GB1264096A - - Google Patents

Info

Publication number
GB1264096A
GB1264096A GB1264096DA GB1264096A GB 1264096 A GB1264096 A GB 1264096A GB 1264096D A GB1264096D A GB 1264096DA GB 1264096 A GB1264096 A GB 1264096A
Authority
GB
United Kingdom
Prior art keywords
store
data
interface unit
buffer
byte
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to GB3127870 priority Critical
Publication of GB1264096A publication Critical patent/GB1264096A/en
Application status is Expired legal-status Critical

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11CSTATIC STORES
    • G11C15/00Digital stores in which information comprising one or more characteristic parts is written into the store and in which information is read-out by searching for one or more of these characteristic parts, i.e. associative or content-addressed stores
    • G11C15/04Digital stores in which information comprising one or more characteristic parts is written into the store and in which information is read-out by searching for one or more of these characteristic parts, i.e. associative or content-addressed stores using semiconductor elements
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/10Program control for peripheral devices
    • G06F13/12Program control for peripheral devices using hardware independent of the central processor, e.g. channel or peripheral processor
    • G06F13/122Program control for peripheral devices using hardware independent of the central processor, e.g. channel or peripheral processor where hardware performs an I/O function other than control of data transfer

Abstract

1,264,096. Computer input/output. INTERNATIONAL BUSINESS MACHINES CORP. 27 June, 1970, No. 31278/70. Heading G4A. An I/O channel comprises a CPU interface unit and an I/O interface unit which operate concurrently and independently, the CPU interface unit to receive control data from the CPU, and the I/O interface unit to transfer data between I/O units and a main store in accordance with control data supplied by the CPU interface unit, whereby control data for a future data transfer is assembled in the CPU interface unit while a data transfer is taking place under the control of the I/O interface unit. The control data goes from CPU to CPU interface unit via a storage data register of the main store, there being one such register for each I/O channel (if more than one), but the storage address register of the main store is common to all I/O channels. The CPU interface unit has a data store and a data control store, and the I/O interface unit has an interface store, an address store, a count store and a buffer store, all these stores being associative stores with 3-state cells (though 2- state cells could be used), a primary and a secondary selector trigger per word location, the primaries and secondaries of a given store being connected as respective shift registers and with two input/output registers per store, Specifications 1,186,703 and 1,231,908 being referred to for details. Various fields of the input/output registers of the same and different stores are interconnected so that stores control themselves and each other, the I/O units and the main store address and data registers, using table-look-up operations. The data control store controls the data store. The data store receives from a channel control word the (main store) data address, data count, flags and command code, and also holds unit control words, and is connected to the I/O interface unit, including the address, buffer and count stores. The interface store controls itself, the other stores of the I/O interface unit and the main store, exchanges signals with I/O units as in Specification 1,264,095 (referred to), and maintains a count of the number of bytes in the buffer store. The count store holds a count of the number of bytes to be transferred between I/O unit and main store, and decrements it as transfer proceeds. The address store holds the main store address and increments it or decrements it as transfer proceeds. The buffer store acts as a buffer between I/O unit and main store, the primary and secondary selector triggers being connected as respective cyclic shift registers and indicating the next position available for storing a byte and the next position to be read out respectively. On input, each byte is stored twice in a respective word location of the buffer store, read-out to the main store being from either of the copies, avoiding the need for a crossover path (since the byte could be either byte of a main store half-word). On output, one byte is stored in each word of the buffer store, using the two possible positions alternately in successive word locations, or a stored bit in each byte may indicate which position is used. Fields of the two input/output registers of the address store are interconnected, as are fields of those of the count store. The address store includes a shift table. On input, the signals sent between the interface store and I/O-unit include "service in " and "service out" but time can be saved, in a modification, by using " service in " to set a service latch thus producing " service out " directly and setting an interlock latch which signals the appearance of " service in " to the interface store. The service latch is reset when " service in " drops but cannot be set again until the interlock latch has been reset by a signal from the interlock store provided for gating the byte from the I/O unit into the buffer store. The buffer store can be replaced by two stores which, on input, store input bytes alternately, each byte being duplicated in its respective word location in its respective buffer store, read-out to the main store being of one byte copy from each store simultaneously (or of a single byte from one store). The data control store in the CPU interface unit could alternatively be an associative read-only store. The buffer store could be a conventionally addressed store, the interface store holding and updating the addresses of the first and last bytes in the buffer store.
GB1264096D 1970-06-27 1970-06-27 Expired GB1264096A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3127870 1970-06-27

