CA2090709A1 - System to service processor interface for a tablet computer - Google Patents

System to service processor interface for a tablet computer

Info

Publication number
CA2090709A1
CA2090709A1 CA2090709A CA2090709A CA2090709A1 CA 2090709 A1 CA2090709 A1 CA 2090709A1 CA 2090709 A CA2090709 A CA 2090709A CA 2090709 A CA2090709 A CA 2090709A CA 2090709 A1 CA2090709 A1 CA 2090709A1
Authority
CA
Canada
Prior art keywords
service processor
processor
digitizer
host processor
host
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.)
Granted
Application number
CA2090709A
Other languages
French (fr)
Other versions
CA2090709C (en
Inventor
Krishnamurthi Kannan
Kyriakos Leontiades
Frank Peter Novak
Vikram Sharma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 by International Business Machines Corp filed Critical International Business Machines Corp
Publication of CA2090709A1 publication Critical patent/CA2090709A1/en
Application granted granted Critical
Publication of CA2090709C publication Critical patent/CA2090709C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03547—Touch pads, in which fingers can move on a surface

Abstract

A digitizer tablet computer has a host processor connected to a service processor which, in turn, is connected to a digitizer controller and to a power subsystem microcontroller whereby primary control of a keyboard, a digitizer, and a power subsystem is off loaded from the host processor to the service processor. The host processor communicates with the service processor through an interface comprising a status register, an input buffer and an output buffer through which host commands and data are transferred.
The digitizer produces coordinate data that is initially processed in the service processor before being passed on to the host processor. The host processor is interrupted to receive the processed data and executes in a tight loop until a predetermined amount of processed data is received.
CA002090709A 1992-04-15 1993-02-23 System to service processor interface for a tablet computer Expired - Fee Related CA2090709C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/869,278 US5329625A (en) 1992-04-15 1992-04-15 System to service processor interface for a tablet computer
US869,278 1992-04-15

Publications (2)

Publication Number Publication Date
CA2090709A1 true CA2090709A1 (en) 1993-10-16
CA2090709C CA2090709C (en) 1998-09-29

Family

ID=25353242

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002090709A Expired - Fee Related CA2090709C (en) 1992-04-15 1993-02-23 System to service processor interface for a tablet computer

Country Status (8)

Country Link
US (1) US5329625A (en)
EP (1) EP0566263B1 (en)
JP (1) JPH0644000A (en)
KR (1) KR960003067B1 (en)
CN (1) CN1028922C (en)
BR (1) BR9301338A (en)
CA (1) CA2090709C (en)
DE (1) DE69332940T2 (en)

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Also Published As

Publication number Publication date
CN1077805A (en) 1993-10-27
EP0566263A2 (en) 1993-10-20
JPH0644000A (en) 1994-02-18
KR960003067B1 (en) 1996-03-04
DE69332940T2 (en) 2004-03-11
US5329625A (en) 1994-07-12
CN1028922C (en) 1995-06-14
BR9301338A (en) 1993-10-19
KR930022179A (en) 1993-11-23
CA2090709C (en) 1998-09-29
EP0566263B1 (en) 2003-05-07
EP0566263A3 (en) 1997-06-04
DE69332940D1 (en) 2003-06-12

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