CN85100974A - Displaying controller of chinese character - Google Patents
Displaying controller of chinese character Download PDFInfo
- Publication number
- CN85100974A CN85100974A CN 85100974 CN85100974A CN85100974A CN 85100974 A CN85100974 A CN 85100974A CN 85100974 CN85100974 CN 85100974 CN 85100974 A CN85100974 A CN 85100974A CN 85100974 A CN85100974 A CN 85100974A
- Authority
- CN
- China
- Prior art keywords
- character
- chinese character
- chinese
- show
- displaying controller
- 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- Withdrawn
Links
Images
Landscapes
- Controls And Circuits For Display Device (AREA)
Abstract
Chinese character type display controller can be used for computing machine, particularly in personal computer and the Chinese terminal, under software is supported, in order to show Chinese character and ascii character.
The present invention uses common monochrome display (resolution 720 * 350 points), can accomplish every screen 26 row under the staggered scanning system, 40 Chinese characters of every row, or 80 ascii characters, and full screen can show 1024 Chinese characters.Accomplished the complete compatibility on screen management with the western language system, the Chinese character speed that hardware produces was 25000 word/seconds, can show continuous uninterrupted form character on screen, and printer and displaying controller of Chinese character can be shared a matrix magazine.
Description
The present invention is a displaying controller of Chinese character, can be used in computing machine, particularly personal computer and the Chinese terminal, under certain software is supported, in order to show Chinese character and ascii character.
Chinese character displaying scheme (the Taiwan patent No. 16832) in the lucky Chinese Card in the storehouse in existing IBM-5550 personal computer and Taiwan is to adopt Bit MAP method, utilizes graphic terminal, shows Chinese character.Its principle as shown in Figure 1.CPU writes the pattern lattice information of Chinese character in the graphic presentation buffer zone (4).When CRTC(3) obtaining the address control, with the address signal refresh graphics display buffer in cycle.Graphic presentation buffer zone (4) takes out lattice information successively and sends in the latch (7), be put into then in the figure serial follower (9), figure serial follower (9) becomes serial data to parallel data-switching, delivers in the graphic alphanumeric display, forms Hanzi font.
Existing character formula display system as shown in Figure 2.Ascii character is put into the refresh memory (3) of 2K, and attribute codes is put in the other 2K refresh memory (4), CRTC(5) and CPU obtain control by the address Port Multiplier to refresh memory.According to character clock (6), latch (7) latchs the data of refresh memory output.Character generator (11) claims character library again, deposits the pattern lattice information of ascii character, and the white space between every capable ascii character is also calculated a part of doing character pattern.The output of latch is as the part of font address.Adding by CRTC(5) row of output selects signal (9) to constitute sweep signal to character library, under the control of sweep signal, the pattern lattice information of character library output ascii character is sent in the shift register (10), shift register (10) converts lattice information to serial data by walking abreast according to the dot matrix clock, be sent to Video processing logic (12) again, deliver on the display at last and show.Hence one can see that, and this character library (11) is to be visited by CPU.
The hanzi system made from graphical method and the compatibility of original system are not high, mainly are widely different with original system on the screen management, and the Chinese character display speed is slow.If screen display reaches 1000 word/screens, Chinese character shows the cost height.And existing character display system can not show Chinese character.Mainly be that its refresh memory of depositing ascii character (3) output has only 8, can only discern 256 kinds of situations, remove ascii character and can only show 64 different Chinese characters.
Purpose of the present invention is to improve the display speed and the capacity of display of Chinese character, reduces Chinese character and shows cost, makes displaying controller of Chinese character to carry out work under various CPU controls, and solves the demonstration problem of tabulationcharacter under the Chinese character mode simultaneously.