Publications (1)

Publication Number Publication Date
GB1264096A true GB1264096A (en) 1972-02-16

Family

ID=10320731

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1264096D Expired GB1264096A (en) 1970-06-27 1970-06-27

Country Status (10)

Country Link
JP (1) JPS5118296B1 (en)
BE (1) BE766468A (en)
CA (1) CA935935A (en)
CH (1) CH526166A (en)
DE (1) DE2130299C3 (en)
ES (1) ES392443A1 (en)
FR (1) FR2095551A5 (en)
GB (1) GB1264096A (en)
NL (1) NL7108868A (en)
SE (1) SE360759B (en)

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2341898A1 (en) * 1976-02-17 1977-09-16 Siemens Ag A method for performing data transmission between the peripheral units and a working memory, through a multiplexing channel
FR2406251A1 (en) * 1977-08-04 1979-05-11 Honeywell Inf Systems Enhancements has a data transfer control system
EP0010135A1 (en) * 1978-10-17 1980-04-30 Siemens Aktiengesellschaft Microprogrammed input/output controller and method for input/output operations
EP0021489A1 (en) * 1979-06-08 1981-01-07 Philips Electronics N.V. Input/output channel for a high-speed computing system
FR2471652A1 (en) * 1979-12-07 1981-06-19 Hitachi Ltd Method and system of data input / output
EP0088838A1 (en) * 1982-03-12 1983-09-21 Honeywell Bull Inc. Input/output multiplexer
EP0138840A1 (en) * 1983-01-28 1985-05-02 Gould Computer Systems, Inc. Synchronous communications multiplexer
WO2009101058A1 (en) * 2008-02-14 2009-08-20 International Business Machines Corporation Processing a variable length device command word at a control unit in an i/o processing system
US7840719B2 (en) 2006-10-10 2010-11-23 International Business Machines Corporation System and program products for facilitating input/output processing by using transport control words to reduce input/output communications
US7840718B2 (en) 2008-02-14 2010-11-23 International Business Machines Corporation Processing of data to suspend operations in an input/output processing log-out system
US7890668B2 (en) 2008-02-14 2011-02-15 International Business Machines Corporation Providing indirect data addressing in an input/output processing system where the indirect data address list is non-contiguous
US7899944B2 (en) 2008-02-14 2011-03-01 International Business Machines Corporation Open exchange limiting in an I/O processing system
US7904606B2 (en) 2008-07-31 2011-03-08 International Business Machines Corporation Transport control channel program chain linked branching
US7904605B2 (en) 2008-02-14 2011-03-08 International Business Machines Corporation Computer command and response for determining the state of an I/O operation
US7908403B2 (en) 2008-02-14 2011-03-15 International Business Machines Corporation Reserved device access contention reduction
US7917813B2 (en) 2008-02-14 2011-03-29 International Business Machines Corporation Exception condition determination at a control unit in an I/O processing system
US7937504B2 (en) 2008-07-31 2011-05-03 International Business Machines Corporation Transport control channel program message pairing
US7937507B2 (en) 2008-02-14 2011-05-03 International Business Machines Corporation Extended measurement word determination at a channel subsystem of an I/O processing system
US7941570B2 (en) 2008-02-14 2011-05-10 International Business Machines Corporation Bi-directional data transfer within a single I/O operation
US7984198B2 (en) 2006-10-10 2011-07-19 International Business Machines Corporation System and program products for facilitating access to status and measurement data associated with input/output processing
US8001298B2 (en) 2008-02-14 2011-08-16 International Business Machines Corporation Providing extended measurement data in an I/O processing system
US8055807B2 (en) 2008-07-31 2011-11-08 International Business Machines Corporation Transport control channel program chain linking including determining sequence order
US8082481B2 (en) 2008-02-14 2011-12-20 International Business Machines Corporation Multiple CRC insertion in an output data stream
US8095847B2 (en) 2008-02-14 2012-01-10 International Business Machines Corporation Exception condition handling at a channel subsystem in an I/O processing system
US8108570B2 (en) 2008-02-14 2012-01-31 International Business Machines Corporation Determining the state of an I/O operation
US8117347B2 (en) 2008-02-14 2012-02-14 International Business Machines Corporation Providing indirect data addressing for a control block at a channel subsystem of an I/O processing system
RU2445673C1 (en) * 2010-11-17 2012-03-20 Леонид Павлович Коршунов Device to control data output
RU2445675C1 (en) * 2010-11-17 2012-03-20 Леонид Павлович Коршунов System to control data output
US8166206B2 (en) 2008-02-14 2012-04-24 International Business Machines Corporation Cancel instruction and command for determining the state of an I/O operation
US8176222B2 (en) 2008-02-14 2012-05-08 International Business Machines Corporation Early termination of an I/O operation in an I/O processing system
US8196149B2 (en) 2008-02-14 2012-06-05 International Business Machines Corporation Processing of data to determine compatability in an input/output processing system
US8214562B2 (en) 2008-02-14 2012-07-03 International Business Machines Corporation Processing of data to perform system changes in an input/output processing system
US8312176B1 (en) 2011-06-30 2012-11-13 International Business Machines Corporation Facilitating transport mode input/output operations between a channel subsystem and input/output devices
US8312189B2 (en) 2008-02-14 2012-11-13 International Business Machines Corporation Processing of data to monitor input/output operations
US8332542B2 (en) 2009-11-12 2012-12-11 International Business Machines Corporation Communication with input/output system devices
US8346978B1 (en) 2011-06-30 2013-01-01 International Business Machines Corporation Facilitating transport mode input/output operations between a channel subsystem and input/output devices
US8364854B2 (en) 2011-06-01 2013-01-29 International Business Machines Corporation Fibre channel input/output data routing system and method
US8364853B2 (en) 2011-06-01 2013-01-29 International Business Machines Corporation Fibre channel input/output data routing system and method
US8473641B2 (en) 2011-06-30 2013-06-25 International Business Machines Corporation Facilitating transport mode input/output operations between a channel subsystem and input/output devices
US8478915B2 (en) 2008-02-14 2013-07-02 International Business Machines Corporation Determining extended capability of a channel path
US8549185B2 (en) 2011-06-30 2013-10-01 International Business Machines Corporation Facilitating transport mode input/output operations between a channel subsystem and input/output devices
US8583989B2 (en) 2011-06-01 2013-11-12 International Business Machines Corporation Fibre channel input/output data routing system and method
US8677027B2 (en) 2011-06-01 2014-03-18 International Business Machines Corporation Fibre channel input/output data routing system and method
US8683083B2 (en) 2011-06-01 2014-03-25 International Business Machines Corporation Fibre channel input/output data routing system and method
RU2522025C1 (en) * 2012-12-06 2014-07-10 Тимофей Леонидович Коршунов Data output control system
US8918542B2 (en) 2013-03-15 2014-12-23 International Business Machines Corporation Facilitating transport mode data transfer between a channel subsystem and input/output devices
US8990439B2 (en) 2013-05-29 2015-03-24 International Business Machines Corporation Transport mode data transfer between a channel subsystem and input/output devices
US9021155B2 (en) 2011-06-01 2015-04-28 International Business Machines Corporation Fibre channel input/output data routing including discarding of data transfer requests in response to error detection
RU2551807C2 (en) * 2012-12-18 2015-05-27 Леонид Павлович Коршунов Data output control device
US9052837B2 (en) 2008-02-14 2015-06-09 International Business Machines Corporation Processing communication data in a ships passing condition

