JPH04273289A - Display processor - Google Patents

Abstract

PURPOSE:To use common software by providing a text memory, a bit map memory, an input means, an address generating means, a storage means, an output means, a processing means, and a display means. CONSTITUTION:A specific address is generated by the generating means corresponding to text data which is inputted to store the text memory 5 with the input text data according to the generated address, and when the generated address is a specific address, an interruption signal is outputted. A character pattern corresponding to the text data stored in the text memory 5 is read out of a character pattern memory 9 according to the outputted interruption signal and developed on the bit map memory 6, and the storage contents of the bit map memory 6 where the character pattern is developed are displayed. Therefore, compatibility is obtained between software for display processing on a personal computer and software for display processing on a work station.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display processing device used in workstations and personal computers.

0002

2. Description of the Related Art Generally, in a personal computer, when a text code is written to a text memory starting from the address "B800:0", a text mode in which it is converted into a character pattern by hardware, and a CPU
Two types of graphics modes are supported: a graphics mode that writes character patterns directly to bitmap memory.

On the other hand, workstations have more display pixels than personal computers and are mainly in graphics mode, so they are not compatible with personal computers.

[0004] For this reason, the display processing software for a personal computer and the display processing software for a workstation are not compatible with each other, and are therefore separate software.

[0005]

[Problems to be Solved by the Invention] As described above, the present invention solves the problem that the display processing software of a personal computer and the display processing software of a workstation are incompatible and become separate software. A display processing device that eliminates the drawbacks of display processing and that is compatible with and can use common software between display processing software for personal computers and display processing software for workstations. The purpose is to provide

[0006]

[Means for Solving the Problems] A display processing device of the present invention includes a text memory in which text data is stored, a bitmap memory in which bitmap data is stored, and character patterns for each of various text data are stored. a character pattern memory, an input means for inputting text data, a generation means for generating a predetermined address according to the text data input by the input means;
Storage means for storing text data input by the input means in the text memory according to the address from the generation means; output means for outputting an interrupt signal when the address from the generation means is a predetermined address; processing means for reading a character pattern corresponding to the text data stored in the text memory from the character pattern memory and developing it in the bitmap memory based on the interrupt signal output by the output means; The apparatus comprises display means for displaying the stored contents of the bitmap memory in which character patterns are developed by the means.

[0007]

[Operation] In the above-described configuration, the present invention generates a predetermined address in response to input text data using the generating means, and stores the input text data in the text memory in response to the generated address. If the generated address is a predetermined address, an interrupt signal is output, and based on the output interrupt signal, a character pattern corresponding to the text data stored in the text memory is converted into a character pattern. The character pattern is read from the memory and expanded into the bitmap memory, and the stored contents of the bitmap memory in which the character pattern is expanded are displayed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a display processing apparatus according to the present invention used in workstations and personal computers. That is, the display processing device has a CPU 1 that controls the entire system, a ROM 11 that stores a control program and a character pattern expansion routine as an interrupt processing routine, and an interrupt that outputs an interrupt signal supplied from a decoder 3 to the CPU 1. a decoder 3 that generates an interrupt signal in response to a write pulse when an address at which a character pattern is to be written is specified, a memory controller 4 that controls the text memory 5, and a display content of the CRT display section 8. A bitmap memory 6 that is stored in bits, a CRT controller 7 that controls the display of the CRT display unit 8 according to the stored contents of the bitmap memory 6, and a character pattern memory that stores character patterns for each character. It is composed of a character ROM 9 and a bus 10 for transmitting control signals, addresses, and data between each section.

Next, the operation of such a configuration will be explained with reference to the flowcharts shown in FIGS. 2 and 3 and the timing chart shown in FIG. 4. That is, based on a designation from a keyboard (not shown) or the like, the CPU 1 determines whether to write a character code to the address "B800:X" of the text memory 5, and outputs the address to the decoder 3 via the bus 10. When the decoder 3 receives a write pulse from the CPU 1, it generates an interrupt signal for the write address "B800:X". The interrupt signal from the decoder 3 is output to the CPU 1 via the interrupt controller 2. Further, the write address “B800:X” is also output to the memory controller 4. As a result, when the memory controller 4 is supplied with the write pulse, the memory controller 4 writes the CP to the write address.
Store text data (text code) from U1.

Then, the CPU 1 refers to the contents of the address "B800:X" of the text memory 5, that is, the text data, in response to the supplied interrupt signal, reads out the corresponding character pattern from the character ROM 9, and converts the read character pattern into bits. Expand to map memory 6.

When this expansion is completed, the CPU 1 controls the interrupt controller 2 to stop the interrupt signal and terminate the interrupt routine.

The character pattern developed in the bitmap memory 6 is then transferred to the CRT controller 7.
It is displayed on the RT display section 8.

As a result, the CPU 1 can display characters on the CRT display section 8 just by writing data into the text memory 5. That is,
Text memory can be used without using hardware to develop character patterns in response to display refreshes. Character patterns can be developed using text mode software as is. This allows common software to be used between personal computers and workstations.

As mentioned above, text memory can be used without special hardware, and there is compatibility between display processing software for personal computers and display processing software for workstations. , common software can be used.

In the above embodiment, the interrupt processing routine is stored in the ROM, but it may also be stored in the RAM.

Furthermore, although the interrupt signal is supplied to the CPU, the interrupt signal is not limited to this, and is supplied to another CPU that executes character expansion.
It may also be supplied to the PU. Further, the development of this character may be handled using a DMAC (Direct Memory Access Controller) or the like. Furthermore, an interrupt signal may be used for starting this DMAC.

[0018]

[Effects of the Invention] As detailed above, according to the present invention,
It is possible to provide a display processing device in which display processing software for a personal computer and display processing software for a workstation are compatible and can use common software.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing the overall configuration of a display processing device in an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation in the embodiment of FIG. 1;

FIG. 3 is a flowchart for explaining interrupt processing operations in the embodiment of FIG. 1;

FIG. 4 is a timing chart for explaining interrupt processing operations in the embodiment of FIG. 1;

[Explanation of symbols]

1...CPU, 2...Interrupt controller, 3...Decoder, 4
...Memory controller, 5...Text memory, 6...Bitmap memory, 7...CRT controller, 8...CRT
Display section, 9...Character ROM, 10...Bus, 11...R
OM.

Claims (1)

[Claims] 1. A text memory that stores text data, a bitmap memory that stores bitmap data, and a character pattern memory that stores character patterns for each type of text data.
an input means for inputting text data; a generation means for generating a predetermined address in accordance with the text data input by the input means; and a generation means for generating the text data input by the input means in accordance with the address from the generation means. storage means for storing in the text memory; output means for outputting an interrupt signal when the address from the generation means is a predetermined address; processing means for reading a character pattern corresponding to text data stored in the character pattern memory from the character pattern memory and developing it in the bitmap memory; A display processing device comprising: a display means for displaying a display.