Feature of the present invention is that displaying controller of Chinese character is the character formula, and itself does not comprise CPU, but links to each other with CPU by bus, shows Chinese character and ascii character under the control of a CRTC.Wherein Chinese character occupies the position of two ascii characters.As shown in Figure 3, increased 4KRAM refresh memory (3), made the figure place of depositing reveal codes be increased to the 16-24 position, shown that the figure place of control reaches the 24-32 position.Increased one-level decoding scheme (5) and (6) simultaneously and made Chinese character show the Chinese character font address that sign indicating number provides, can be distributed on the different chips by decoding scheme.Make like this to show that number of words has surpassed 64, reach 8196-200000 different Chinese character.
When showing, one section blank must be arranged between every capable Chinese character, to distinguish the different Chinese character of two row, if this section blank also be can be regarded as the part of character pattern, the character library capacity needs the 512K byte at least so, if not can be regarded as the part of character pattern, just can not show continuous uninterrupted form character.The present invention is for addressing this problem, the character library that adopts has two kinds, a kind of is overall shape character library (8), a kind of is local shape character library (7), each scan line on the overall situation shape character library support screen, part scan line on the local shape character library support screen is mainly used to show ascii character and Chinese character.Two kinds of character libraries can adopt different capabilities according to different needs, and the selection of two kinds of character libraries is to realize by the control bit in the refresh memory (3).
Because the Chinese character font storage capacity is big, will increase cost for the printer setup matrix magazine separately, the present invention does not show the time interval by utilizing two row between the Chinese characters, give CPU control, Chinese font store not only can be in order to show Chinese character like this, also can be visited simultaneously, in order to support Chinese character printing and graphic presentation Chinese character by CPU.
Major advantage of the present invention is, uses common monochrome display (resolution is 720 * 350 points), under the staggered scanning system, can accomplish every screen 26 row, and 40 Chinese characters of every row or 80 ascii characters reach the level that full screen shows 1024 Chinese characters.Accomplished with the western language system compatible fully on screen management.The Chinese character speed that hardware produces was 25000 word/seconds, can show continuous uninterrupted form character on screen, and printer and displaying controller of Chinese character can be shared a matrix magazine.
Accompanying drawing of the present invention has three:
Fig. 1: graphic presentation synoptic diagram
Fig. 2: character shows synoptic diagram
Fig. 3: character-type Chinese-character shows synoptic diagram
Embodiments of the invention are:
One, the selection of components and parts and technical parameter are as follows:
CRTC selects MC6845 for use;
Refresh memory adopts 6116 2K static RAM (SRAM)s, store access cycle＜200nS;
Latch, decoding scheme, control circuit are selected the relevant integrated circuit of 74LS series for use;
Character library is selected 27128 or 27256 EPROM store access cycle＜200nS for use;
Scan clock is 16.27MHz, through the character clock behind the frequency division, produces to control 6845 cycle address signals;
Display adopts the medium afterglow monochrome display, and resolution is 720 * 350 points.
Two, the following (see figure 3) of implementation principle
CPU is by address Port Multiplier (1) gating reveal codes refresh memory (3), by data multiplex device (2) showing sign indicating number, attribute code and control information write in the reveal codes refresh memory (3), CRTC(9) the cycle address signal of Chan Shenging is by address Port Multiplier (1), scanning reveal codes refresh memory (3), showing sign indicating number, attribute code is put into latch, this shows that sign indicating number has 14 width, can be addressed to 16 * 1024 Chinese character positions, character library selects code translator (5) to determine that this demonstration sign indicating number uses overall shape character library (8) or local shape character library (7) then, determine this Chinese character place chip position simultaneously, select signal (12) to be in the same place with row then, pattern lattice information is taken out, be sent to shift register (10), under the effect of dot matrix clock (13), lattice information is become serial data, send into video logic treatment circuit (11), CRTC(9) the synchronizing signal control of video logic processing circuit (11) that sends, the output of video logic treatment circuit (11) divides two-way, one the road is used as the character clock signal presents CRTC, one the tunnel is defeated by monochrome display, shows Chinese character and ascii character.Give CPU in the control that does not show time interval character library, allow the CPU visit, so that the control printer.