Cited By (75)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2341898A1 (en) * 1976-02-17 1977-09-16 Siemens Ag A method for performing data transmission between the peripheral units and a working memory, through a multiplexing channel
FR2406251A1 (en) * 1977-08-04 1979-05-11 Honeywell Inf Systems Enhancements has a data transfer control system
EP0010135A1 (en) * 1978-10-17 1980-04-30 Siemens Aktiengesellschaft Microprogrammed input/output controller and method for input/output operations
DE2845218C2 (en) * 1978-10-17 1986-03-27 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
EP0021489A1 (en) * 1979-06-08 1981-01-07 Philips Electronics N.V. Input/output channel for a high-speed computing system
FR2471652A1 (en) * 1979-12-07 1981-06-19 Hitachi Ltd Method and system of data input / output
EP0088838A1 (en) * 1982-03-12 1983-09-21 Honeywell Bull Inc. Input/output multiplexer
EP0138840A1 (en) * 1983-01-28 1985-05-02 Gould Computer Systems, Inc. Synchronous communications multiplexer
EP0138840A4 (en) * 1983-01-28 1987-03-16 Gould Comp Systems Inc Synchronous communications multiplexer.
US7984198B2 (en) 2006-10-10 2011-07-19 International Business Machines Corporation System and program products for facilitating access to status and measurement data associated with input/output processing
US8140713B2 (en) 2006-10-10 2012-03-20 International Business Machines Corporation System and program products for facilitating input/output processing by using transport control words to reduce input/output communications
US7840719B2 (en) 2006-10-10 2010-11-23 International Business Machines Corporation System and program products for facilitating input/output processing by using transport control words to reduce input/output communications
US7908403B2 (en) 2008-02-14 2011-03-15 International Business Machines Corporation Reserved device access contention reduction
US7856511B2 (en) 2008-02-14 2010-12-21 International Business Machines Corporation Processing of data to suspend operations in an input/output processing system
US7890668B2 (en) 2008-02-14 2011-02-15 International Business Machines Corporation Providing indirect data addressing in an input/output processing system where the indirect data address list is non-contiguous
US7899944B2 (en) 2008-02-14 2011-03-01 International Business Machines Corporation Open exchange limiting in an I/O processing system
US9436272B2 (en) 2008-02-14 2016-09-06 International Business Machines Corporation Providing indirect data addressing in an input/output processing system where the indirect data address list is non-contiguous
US7904605B2 (en) 2008-02-14 2011-03-08 International Business Machines Corporation Computer command and response for determining the state of an I/O operation
US7840717B2 (en) 2008-02-14 2010-11-23 International Business Machines Corporation Processing a variable length device command word at a control unit in an I/O processing system
US7917813B2 (en) 2008-02-14 2011-03-29 International Business Machines Corporation Exception condition determination at a control unit in an I/O processing system
US9330042B2 (en) 2008-02-14 2016-05-03 International Business Machines Corporation Determining extended capability of a channel path
US7937507B2 (en) 2008-02-14 2011-05-03 International Business Machines Corporation Extended measurement word determination at a channel subsystem of an I/O processing system
US7941570B2 (en) 2008-02-14 2011-05-10 International Business Machines Corporation Bi-directional data transfer within a single I/O operation
US7840718B2 (en) 2008-02-14 2010-11-23 International Business Machines Corporation Processing of data to suspend operations in an input/output processing log-out system
US8001298B2 (en) 2008-02-14 2011-08-16 International Business Machines Corporation Providing extended measurement data in an I/O processing system
US9298379B2 (en) 2008-02-14 2016-03-29 International Business Machines Corporation Bi-directional data transfer within a single I/O operation
US8082481B2 (en) 2008-02-14 2011-12-20 International Business Machines Corporation Multiple CRC insertion in an output data stream
US8095847B2 (en) 2008-02-14 2012-01-10 International Business Machines Corporation Exception condition handling at a channel subsystem in an I/O processing system
US8108570B2 (en) 2008-02-14 2012-01-31 International Business Machines Corporation Determining the state of an I/O operation
US8117347B2 (en) 2008-02-14 2012-02-14 International Business Machines Corporation Providing indirect data addressing for a control block at a channel subsystem of an I/O processing system
US9052837B2 (en) 2008-02-14 2015-06-09 International Business Machines Corporation Processing communication data in a ships passing condition
US8495253B2 (en) 2008-02-14 2013-07-23 International Business Machines Corporation Bi-directional data transfer within a single I/O operation
US9043494B2 (en) 2008-02-14 2015-05-26 International Business Machines Corporation Providing indirect data addressing in an input/output processing system where the indirect data address list is non-contiguous
US8166206B2 (en) 2008-02-14 2012-04-24 International Business Machines Corporation Cancel instruction and command for determining the state of an I/O operation
US8176222B2 (en) 2008-02-14 2012-05-08 International Business Machines Corporation Early termination of an I/O operation in an I/O processing system
US8196149B2 (en) 2008-02-14 2012-06-05 International Business Machines Corporation Processing of data to determine compatability in an input/output processing system
US8214562B2 (en) 2008-02-14 2012-07-03 International Business Machines Corporation Processing of data to perform system changes in an input/output processing system
CN101939731B (en) 2008-02-14 2012-10-03 国际商业机器公司 Processing a variable length device command word at a control unit in an I/O processing system
US9483433B2 (en) 2008-02-14 2016-11-01 International Business Machines Corporation Processing communication data in a ships passing condition
US8312189B2 (en) 2008-02-14 2012-11-13 International Business Machines Corporation Processing of data to monitor input/output operations
US8977793B2 (en) 2008-02-14 2015-03-10 International Business Machines Corporation Determining extended capability of a channel path
US8892781B2 (en) 2008-02-14 2014-11-18 International Business Machines Corporation Bi-directional data transfer within a single I/O operation
US8838860B2 (en) 2008-02-14 2014-09-16 International Business Machines Corporation Determining extended capability of a channel path
US8806069B2 (en) 2008-02-14 2014-08-12 International Business Machines Corporation Providing indirect data addressing for a control block at a channel subsystem of an I/O processing system
US8392619B2 (en) 2008-02-14 2013-03-05 International Business Machines Corporation Providing indirect data addressing in an input/output processing system where the indirect data address list is non-contiguous
US8516161B2 (en) 2008-02-14 2013-08-20 International Business Machines Corporation Providing indirect data addressing for a control block at a channel subsystem of an I/O processing system
US8478915B2 (en) 2008-02-14 2013-07-02 International Business Machines Corporation Determining extended capability of a channel path
WO2009101058A1 (en) * 2008-02-14 2009-08-20 International Business Machines Corporation Processing a variable length device command word at a control unit in an i/o processing system
US7904606B2 (en) 2008-07-31 2011-03-08 International Business Machines Corporation Transport control channel program chain linked branching
US8055807B2 (en) 2008-07-31 2011-11-08 International Business Machines Corporation Transport control channel program chain linking including determining sequence order
US7937504B2 (en) 2008-07-31 2011-05-03 International Business Machines Corporation Transport control channel program message pairing
US8332542B2 (en) 2009-11-12 2012-12-11 International Business Machines Corporation Communication with input/output system devices
US8972615B2 (en) 2009-11-12 2015-03-03 International Business Machines Corporation Communication with input/output system devices
RU2445673C1 (en) * 2010-11-17 2012-03-20 Леонид Павлович Коршунов Device to control data output
RU2445675C1 (en) * 2010-11-17 2012-03-20 Леонид Павлович Коршунов System to control data output
US8738811B2 (en) 2011-06-01 2014-05-27 International Business Machines Corporation Fibre channel input/output data routing system and method
US8677027B2 (en) 2011-06-01 2014-03-18 International Business Machines Corporation Fibre channel input/output data routing system and method
US8769253B2 (en) 2011-06-01 2014-07-01 International Business Machines Corporation Fibre channel input/output data routing system and method
US9021155B2 (en) 2011-06-01 2015-04-28 International Business Machines Corporation Fibre channel input/output data routing including discarding of data transfer requests in response to error detection
US8364853B2 (en) 2011-06-01 2013-01-29 International Business Machines Corporation Fibre channel input/output data routing system and method
US8364854B2 (en) 2011-06-01 2013-01-29 International Business Machines Corporation Fibre channel input/output data routing system and method
US8683083B2 (en) 2011-06-01 2014-03-25 International Business Machines Corporation Fibre channel input/output data routing system and method
US8583988B2 (en) 2011-06-01 2013-11-12 International Business Machines Corporation Fibre channel input/output data routing system and method
US8583989B2 (en) 2011-06-01 2013-11-12 International Business Machines Corporation Fibre channel input/output data routing system and method
US8683084B2 (en) 2011-06-01 2014-03-25 International Business Machines Corporation Fibre channel input/output data routing system and method
US8549185B2 (en) 2011-06-30 2013-10-01 International Business Machines Corporation Facilitating transport mode input/output operations between a channel subsystem and input/output devices
US8312176B1 (en) 2011-06-30 2012-11-13 International Business Machines Corporation Facilitating transport mode input/output operations between a channel subsystem and input/output devices
US8631175B2 (en) 2011-06-30 2014-01-14 International Business Machines Corporation Facilitating transport mode input/output operations between a channel subsystem and input/output devices
US8346978B1 (en) 2011-06-30 2013-01-01 International Business Machines Corporation Facilitating transport mode input/output operations between a channel subsystem and input/output devices
US8473641B2 (en) 2011-06-30 2013-06-25 International Business Machines Corporation Facilitating transport mode input/output operations between a channel subsystem and input/output devices
RU2522025C1 (en) * 2012-12-06 2014-07-10 Тимофей Леонидович Коршунов Data output control system
RU2551807C2 (en) * 2012-12-18 2015-05-27 Леонид Павлович Коршунов Data output control device
US8918542B2 (en) 2013-03-15 2014-12-23 International Business Machines Corporation Facilitating transport mode data transfer between a channel subsystem and input/output devices
US9195394B2 (en) 2013-05-29 2015-11-24 International Business Machines Corporation Transport mode data transfer between a channel subsystem and input/output devices
US8990439B2 (en) 2013-05-29 2015-03-24 International Business Machines Corporation Transport mode data transfer between a channel subsystem and input/output devices

