JPS6032090A - Crt display terminal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a raster scan type CRT display terminal device having a memory for temporarily storing data to be displayed and displaying characters, symbols and images (turns). It is.

Conventional configuration and its problems Conventionally, in a CRT display device that has a memory (hereinafter referred to as fresh memory) that temporarily stores data to be displayed, an address is given to the memory and the read data is converted directly into a video signal. Alternatively, if you have a Butter 7 memory that stores the display font in advance, give that data as the address of the turn memory and convert the data read from the turn memory into a video signal, It is displayed on the CRT.In addition to the refresh memory, (if it has a turn memory, the display font to be displayed) is transferred from the turn memory to the refresh memory, and the data read from the refresh memory. is converted into a video signal and displayed on a CRT. A lock diagram of the conventional example is shown in Fig. 1. In FIG. 1, 101 is a microprocessor (MPU) that controls the entire system.

106 is a refresh memory that temporarily stores bit image data to be displayed; 106 is a P/S that converts data 116 from the refresh memory from parallel to serial;
A conversion unit 102 is a CRT control unit (CRTC) that generates signals necessary for displaying on a CRT, 103 is a synchronization signal not to be displayed on a CRT (vertical synchronization signal 110, horizontal synchronization signal 111, display signal 112), and The image signal 114 is
A video control unit 107 that converts the video signal 113 into a video signal 113 that cannot be displayed on the RT includes a pattern memory that stores the bit pattern data of the display 7 font, and the code data of the display font to be displayed and the code data of the display font to be displayed. A data write control section 104 controls the address for writing data and the data to the refresh memory based on the address information corresponding to the display position to be displayed. 117 is the bit pattern data of the display font to be displayed; Write instruction signals 108 and 109, which instruct the start of writing, are the data bus and address node of the microprocessor, respectively. Also, the address given to the refresh memory always corresponds to the position on the screen, and Display at any location is possible by controlling the address.

In FIG. 1, bit pattern data of a display font to be displayed on a CRT is stored in a refresh memory 105.
When transferring the code data to the write command control unit 107 from the microprocessor 101, the code data of the display font to be displayed and the address information corresponding to its position, such as the start address of writing, are first given, and the write control is performed using that information. The unit 107 generates a write address outside the display section displayed on the CRT in the horizontal scanning section, synchronizes the bit pattern data of the display font to be displayed from the pattern memory with the address, and stores it in the refresh memory 106. Turn data is written exactly in the display font to be displayed. However, the write control unit requires a data group such as turn coat 1 of the display font and address information corresponding to the display position for each display font display, and this data group is sent from the microprocessor 101 each time the display font is displayed. You have to set it up. For example, when trying to display a large number of characters or other display fonts at once on a CRT display device, the microprocessor must run a program for displaying each character, and the microprocessor must concentrate on displaying that character. However, there is a problem that the microprocessor is used less efficiently.

Purpose of the Invention The present invention provides a control unit for overall control in a CRT display terminal device that displays character patterns such as kanji with a large number of characters as a man-machine interface. For example, the purpose is to reduce the burden of processing related to displaying characters on a microprocessor.

Structure of the Invention The present invention provides a computer system having a main control section such as a microprocessor.
In the RT display terminal device, a refresh memory temporarily stores bit image data to be displayed on CR'r, a pattern memory stores bit pattern data of a display font, and pattern code data of a display font to be displayed and the pattern code data to be displayed. It has a buffer memory that temporarily stores a data group for display such as address information corresponding to the display position, and when displaying a display font on a CRT, the data can be stored from the buffer memory without going through the microprocessor of the main control unit. Reads a data group such as the pattern code data of the display font to be displayed and its address information, and transfers the bit pattern data of the display font specified by the data group from the pattern memory to the refresh memory at the specified address position. According to
Processing related to the display of display fonts is performed independently of the main control unit, and by storing data related to the display of multiple display fonts in the buffer memory, it is possible to continuously display multiple display fonts. It is something.

DESCRIPTION OF THE EMBODIMENTS FIG. 2 shows a block diagram of the structure of an embodiment of the CRT display terminal device according to the present invention, and FIG. 3 shows the state of data in the buffer memory. In FIG. 2, 2o1 is a microprocessor (MPU) that controls the whole, 2015 is a refresh memory that temporarily stores the bit imitator to be displayed, and 206 is a P/S converter that converts data 221 from the refresh memory from parallel to serial. Part, 2
02 is a CR that generates the signals necessary to display on the CRT.
A T control unit (CRT C) 203 outputs synchronization signals (vertical synchronization signal 212, horizontal synchronization signal 21) for display on the CRT.
32 display signal 214) and an image signal 216 into a video signal 215 for display on a CRT; 207 includes a pattern memory storing pit pattern data of a display font; A data write control unit controls the address for writing data and data to the refresh memory based on the font code data and address information corresponding to the display position to be displayed, and 204 is a readout unit for display provided to the refresh memory. 217 and a write address 218 for transferring data from the pattern memory to the refresh memory, and an address control unit that provides an address 219 to the refresh memory; 220 is a pit pattern of the display font to be displayed; data, 225 is a write instruction signal that instructs to start writing, and 208 is a buffer memory that temporarily stores a group of write data including code data of display font data to be displayed and address information corresponding to the display position to be displayed. , 224 is the address to be given to the buffer memory, 222 is the data successively output from the buffer memory, 223 is the address for reading the write data group from the buffer memory 208, and 2o9 is the address for switching the address given to the buffer memory, etc. Bus control units 210 and 211 that perform control are a data bus and an address bus of the microprocessor, respectively. In addition, the address given to the refresh memory always corresponds to the position on the screen, and displaying at any position on the screen can be done by controlling the address. In addition to code data of the display font and address information corresponding to the display position, continuation flag data indicating whether the display font is continuous is provided. In Figure 3, pattern code ■.

■ represents the code data of one display font to be displayed, and address data ■, ■, ■, ■ corresponds to the display position to be displayed, such as the start address when writing data. For example, the modification data is information on whether to enlarge or reduce the size, and the continuation flag data is data indicating whether there is data of the display font to be displayed next. “Continue”, otherwise “End”
shows. The addresses in FIG. 3 indicate, for example, the addresses of each data for display when the address in the microprocessor of the first address of the data for display of the display font in the buffer memory is $9000. A detailed explanation of the present invention will be given below. In FIG. 2, when newly displaying 7 onts on the CRT, the microprocessor 201 first controls the code data of the 7 onts to be displayed (code data 2 in FIG. 3).

■), address information corresponding to the display position (address data ■, ■, ■, ■ in Figure 3), and a group of write data such as continuation flag data are determined in advance for writing in the buffer memory 208. If there is no other display font to write or display than the data you just wrote, the continuation flag data will indicate "6 end". , if there is a display font, the continuation flag data is set to indicate "continuation".Next, in response to the write instruction signal 226 to the write control unit 207, the write control unit 207 predetermines the font for writing in order to read it. The stored address 223 is given to the buffer memory through the bus switching unit 209, the data 222 is read from the buffer memory 208, and the display font data shown in FIG. 3 is transferred to the write control unit. The write control unit 207 sets the display 7 ont writing address 218 to the refresh memory 206 through the address control block 204 and cuts out the 7 lag between continuation and termination based on the continuation flag data. 219, and in synchronization with that address, bit pattern data of the display font is given as transfer data 220 and written into the display font pit pattern data refresh memory 206.The new display 7 bit pattern data written in the refresh memory 206 is The display data including the bit pattern data is converted into a serial image signal by the P/S converter 206, and converted into a video signal suitable for the CRT display device that displays the data by the video controller 203. Display on the screen. After the process for displaying one display font is completed, if the continuation flag in the write control unit 207 indicates continuation, the display font including the continuation 7 lag data is read again from the buffer memory 208. Read the data, set the data to display the display font, and set the continuation flag.After that, the operation is as described above.7 Transfer the bit pattern data of the display font to the receipt memory 205 and display it on the CRT. By continuing to set the continuation flag data to continuation in this way, a number of display fonts can be displayed continuously at arbitrary positions on the screen within the capacity of the buffer memory.

When the display of one display font is finished and the continuation flag at that time indicates the end, read data for displaying the display font from the buffer memory and display it 7
The series of operations for transferring the data to the refresh memory ends. In this embodiment, the processing performed by the microprocessor includes setting data for displaying a display font in the buffer memory, setting continuation flag data, and outputting a write instruction signal.
If there are many fonts, the microprocessor can perform other processing after setting the display data and continuation 7 lag data and outputting the write instruction signal, and the display font to be displayed. , if the display positions are the same, the display operation can be realized using only the write instruction signal.

Effects of the Invention The present invention brings about the following effects3(
1) In a high-definition CRT display terminal device having a control section such as a microprocessor, when displaying the same group of 7 onts, the processing of the control section related to display can be reduced. In addition, (2) in a non-definition CRT display device that has a control unit such as a microprocessor, when trying to display many display fonts at once, the processing of the control unit is not involved only in the processing for display. It's over.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the storage state of data in the buffer memory of an embodiment of a conventional CRT terminal device. 201...Microprocessor, 2o2...
... CRT control section, 203 ... Video control section, 2o4 ... Address control section, 2o6 ...
...Refresh memo L 206...P/E3
Conversion unit, 2o7...Data write control unit, 20
8...Buffer memory, 209...
Bus switching section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Scope of Claims] A first memory for temporarily storing image data to be displayed on a CRT, and a display font. If the bit pattern data of the display font to be displayed is transferred from the second memory to the first memory and displayed on a CRT, the second memory stores bit pattern data. There is a data group for display that includes at least a pattern code to be given to the memory and address information for an address generation unit that generates an address to be given to the first memory, and a data group for display that follows the data group. One unit is continuation flag data indicating whether or not the same is true, and a third memory capable of temporarily storing a plurality of units is provided, and the data group for display and the continuation flag data are read from the third memory. Place it aside.