration Utilization Circuit[link]
Dec 1994Detection Mechanism between 386 or 486 Upgrade Processor Unit[link]
Dec 1994Method to Achieve Software-Transparency of PC-Bus Expansion Link during the PC Power-on-Self-Test Sequence[link]
Dec 1994Performance Tuning for the Power-On Self Test[link]single-stage POST
Dec 1994Memory Adapter Improvements for Personal Computers[link]
Dec 1994486 L2 Write-through Cache Support in a Local Bus Multiprocessor System[link]


DateTitleIP.comSubject, Notes
Jan 1995Automatic Loading of User Selected Fonts During Power On Self Test [!][link]POST
Jan 1995Power-On Self-Test and Diagnostics Functions for Sixteen Bit Wide Small Computer System Interface Personal Computers[link]
Jan 1995Support in POST and SETUP for Automatically Setting Extra Video Memory[link]POST ?
Feb 1995Support Assembly for Riser Card and Adapter Cards[link]
Feb 1995Data Structures for Storing Subaddress Information[link]POS
Feb 1995Power Management Solution[link]
Mar 1995Liquid Crystal Display Support Bus for XGA Adapters[link]
Mar 1995Storing and Displaying Text Messages during Power-on Self Test [!][link]POST
Mar 1995Diagnostic Method for a Buffered Remote Interface[link]
Mar 1995Bus Arbitration on the Integrated Command Data Bus for an Asynchronous Transfer Mode Adapter Adapter[link]
Apr 1995Dual Bidirectional Interposer[link]
Apr 1995Micro Channel Architecture for Real-Time Multimedia[link]
Apr 1995Card Edge Connector Card Retainer[link]
May 1995Method for Determining Available Free Memory[link]BIOS Int 15 C7h
Jun 1995Optimization of Logical Drive Parameters based on Drive Size[link]
Jul 1995Recovery Method for Damaged Firmware[link]flash
Aug 1995Input/Output Test Circuit[link]
Aug 1995Method for Switching between Power-On and Standby Modes[link]
Aug 1995Method for Enabling Video Monitor Operation at International Standards Organization-Compliant Refresh Rates[link]
Sep 1995Selectable Processor Voltage Feature[link]
Sep 1995Method for Providing Digital to Analog Converter Shadowing on Micro Channel Systems[link]
Sep 1995Packetized Peer-to-Peer Bus Transfer[link]
Oct 1995Programmable Memory Fault Injection [!][link]
Oct 1995Resource Management for Non-Micro Channel DMA Masters[link]
Oct 1995Custom Device Installation[link]AIX
Nov 1995Auto Media Sense [?][link]

Content created and/or collected by:
Louis Ohland, Peter Wendt, William Walsh, Kevin Bowling, Jim Shorney, Tim Clarke, David Beem, Tatsuo Sunagawa, Tomáš Slavotínek, and many others.

Ardent Tool of Capitalism - MAD Edition! is maintained by Tomáš Slavotínek.
Last update: 17 Apr 2021 - Changes & Credits | Legal Info & Contact