Also Published As

Publication number Publication date
CH526166A (en) 1972-07-31
CA935935A1 (en)
DE2130299C3 (en) 1978-09-21
DE2130299A1 (en) 1972-01-05
BE766468A1 (en)
CA935935A (en) 1973-10-23
ES392443A1 (en) 1973-10-01
NL7108868A (en) 1971-12-29
JPS5118296B1 (en) 1976-06-09
FR2095551A5 (en) 1972-02-11
DE2130299B2 (en) 1975-10-23
BE766468A (en) 1971-09-16
SE360759B (en) 1973-10-01

Similar Documents

Publication Publication Date Title
US4153932A (en) Data processing apparatus for highly parallel execution of stored programs
EP0118446B1 (en) First-in, first-out (fifo) memory configuration for queue storage
US2968027A (en) Data processing system memory controls
US5521876A (en) FIFO memory device capable of writing contiguous data into rows
GB1233117A (en)
DE1246289B (en) Condition register for a program-controlled data processing system
US4181936A (en) Data exchange processor for distributed computing system
GB1120428A (en) Improvements in data processing systems
GB1108805A (en) Improvements in or relating to electronic data processing systems
US3500466A (en) Communication multiplexing apparatus
GB1101295A (en) Improvements in or relating to apparatus for relaying information
US5093780A (en) Inter-processor transmission system having data link which automatically and periodically reads and writes the transfer data
NL6806737A (en)
GB1258972A (en)
US3840862A (en) Status indicator apparatus for tag directory in associative stores
SU1561834A3 (en) Memory addressing device
US5530829A (en) Track and record mode caching scheme for a storage system employing a scatter index table with pointer and a track directory
EP0130018A2 (en) Electronic conference system
US4145745A (en) Address conversion device for secondary memories
EP0113612A2 (en) Address conversion unit for multiprocessor system
GB1108804A (en) Improvements relating to electronic data processing systems
US4954988A (en) Memory device wherein a shadow register corresponds to each memory cell
GB1142622A (en) Monitoring systems and apparatus
KR910002325B1 (en) Data transferring buffer circuits for data exchange
GB1209999A (en) Data processing apparatus

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee