Collection of PS/2 and Micro Channel related patents held by IBM and other companies.

Gathered by Tomás Slavotínek and Louis Ohland. Last update: 8 Oct 2020.

IBM

Patent No., Local PDF	Patent Title	Google Patents	Subject, Notes
EP0281999B1	Data processing system with pluggable option card	[link]	MCA/POS
EP0282637B1	Computer system accepting feature cards	[link]	MCA adapters
EP0283580B1	Computer system with direct memory access channel arbitration	[link]
EP0288607B1	Computer system having a multi-channel direct memory access arbitration	[link]
EP0343768B1	Microcomputer system incorporating a cache subsystem using posted writes	[link]
EP0343770B1	Multi-bus microcomputer system with bus arbitration.	[link]
EP0402054B1	Command delivery for a computing system	[link]	SCB
EP0419004B1	Computer system with program loading apparatus and loading method	[link]	IBL/IML
EP0426330B1	Enclosure for a computer	[link]	Model 85/95
EP0434267A2	Shared hardware interrupt circuit for personal computers.	[link]	MCA
EP0468625B1	Personal computer system with protected storage for interface and system utility programs	[link]
EP0472274A1	Data processing apparatus having connectors to receive system components	[link]	386SX/DX socket
EP0478119B1	Personal computer system with interrupt controller	[link]
EP0479428A1	Data processing apparatus for dynamically setting timings in a dynamic memory system	[link]
EP0508685A2	Power-on control system for a computer.	[link]
EP0511769A1	Method and apparatus for processing interrupts in a computer system	[link]
EP0517406A2	Computer system for enabling a choice of error detection technologies	[link]
EP0518504B1	Personal computer with local bus arbitration	[link]
EP0567237A1	Method and apparatus for increasing usable memory space	[link]
EP0576241A1	Computer system and system expansion unit	[link]
EP0654742A2	Multiple bus interface	[link]	ISA/MCA/PCMCIA
EP0656586A1	Method and system for switching between a processor upgrade card and a planar processor	[link]
EP0661632A1	Booting of operating systems in computers	[link]
EP0661638A1	Method and apparatus for transferring data in a computer	[link]
EP0661640A1	System and method for accessing data in a computer system including a cache controller and a memory controller connected in parallel	[link]
US4118611	Buckling spring torsional snap actuator	[link]	Model M K/B
US4692691	Test system for keyboard interface circuit	[link]
US4890219	Mode conversion of computer commands	[link]
US4901234A	Computer system having programmable DMA control	[link]
US5004866	Self-contained grounding strip	[link]	Model 85/95 chassis
US5008829	Personal computer power supply	[link]	Model 90/95 (and other)
US5021922	Portable personal computer	[link]	Model P70/P75
US5022077	Apparatus and method for preventing unauthorized access to BIOS in a personal computer system	[link]
US5032952	Pivoting power supply	[link]	Model 85/95 PSU
US5034917	Computer system including a page mode memory with decreased access time and method of operation thereof	[link]
US5038142	Touch sensing display screen apparatus	[link]	Touchselect
US5038239	Integrated electronic card-frame assembly for a rigid disk drive	[link]
US5038320	Computer system with automatic initialization of pluggable option cards	[link]	POS
US5043877	Architecture converter for slave elements	[link]	MCA to EISA adapter bridge
US5043931	Wrap test system and method	[link]	ACPA?
US5045998	Method and apparatus for selectively posting write cycles using the 82385 cache controller	[link]	80386/82385
US5047898	Deflectable contact for providing positive surface contact for shielding electromagnetic interference	[link]
US5051096	Planar board support structure	[link]	Model 85/95 planar
US5054360	Method and apparatus for simultaneous output of digital audio and MIDI synthesized music	[link]	ACPA?
US5063496	Signaling attempted transfer to protected entry point BIOS routine	[link]
US5067041	Apparatus for reducing electromagnetic radiation from a computer device	[link]	Model 85/95 chassis
US5083931	Device grounding spring	[link]
US5098175	Removable guide apparatus for a rail-mounted device employed in a computer	[link]	Model 85/95 chassis/DASD
US5100215	Enclosure apparatus for retaining devices within a computer	[link]	Model 85/95 chassis/DASD
US5109490	Data transfer using bus address lines	[link]	MCA: 64-bit streaming
US5109506	Microcomputer system including a microprocessor reset circuit	[link]
US5112119	Support structure for devices in a computer apparatus	[link]	Model 85/95 chassis/DASD
US5119498	Feature board with automatic adjustment to one of two bus widths based on sensing power level at one connection contact	[link]	MCA adapters