Claims (5)
1, existing Chinese Character Display Technology mainly shows Chinese character with graphics mode, and character lattice information must all be put into and show in the refresh memory, feature of the present invention be a kind of and CPU independently, general character-type Chinese-character display controller.
2, the displaying controller of Chinese character according to claim 1 is characterized in that: the width of inner demonstration control bus is 16 to 32, in reveal codes refresh memory (3), deposit and show sign indicating number, and display control information, show that wherein sign indicating number takies 14 at least, finish Chinese character and ascii character demonstration work automatically by steering logic.
3, according to the displaying controller of Chinese character of claim 1 or 2, it is characterized in that displaying controller of Chinese character, with a CRTC(9) demonstration of control Chinese character and ascii character.
4, according to the displaying controller of Chinese character of claim 1 or 2, the matrix magazine that it is characterized in that displaying controller of Chinese character has two kinds, a kind of is local shape character library (7), the part scan line on its support screen, and a kind of is each scan line on its support screen of overall shape character library (8).
5, according to claim 1 or 2, local shape character library (7) and overall shape character library (8) are to be visited by CPU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100974A CN85100974B (en) | 1985-04-01 | 1985-04-01 | Chinese character display controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100974A CN85100974B (en) | 1985-04-01 | 1985-04-01 | Chinese character display controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85100974A true CN85100974A (en) | 1986-07-30 |
| CN85100974B CN85100974B (en) | 1987-04-22 |
Family
ID=4791551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85100974A Expired CN85100974B (en) | 1985-04-01 | 1985-04-01 | Chinese character display controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85100974B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499174B (en) * | 2009-01-16 | 2011-11-30 | 深圳市中青宝网网络科技股份有限公司 | Method for reducing texture memory required in dynamic Chinese character generation |
-
1985
- 1985-04-01 CN CN85100974A patent/CN85100974B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499174B (en) * | 2009-01-16 | 2011-11-30 | 深圳市中青宝网网络科技股份有限公司 | Method for reducing texture memory required in dynamic Chinese character generation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85100974B (en) | 1987-04-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1126423A (en) | Video display terminal with partitioned screen | |
| US4075620A (en) | Video display system | |
| US4742344A (en) | Digital display system with refresh memory for storing character and field attribute data | |
| US5815169A (en) | Frame memory device for graphics allowing simultaneous selection of adjacent horizontal and vertical addresses | |
| EP0012793A2 (en) | Method of displaying graphic pictures by a raster display apparatus and apparatus for carrying out the method | |
| EP0101716A1 (en) | Video computing system with automatically refreshed memory | |
| JPH03134700A (en) | Display unit | |
| US5539428A (en) | Video font cache | |
| EP0215984B1 (en) | Graphic display apparatus with combined bit buffer and character graphics store | |
| US3872446A (en) | Visual display system | |
| US4309700A (en) | Cathode ray tube controller | |
| KR860001450B1 (en) | Graphic display system | |
| US4937565A (en) | Character generator-based graphics apparatus | |
| US4737780A (en) | Display control circuit for reading display data from a video RAM constituted by a dynamic RAM, thereby refreshing memory cells of the video RAM | |
| US4706076A (en) | Apparatus for displaying images defined by a plurality of lines of data | |
| US4626839A (en) | Programmable video display generator | |
| US5329290A (en) | Monitor control circuit | |
| CN85100974A (en) | Displaying controller of chinese character | |
| US4281393A (en) | Programmable computer terminal system | |
| US5642136A (en) | Method and apparatus for screen refresh bandwidth reduction for video display modes | |
| US5068648A (en) | Display controller having a function of controlling various display memories | |
| JPS6073674A (en) | Data display | |
| EP0283579B1 (en) | Raster scan display system with random access memory character generator | |
| JP2708841B2 (en) | Writing method of bitmap memory | |
| KR880001082B1 (en) | Low table adressing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| SE01 | Entry into force of request for substantive examination | ||
| PB01 | Publication | ||
| C06 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |