CN85107553A - The mixing of line drawings and text in CRT display system - Google Patents

Abstract

The present invention relates to a kind of method and hardware.Be used for by the figure line occurrence logic being provided for existing character occurrence logic and the figure line data being mixed with common text video data and synchronously.Make existing character computer system increase the figure line ability.

Description

The mixing of line drawings and text in CRT display system

Present invention relates in general to the display capabilities of line drawings and text in the data handling system, more particularly, relate to allow text and line drawings, a kind of method and the hardware unit that mix as curve map, process flow diagram, synoptic diagram etc.

Computer system of the prior art not only has the ability that shows text, also has the ability of simple line drawings of demonstration such as curve map, process flow diagram, synoptic diagram etc.This logic with figure line generating ability is to close as a whole with the logic with text generating ability.Therefore, the buyer of a computer system of having only the text occurrence logic must remove this text occurrence logic and replace text and the occurrence logic of figure line combination in order to obtain the ability that text/figure line combines.This technology has stayed the wiring board of a unnecessary text occurrence logic to buyer.Therefore, people wish to have a system, and wherein the text occurrence logic still is retained in the principal computer and only by providing the figure line logic card to increase the figure line ability.So needed is a kind of method and hardware, so that the figure line data can be mixed with the common text video data that has in the computer system of prior art and synchronously.

A basic purpose of the present invention is to obtain the display system that a kind of improved figure line and character combine.

Further aim of the present invention is to obtain a kind of improved figure line display system, wherein has the figure line data are mixed and synchronous device with existing text video data.

Further object of the present invention provides a kind of method and hardware that increases the figure line ability for existing character display system.

The invention discloses a kind of method and hardware, this method and hardware increase the figure line ability by the figure line occurrence logic being provided for existing text occurrence logic and the figure line data being mixed with common text video data with synchronously on existing character ability.Referring to Fig. 1, finishing the method for this purpose and hardware comprises negative or door 109(negative oR gate the most basically), with door 116 and 117, and rejection gate 118, be used for producing a vision signal and the vision signal that signal and existing text occurrence logic are produced being carried out inclusive-OR operation from the figure line options, thus that text and figure line is overlapping on the cathode-ray tube (CRT) of monochromatic display tube.

In claim subsequently, stated the new feature that constitutes characteristic of the present invention particularly.Invention itself with regard to its structure and operation, can get the best understanding with reference to following description in conjunction with the drawings.

Fig. 1 is logic block-diagram of the present invention.

Referring to Fig. 1, be depicted as logic block-diagram of the present invention.When Fig. 1 is described the character occurrence logic will be discussed at first, be the figure line occurrence logic then, and the figure line occurrence logic how combine with the character occurrence logic with overlap or the image of character and figure line independently.By using demonstration to allow signal DSPENA-00 to realize the synchronous of text from the character generator 106 that is connected with figure line logical one 11.

Data RAM 102 is random access memory, wherein goes up the order that shows according to character at cathode-ray tube (CRT) (cathode-ray tube (CRT) is not shown) and has stored character code.Feature RAM101 is a random access memory that is used to store feature code, and this feature code is represented the specific function that should carry out character selected among the RAM102.For example, for outstanding word, may wish to make this word " flicker " on cathode-ray tube (CRT), or be marked underscore, or be increased the weight of.This is to finish by identical address of contact in the feature RAM101 with special feature code, and this feature code can interrelate with the selected character that is stored in the data RAM 102.The character code that is stored among the RAM102 is used for carrying out the information addressing by data register 104 at character generator 106 as the address.Therefore, the selected character code of reading from data RAM 102 is stored in the data register 104.If wish a feature code and the specific character of selecting from data RAM 102 are interrelated, then will be stored in the feature register 103 from the output of feature RAM101.The character code that is stored in the data register 104 is an eight bit code, therefore can produce in character generator 106 up to 64 different characters by discrete cell in the character generator of storing selected character information is carried out addressing.Each character that is produced requires fully to be described with 9 vertical pixels by 7 horizontal pixels, promptly has 63 pixels altogether.This matrix of 7 * 9 is so that the interval of character and row to be provided within one 9 * 12 matrix.Each character is (part) generation one by one along with the scanning of each horizontal line of traversing cathode-ray tube (CRT).In order to finish complete delegation with a plurality of character parts, to represent the sequence address of a plurality of characters that should occur in order to select from data RAM 102 and sequentially deposit in the register 104, this register carries out addressing to character information successively in character generator 106.In order to produce a complete line character, requiring has 12 scan lines, and the number that can certainly utilize other is as 9 row.Correspondingly, cathode ray tube controller (CRTC) 105 produces 4 grating signals, these signals be enough to select up to 16 raster scannings capable-more than desired 12 row of each character.Along with each continuous raster scanning is capable selected and traverse video screen and scan, the increase of each sequential addressing character partly promptly is added into, yet, along with each scan line traverses video screen, character generator 106 only produces the each several part of each character that is addressed, until having finished latter two scan line, all selected characters are appeared on the video screen.Along with each character is addressed in the process of each scan line, the output of character generator 106 is applied on the shift register 107.These be exactly should show on the video screen be used for grating capable on the text numerical digit of a specific part, and be to represent by video output signals VIDOUT+OO.This video output signals is applied on text feature and the video mix logical one 08.If there be the feature code relevant with the character that should produce, this feature code signal also is applied on text feature and the video mix logical one 08.Some characteristic characters comprise high brightness, flicker, blanking, reverse function etc.Be applied on text feature and the video mix logical one 08 also have show allow signal DSPENA+OO(text feature and video mix logic be used to mix text takes place and the General Logic of feature functionality and known in this area).Correspondingly, when VIDOUT+00 signal and DSPENA+OO signal are applied to text feature and video mix logical one 08, produce a VIDE03-00 signal, this signal is represented as the necessary data pulse of part that produces the selected character on the specific scan line.If also wish a specific feature functionality, feature code is applied on text feature and the video mix logical one 08 so that for the character that is produced provides specific function, as flicker etc.Then the VIDE03-00 signal be applied to negative or door 109 on.

In order character to be mixed with figure line also synchronously, a figure line signal must be applied on the other end of negative or door 109.This carries out in the following manner.The figure line logic selects 111 an output signal VIDDOT-00 to be provided and to carry the figure line pulse that will be used for showing figure line on video screen.The VIDDOT-00 signal is anti-phase and be applied on the Sheffer stroke gate 114 by driver 113.A Peripheral Interface adapter 112 is normally being controlled the peripheral hardware operation of whole computer system; It provides a signal E * VIDE+00 for the present invention, shows that to computer system the figure line options is inserted into and moves when this signal is high level.E * VIDE+00 signal is applied on another input end of Sheffer stroke gate 114.Correspondingly, when the figure line options was inserted into, signal E * VIDE+00 was a high level; Therefore the output terminal of Sheffer stroke gate 114 provides an output signal E * VDOT-00.This signal is carrying the serial figure line pulse that shows on the cathode-ray tube (CRT) (not shown).E * VDOT-00 signal is applied on another input end of negative or door 109 then; Like this, two input signals, one is carried textual data and another carries the figure line data and mixes so that an output signal VIDE03-OX to be provided at negative or door 109.The VIDE03-OX signal had both carried the figure line that will show and had also carried the text that will show, they can be overlapped also can the phase non-overlapping copies, so promptly realized one object of the present invention.

At this moment still need adjust the VIDE03-OX signal so that the brightness of the point that operator's eyes are felt shows evenly.For example,, compare it with the background of monochrome and will seem very bright, even the brightness of series of points is identical on its brightness and the same background if only occurred a point on the video screen.Join the central obstruction logical one of text occurrence logic 10 and carry out these functions.Therefore, second portion of the present invention is that the hardware of figure line signal with control brightness is mixed mutually so that make figure line and text all have even demonstration.The logic of carrying out this function comprises and door 116,117 that they are connected on the rejection gate 118, and text vision signal VIDE03+OO is the inversion signal of former VIDE03-OO signal, and it is applied on the end with door 116.Low brightness signal LOWINT-OO from text feature and video mix register 108 is applied to the other end with door 116.Therefore, if require a high-brightness signal, low brightness signal LOWINT-00 is a high level, similarly, figure line signal E * VDOT-OO from the figure line logic is become E * VDOT+10 signal by phase inverter 115 counter-rotatings, and this signal is applied to an input end with door 117.In addition, from the figure line logic show characteristic signal low or high brightness E * VLOW-00 be applied to door second leg of 117 on.Therefore, if any requires high-brightness signal in text or the figure line, will be high level with door 116 or with the output of door 117.Therefore, in this case, the output of rejection gate 118 will be low level, produce signal HIGINT-07.This signal is applied to obstruction and makes by the VIDE03+00 signal in logic or be high level by the point of E * VDOT+10 signal representative then, thereby will be brighter on video screen, if high-brightness signal HIGINT-07 is a low level.Like this, this signal is applied to and hinders on the logical one 10, and this logic provides the point of a suitable high or low brightness on video screen.

Claims (7)

1, a kind of calculator display organization of character display text and figure line simultaneously that is used on cathode-ray tube (CRT) comprises:

A) being used to produce first of character text installs;

B) being used to produce second of figure line installs; With

C) be connected with above-mentioned first and second devices and be used to mix the 3rd device of above-mentioned character text and figure line.

2, the calculator display organization described in claim 1 comprises and is used to produce characteristic information so that the 4th device that shows simultaneously with above-mentioned character text and figure line on above-mentioned cathode-ray tube (CRT).

3, the calculator display organization described in claim 2, wherein said first device comprises a data RAM, is used to store the character text that will show on above-mentioned cathode-ray tube (CRT).

4, the calculator display organization described in claim 3, wherein said first device further comprises a character generator, is used to be created in the character that shows on the above-mentioned cathode-ray tube (CRT).

5, the calculator display organization described in claim 4, wherein said second device comprises the figure line logic, this logic is used to produce the figure line that will show on above-mentioned cathode-ray tube (CRT).

6, the calculator display organization described in claim 5, wherein said the 3rd device comprise a negative or door, a plurality of and door and a rejection gate, and they are connected so that the character text is mixed with figure line with above-mentioned first and second devices.

7, the calculator display organization described in claim 6 comprises the 4th device that is connected with above-mentioned the 3rd device, is used to be adjusted at the above-mentioned character text and the size of figure line and the variation of brightness that show on the above-mentioned cathode-ray tube (CRT).

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