US5125080	Logic support chip for at-type computer with improved bus architecture	[link]
US5125084	Control of pipelined operation in a microcomputer system employing dynamic bus sizing with 80386 processor and 82385 cache controller	[link]	80386/82385
US5128995	Apparatus and method for loading a system reference diskette image from a system partition in a personal computer system	[link]	conv. partition, IBL/IML
US5129090	System bus preempt for 80386 when running in an 80386/82385 microcomputer system with arbitration	[link]	80386/82385
US5131082	Command delivery for a computing system for transfers between a host and subsystem including providing direct commands or indirect commands indicating the address of the subsystem control block	[link]	SCB
US5136465	Personal computer with tandem air flow dual fans and baffle directed air cooling	[link]	Model 90
US5136713	Apparatus and method for decreasing the memory requirements for BIOS in a personal computer system	[link]	2-stage IBL/IML
US5138706	Password protected enhancement configuration register for addressing an increased number of adapter circuit boards with target machine emulation capabilities	[link]	POS extension
US5142447	Grounding apparatus for rail-mounted devices employed in a computer	[link]	Model 85/95 DASD cage
US5146582	Data processing system with means to convert burst operations into memory pipelined operations	[link]
US5162979	Personal computer processor card interconnect system	[link]	Processor Complex
US5170471	Command delivery for a computing system for transferring data between a host and subsystems with busy and reset indication	[link]	SCB
US5170481	Microprocessor hold and lock circuitry	[link]
US5175822	Apparatus and method for assigning addresses to SCSI supported peripheral devices	[link]	Spock card edge?
US5175826	Delayed cache write enable circuit for a dual bus microcomputer system with an 80386 and 82385	[link]	80386/82385
US5185864	Interrupt handling for a computing system with logical devices and interrupt reset	[link]	SCB
US5187781	Shared hardware interrupt circuit for personal computers	[link]
US5187792	Method and apparatus for selectively reclaiming a portion of RAM in a personal computer system	[link]
US5191544	Personal computer enclosure with shielding	[link]	Model 90
US5193161	Computer system having mode independent addressing	[link]
US5193170	Methods and apparatus for maintaining cache integrity whenever a CPU write to ROM operation is performed with ROM mapped to RAM	[link]
US5193174	System for automatically redirecting information to alternate system console in response to the comparison of present and default system configuration in personal computer system	[link]	Model 85/95 serial console
US5210875	Initial BIOS load for a personal computer system	[link]	IBL/IML
US5214695	Apparatus and method for loading a system reference diskette image from a system partition in a personal computer system	[link]	IBL/IML
US5226134	Data processing system including a memory controller for direct or interleave memory accessing	[link]	complex
US5230052	Apparatus and method for loading BIOS into a computer system from a remote storage location	[link]
US5237676	High speed data transfer system which adjusts data transfer speed in response to indicated transfer speed capability of connected device	[link]	MCA: Streaming
US5237690	System for testing adaptor card upon power up and having disablement, enablement, and reconfiguration options	[link]	MCA: SLOTFLAG
US5241661	DMA access arbitration device in which CPU can arbitrate on behalf of attachment having no arbiter	[link]
US5245615	Diagnostic system and interface for a personal computer	[link]
US5265255	Personal computer system with interrupt controller	[link]
US5276864	Personal computer with alternate system controller error detection	[link]
US5280588	Multiple input/output devices having shared address space	[link]
US5287460	Bus interface circuit for dual personal computer architecture peripheral adapter board	[link]
US5287519	LAN station personal computer system with controlled data access for normal and unauthorized users and method	[link]	C2 security
US5289477	Personal computer wherein ECC and parity error checking can be selectively chosen for memory elements installed in the system, memory elements enabling selective choice of error checking, and method	[link]
US5293493	Preemption control for central processor with cache	[link]
US5299315	Personal computer with programmable threshold FIFO registers for data transfer	[link]
US5307482	Computer, non-maskable interrupt trace routine override	[link]
US5313592	Method and system for supporting multiple adapters in a personal computer data processing system	[link]
US5313593	Personal computer system with bus noise rejection	[link]
US5325264	Device for removing a direct access storage device from a personal computer	[link]
US5325492	System for asynchronously delivering self-describing control elements with a pipe interface having distributed, shared memory	[link]
US5327531	Data processing system including corrupt flash ROM recovery	[link]
US5327545	Data processing apparatus for selectively posting write cycles using the 82385 cache controller	[link]	80386/82385
US5329634	Computer system with automatic adapter card setup	[link]	POS for ISA
US5341422	Trusted personal computer system with identification	[link]	C2 security
US5341487	Personal computer having memory system with write-through cache and pipelined snoop cycles	[link]
US5353202	Personal computer with shielding of input/output signals	[link]	Model 90 (and other)
US5353417	Personal computer with bus interface controller coupled directly with local processor and input/output data buses and for anticipating memory control changes on arbitration for bus access	[link]
US5355489	BIOS load for a personal computer system having a removable processor card	[link]	Model 90/95
US5375084	Selectable interface between memory controller and memory SIMMs	[link]
US5379342	Method and apparatus for providing enhanced data verification in a computer system	[link]
US5379386	Micro channel interface controller	[link]	MCA
US5379400	Method and system for determining memory refresh rate	[link]
US5381538	DMA controller including a FIFO register and a residual register for data buffering and having different operating modes	[link]	T3+ complex
US5381541	Computer system having planar board with single interrupt controller and processor card with plural processors and interrupt director	[link]	Processor Complex
US5388156	Personal computer system with security features and method	[link]	C2 security
US5388228 US5506972	Computer system having dynamically programmable linear/fairness priority arbitration scheme	[link]
US5396597	System for transferring data between processors via dual buffers within system memory with first and second processors accessing system memory directly and indirectly	[link]
US5404452	Personal computer bus and video adapter for high performance parallel interface	[link]
US5410699	Apparatus and method for loading BIOS from a diskette in a personal computer system	[link]	floppy IBL/IML
US5420760	Microcomputer enclosure with interrupted wedge locking arrangement and shielding liner	[link]	Model 90 (and other)
US5430847	Method and system for extending system buses to external devices	[link]
US5432939	Trusted personal computer system with management control over initial program loading	[link]	C2 security
US5432946	LAN server personal computer with unattended activation capability	[link]	remote pwr-on
US5446869	Configuration and RAM/ROM control of PCI extension card residing on MCA adapter card	[link]	MCA/PCI
US5446898	Method and apparatus for configuring and installing a loadable ABIOS device support layer in a computer system	[link]
US5450559	Microcomputer system employing address offset mechanism to increase the supported cache memory capacity	[link]	80386/82385
US5452429	Error correction code on add-on cards for writing portions of data words	[link]
US5459839	System and method for managing queue read and write pointers	[link]
US5459842	System for combining data from multiple CPU write requests via buffers and using read-modify-write operation to write the combined data to the memory	[link]
US5465357	Method and apparatus for an automated dynamic load of an ABIOS device support layer in a computer system	[link]
US5469577	Providing alternate bus master other publications with multiple cycles of bursting access to local bus in a dual bus system including a processor local bus and a device communications bus	[link]	Gearbox
US5471585	Personal computer system with input/output controller having serial/parallel ports and a feedback line indicating readiness of the ports	[link]	I/O controller
US5477242	Display adapter for virtual VGA support in XGA native mode	[link]	XGA
US5481709	Method and apparatus for providing a modular ABIOS device support layer in a computer system	[link]
US5481724	Peer to peer computer-interrupt handling	[link]
US5495611	Method and apparatus for dynamic load of an ABIOS device support layer in a computer system	[link]
US5499378	Small computer system emulator for non-local SCSI devices	[link]
US5504904	Personal computer having operating system definition file for configuring computer system	[link]
