EP0191382A2 - Anzeigesteuergerät - Google Patents

Anzeigesteuergerät Download PDF

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Publication number
EP0191382A2
EP0191382A2 EP86101276A EP86101276A EP0191382A2 EP 0191382 A2 EP0191382 A2 EP 0191382A2 EP 86101276 A EP86101276 A EP 86101276A EP 86101276 A EP86101276 A EP 86101276A EP 0191382 A2 EP0191382 A2 EP 0191382A2
Authority
EP
European Patent Office
Prior art keywords
cursor
selectable field
key
display
refresh buffer
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.)
Withdrawn
Application number
EP86101276A
Other languages
English (en)
French (fr)
Other versions
EP0191382A3 (de
Inventor
Mutsumi Aramaki
Shigeru Matsubara
Toshio Shimizu
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 EP0191382A2 publication Critical patent/EP0191382A2/de
Publication of EP0191382A3 publication Critical patent/EP0191382A3/de
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/08—Cursor circuits

Definitions

  • This invention relates to a display controller in accordance with the preamble of claim 1.
  • a field containing information selectable by an operator is called a selectable field.
  • a selectable field In a display having a light pen, it is arranged to be possible to select information by positioning the light pen to the selectable field.
  • a display without the light pen it is necessary to first move the cursor to a desired selectable field by operating a cursor control key, and to select information by pressing a cursor select key.
  • This operation to move the cursor to the selectable field by the cursor control key in the display without the light pen (selector pen) is slow and cumbersome because the movement speed is restricted by the speed of machine or retry is required if it fails to move the cursor to a correct position.
  • a control key called a selectable field tab key is provided for the keyboard so as to allow rapid movement of the cursor to the selectable field.
  • the selectable field identification code in a code store is searched starting from the current cursor position and the cursor address modified according to the storage location of the detected code.
  • the invention allows to move the cursor to a selectable field more rapidly and accurately than in the prior art using the cursor control keys.
  • a video control means 2 has a function to display the cursor on the screen of a CRT display 1 corresponding to a cursor address stored in a cursor address storage means 3. That is, the cursor is displayed at a display position indicated by the cursor address.
  • the video control means 2 has a function to display characters indicated by character codes stored in the code storage means 4 on the screen.
  • the code storage means 4 has a plurality of storage locations corresponding to a plurality of display positions on the screen and stores not only the character codes but also various control codes such as attributes. Stored in the top storage location of the selectable field is a selectable field identification code (SF identification code).
  • SF identification code selectable field identification code
  • the key input means 9 is provided with a special control key 10 for immediately moving the cursor to the top of selectable field being displayed on the screen.
  • the key-operation detector means 8 connected to the key input means 9 detects pressing of the control key, it supplies an output signal indicating it to the access means 5.
  • the access means 5 reads out the codes from locations in the code storage means 4 that succeed one another in a predetermined direction from a location corresponding to a current cursor display location, and supplies them to the the identification code detector means 6.
  • the identification code detector means 6 When the identification code detector means 6 detects an SF identification code, it supplies an output signal indicating it to the access means 5 and the cursor address modification means 7. Responsive to it, the access means 5 stops reading of codes. On the other hand, the cursor address modification means 7 modifies the cursor address in the cursor address storage means 3 so as to display the cursor on the screen of CRT 1 at a display position corresponding to a location in the code storage means 4 where the detected SF identification code is stored.
  • FIG 2 it shows a more detailed embodiment of the invention, wherein the functions of the access means 5, the identification code detector means 6, the cursor address modification means 7 and the key--operation detector means 8 in the basic configuration of Figure 1 are materialized by a microprocessor (MPU) 20 and microprograms.
  • MPU microprocessor
  • the MPU 20 has an arrangement that contains various circuits including an address register (AR) 21 and a register group 22. Since such an arrangement is well known in the art, its detailed description is omitted herein.
  • a bus 34 extending from the MPU 20 are a control storage 23, a refresh buffer 24, a video control circuit 25 and a keyboard interface circuit 29.
  • the bus 34 includes a data bus, an address bus and a control line.
  • the control storage 23 stores microprograms for controlling various operations of the MPU 20.
  • the refresh buffer 24 corresponds to the code storage means 4 in Figure 1, and stores not only said SF identification code but also various codes for display.
  • the video control circuit 25 has functions to take out character dot pattern data from a character generator 27 in response to character codes taken out from the refresh buffer 24, and to display them on a CRT screen 28.
  • the video control circuit 25 has also a cursor address register (CAR) 26 and functions to display a cursor C at a display position corresponding to its content.
  • CAR cursor address register
  • the keyboard interface circuit 29 is connected with a keyboard 31 that has various keys. When any key is operated, the keyboard interface circuit 29 sets a scan code indicating that key in a scan code register 30, and supplies an interrupt request signal requesting reading of the scan code to the MPU through a line 35.
  • the MPU 20 can perform read or write operation by setting a suitable address in the AR 21 for selectively specifying not only the control storage 23 and the refresh buffer 2 4 but also the CAR 26 and the scan code register 30.
  • a cursor select key 32 and a selectable field tab (SFT) key 33 that is provided according to the invention. That is, the SFT key corresponds to the control key 10 of Figure 1, and is for moving the cursor to the selectable field.
  • SFT key corresponds to the control key 10 of Figure 1, and is for moving the cursor to the selectable field.
  • cursor movement control operation is described in more detail by referring to Figures 2 and 3, the latter of which shows sequence of operation d the MPU 20 when an operator presses the SFT key 33.
  • the keyboard interface circuit 29 When detecting the operation of the SFT key 33, the keyboard interface circuit 29 sets a scan code corresponding to the SFT key in the scan code register 30 and generates an interrupt request signal on the line 35. Responsive to the interrupt request signal, the MPU 20 takes out successive instructions of microprogram for keyboard interruption from the control storage 23, and reads the scan code in the scan code register 30 according to these instructions (Step 4 0 in Figure 3) to determine whether or not it is a scan code for the SFT key 33 (Step 41). If it is not the scan code of the SFT key 33, the MPU 20 performs suitable operation by taking out a microprogram corresponding to the code. However, if it detects the scan code of the SFT key 33, it performs the following operation by taking out a microprogram relating to the SFT key 33.
  • Step 42 it reads a cursor address in the CAR 26 of the video control circuit 25 into a register 22a of the register group 22 in the MPU 20 (Step 42).
  • a cursor address in the CAR 26 of the video control circuit 25 into a register 22a of the register group 22 in the MPU 20 (Step 42).
  • an address itself indicating a storage location in the refresh buffer 24 is used as a cursor address indicating a display position on the CRT screen 28. Therefore, the cursor address read into the register 22a also indicates a storage location corresponding to a current cursor display position.
  • the SFT key 33 is established to instruct cursor movement to a selectable field after the current cursor position, or in a direction where the address increases gradually, in searching the SF identification code
  • the cursor address in the register 22a is added with 1 and set in the AR 21 (Step 43), which is used for reading a code in the refresh buffer 24 to be stored in a register 22b of the register group 22 - (Step 44).
  • Step 45 it is examined whether or not the code in the register 22b is an SF identification code(Step 45). This examination is performed in such a manner that an SF identification code is previously stored in another register 22c, which is compared with the code in the register 22b. If an SF identification code is not detected, the address in the AR 21 is incremented to repeat reading codes from the refresh buffer 24 until it is detected (Step 46).
  • the address in the AR 21 is written in the CAR 26 as a new address - (Step 4 7).
  • the video control circuit 25 displays the cursor C at a display position specified by the content of CAR 26, or at the top of selectable field.
  • Figure 2 shows a simple example where three selectable fields 36, 37 and 38 are displayed on the CRT screen.
  • the SFT key 33 is pressed in a status where the cursor C is at the indicated position, it moves immediately to the display position P at the top of selectable field 36. Pressing the SFT key 33 again causes the cursor C to moves to the display position Q at the top of selectable field 37. Pressing the SFT key once again causes it to move to the display position R at the top of uppermost field 38.
  • the address is circulated to specify a storage location corresponding to a display position at the upper left comer of the CRT screen 28 following a storage location corresponding to a display position at the lower right comer in reading code from the refresh buffer 2 4 for searching an SF identification code.
  • the operator can select information in the selectable field by pressing the cursor select key 32.
  • the above-described embodiment has one SFT key 33 for moving the cursor C only in one direction, it is possible to provide two SFT keys, one of which is for the forward movement as above, the other for the backward movement. In such case, it becomes required to modify Steps 4 1 , 42 and 43 in Figure 3 so as to determine which of the forward SFT or the backward SFT is pressed, the address to be set in the AR 21 according to the result of control, and whether the address is updated incrementally or decrementally.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Digital Computer Display Output (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Controls And Circuits For Display Device (AREA)
EP86101276A 1985-02-15 1986-01-31 Anzeigesteuergerät Withdrawn EP0191382A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP26664/85 1985-02-15
JP60026664A JPS61188586A (ja) 1985-02-15 1985-02-15 表示制御装置

Publications (2)

Publication Number Publication Date
EP0191382A2 true EP0191382A2 (de) 1986-08-20
EP0191382A3 EP0191382A3 (de) 1989-11-29

Family

ID=12199672

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101276A Withdrawn EP0191382A3 (de) 1985-02-15 1986-01-31 Anzeigesteuergerät

Country Status (2)

Country Link
EP (1) EP0191382A3 (de)
JP (1) JPS61188586A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0406430A4 (en) * 1988-10-27 1991-08-21 Fanuc Ltd Search system of shape constituent elements
EP0383938A4 (en) * 1988-08-26 1991-09-11 Fanuc Ltd Shape input system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3524182A (en) * 1966-06-13 1970-08-11 Ibm Display system
JPS5128444B2 (de) * 1971-09-27 1976-08-19
JPS5145466B2 (de) * 1972-05-09 1976-12-03
JPS5827509B2 (ja) * 1975-12-26 1983-06-09 株式会社日立製作所 画面分割制御装置におけるカ−ソル移動制御装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0383938A4 (en) * 1988-08-26 1991-09-11 Fanuc Ltd Shape input system
EP0406430A4 (en) * 1988-10-27 1991-08-21 Fanuc Ltd Search system of shape constituent elements

Also Published As

Publication number Publication date
EP0191382A3 (de) 1989-11-29
JPS61188586A (ja) 1986-08-22
JPH0327916B2 (de) 1991-04-17

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Inventor name: ARAMAKI, MUTSUMI