US5504905	Apparatus for communicating a change in system configuration in an information handling network	[link]
US5515474	Audio I/O instruction interpretation for audio card	[link]	ACPA?
US5522064	Data processing apparatus for dynamically setting timings in a dynamic memory system	[link]
US5524267	Digital I/O bus controller circuit with auto-incrementing, auto-decrementing and non-incrementing/decrementing access data ports	[link]
US5530887	Methods and apparatus for providing automatic hardware device identification in computer systems that include multi-card adapters and/or multi-card planar complexes	[link]	POS
US5537607	Field programmable general purpose interface adapter for connecting peripheral devices within a computer system	[link]
US5239631	CPU bus allocation control	[link]
US5539912	Computer system having a selectable memory module presence detect information option	[link]
US5544334	Micro channel bus computer system with IDE hard drive interface	[link]	Lacuna
US5548786	Dynamic bus sizing of DMA transfers	[link]
US5553306	Method and apparatus for controlling parallel port drivers in a data processing system	[link]
US5555373	Inactivity monitor for trusted personal computer system	[link]	C2 security
US5557784	Power on timer for a personal computer system	[link]
US5568611	Unauthorized access monitor	[link]	Server 95
US5574786	Securing trusted personal computer system against unauthorized movement	[link]	Model 56/57, Model 76/77
US5586327	Extended initialization for personal data processing systems	[link]	IPL
US5630078	Personal computer with processor reset control	[link]
US5634137	Method and apparatus for updating system configuration based on open/closed state of computer housing cover	[link]
US5644729	Bidirectional data buffer for a bus-to-bus interface unit in a computer system	[link]	T3+ complex
US5651139	Protected system partition read/write access on a SCSI controlled DASD	[link]	IBL/IML partition
US5655106	Personal computer with riser connector for expansion bus and alternate master	[link]
US5678019 US5829008	Real-time clock with extendable memory	[link]
US5680288	Hot plugging of an adapter card	[link]	MCA
US5726922	Assembly for removably connecting data storage devices	[link]	Model 95A RAID bay
US5732280	Method and apparatus for dynamically assigning programmable option select identifiers	[link]	POS
US5742758	Password protecting ROM based utilities in an adapter ROM	[link]
US5754821	Method and system for providing access to a protected partition of a memory device utilizing a passthru command	[link]	IBL/IML partition
US5761533	Computer system with varied data transfer speeds between system components and memory	[link]	T3+ complex
US5765008	Personal computer with riser card PCI and micro channel interface	[link]	PC 700 riser
US5826075	Automated programmable firmware store for a personal computer system	[link]	flash update
US5873129	Method and apparatus for extending physical system addressable memory	[link]
US5878256	Method and apparatus for providing updated firmware in a data processing system	[link]	flash update
US5898857	Method and system for interfacing an upgrade processor to a data processing system	[link]	CPU upgrade
US5918007	Trusted personal computer system with limited accessibility	[link]	C2 security
US5980275	Electronic circuit board interface mounting bracket	[link]	MCA bracket
USD314195	Front panel for a computer	[link]	Model 95
USD339111	Computer housing	[link]	Model 85/95
USD362238	Computer housing	[link]	PC Server 500

ALR

Patent No., Local PDF	Patent Title	Google Patents	Subject, Notes
US5321827	Computer system with modular upgrade capability	[link]

Altera

Patent No., Local PDF	Patent Title	Google Patents	Subject, Notes
US5111423	Programmable interface for computer system peripheral circuit card	[link]	MCA interface chip

Chips and Technologies

Patent No., Local PDF	Patent Title	Google Patents	Subject, Notes
US4991085	Personal computer bus interface chip with multi-function address relocation pins	[link]

Future Domain

Patent No., Local PDF	Patent Title	Google Patents	Subject, Notes
US5434516	Automatic SCSI termination circuit	[link]
US5544326	Interface and control circuit for regulating data flow in a SCSI initiator with multiple host bus interface selection	[link]	18C50 (FD MCS-700 / IBM Patriot)
US5732223A	SCSI host adapter with shared command and data buffer	[link]

NCR

Patent No., Local PDF	Patent Title	Google Patents	Subject, Notes
US5379403	Method and interface adapter for interfacing an ISA board to an MCA system by the issuance of an ILLINI-CDCHRDY signal from the interface adapter	[link]