JPS60173624A - Printer controller for hard copy of crt screen - Google Patents

Abstract

PURPOSE:To display a waveform without using a special printer by using a conventional printer having a graph mode, reading the content of a video memory and using a dot pattern to print out waveform information in the graph mode. CONSTITUTION:The video information for patterns' share displayed on a CRT is stored in the video memory 1 and a read means 2 reads the video information of the video memory 1. A preceding bit storage means 3 stores the video information read at one preceding information among the video information of the video memory 1 read by the read means 2. A converting means 4 compares an output of the preceding bit storage means 3 with the video information read by the read means 2 and when the results of comparisor are dissident, that is, in case of [01] or [10], a line ''1'' is outputted to draw a leading line or a trailing line. When the results of comparison are coincident, that is, in case of [11] or [00], it is checked that the value is logical 1, and when the value is logical 1, an upper side point to draw a line at the upper side and when logical 0, the lower side point to draw a line at the lower side is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a printer control device for printing waveforms and characters displayed on a CRT screen.

(b) Purpose of the Invention A video printer is a device that prints waveforms and characters displayed on a CRT screen. This video printer is C
Although it is possible to print what is displayed on the RT screen, there is a problem in that it is not possible to print what is not displayed on the CRT screen because it is directly driven by a video signal.

This invention reads the contents of video memory, converts the information, and outputs it to a regular printer, thereby making it possible to print items that are not directly displayed on a CRT screen without using a special printer. This is what I did.

(C) Embodiment of the Invention First, a block diagram of a first embodiment of the invention is shown in FIG.

1 in Figure 1 is a video memory, 2 is a reading means, 3 is ni
4 is a converting means, and 5 is a printing means.

A video memory 1 shown in FIG. 1 contains video information for a screen displayed on a CRT, and a reading means 2 reads out the video information from the video memory 1.

The video information is, for example, rlloollooJ, where rllJ has lines arranged at the top in the horizontal direction.
"00" indicates a barking condition in which the glands are arranged in the lower position laterally.

"01" indicates a rise from bottom to top, and rlOJ indicates ta of a fall from top to bottom.

Therefore, the waveform of rl 1001100J is shown in FIG. 2.

On the printer, the waveform is expressed by sequentially combining the upper point ".", the lower point "." and the "1" symbol as shown in FIG.

The previous bit storage means 3 in FIG. 1 stores the video information that was read out one previous time among the video information in the video memory 1 read out by the reading means 2.

The converting means 4 compares the output of the previous bit storage means 3 with the video information read out by the reading means 2, as shown in FIG.
1'' is output to the printing means 5.

The printing means 5 sends a code for setting the printer to the graphic mode, as shown in FIG. 6, which will be described later.
Outputting the converted graphic data Next, a flowchart of the reading means 2 is shown in FIG.

In step 11 of FIG. 4, it is determined whether the video memory 1 has reached its end.

In step 12, video information is read from the video memory l.

In step 13, the video memory address is set to +1.

In step 14, the conversion means 4 is called.

Next, a flowchart of the converting means 4 is shown in FIG.

In step 15 of FIG. 5, the output of the previous bit storage means 3 and the video information read out by the reading means 2 are compared.

When the comparison result in step 15 is a mismatch, in other words, when it is "Ol" or "10J," in step 16, a contraction l111+ is output in order to draw a rising line or a falling line.

If the comparison result in step 15 is a match, step 17
to determine the match.

If they match, it is either "11" or [00], so in step 17 it is determined whether the value is "1".

When the value is "1", in step 18, "upper point fist" for drawing the gland upward is output.

If the value is not “1”, it is “00”, so step 19
outputs the lower point "・" for drawing a line on the lower side.

Next, a flowchart of the printing means 5 is shown in Figure 'm6.

In step 21 of FIG. 6, it is determined whether it is the beginning of a line.

Step 22 sends a code to put the printer into graphics mode.

In step 23, the converted graphic data is output.

In step 24, the process returns to the reading means 2.

Next, a configuration diagram of a second embodiment according to the present invention is shown in Section 7 1.

7, 31 is a video memory, 32 is a reading means, 33
34 is a determining means, 35 is a converting means, 36 is a printing means, and 37 is a mode storing means.

The video memory 31 shown in FIG. 7 contains waveform information, character information, and mogodo switching information, and the contents of the video memory 1 are read out by the reading means 32.

The waveform information stored in the video memory 31 in FIG.
This is the same video information as the video information stored in the video memory 1 shown in the figure. Therefore, the video memory 31 contains more text information and mode switching information than the video memory 1.

The reading means 32, previous bit storage means 33 and converting means 35 operate in the same manner as 1 to 3 in FIG.

As shown in FIG. 9, which will be described later, the determining means 34 determines the content of the mote switching information read out by the reading means 32, and outputs the result to the converting means 35 or the printing means 36.
Communicate to.

If the read mode switching information is for switching to graphics, the converting means 36 operates as shown in FIG. 5 and transmits the waveform information to the printing means 36 and entrance 36A shown in FIG. 10.

If the read mode switching information is not for switching to graphics, that is, if text information is to be printed,
Character information is manually input to the printing means 36.

The printing means 36 includes, as shown in FIG. 10, which will be described later.
There is an input 36A for printing waveform information and an input 36B for printing character information, each of which sends converted data to the printer.

The mode storage means 37 stores whether the printing means 36 is outputting waveform information or character information.

Next, a flowchart of the reading means 32 is shown in FIG.

8 is almost the same as FIG. 4, except that in step 14 of FIG. 4, the 5 converting means 4 is called, whereas in step 44 of FIG. 8, the determining means 34 is called out. differ.

Next, a flowchart of the determining means 34 is shown in FIG.

In step 45 of FIG. 9, it is determined whether the read information is mode switching information.

In step 46, it is determined whether to switch to graphics or ivy.

In step 47, it is determined whether the contents of the mode storage means 37 are graphics.

In step 48, connection is made to the conversion means 35.

In step 49, the printing means 36 is called and connected to the entrance 36#3.

Next, 1. A flowchart of the printing means 36 is shown in FIG.

Steps 50 to 53 in FIG. 1O correspond to the entrance 30A,
Steps 54-58 correspond to inlet 3811.

In step 5o, it is determined whether it is the beginning of the line.

In step 51, it is determined whether the mode storage means 37 is a graphic mode.

In step 52, a switch code to graphics is sent to the printer.

In step 53, the mode storage means 37 is set to graphic.

In step 54, it is determined whether the line is at the beginning.

In step 55, it is determined whether the mode storage means 37 is a graphic mode.

In step 56, a code for switching to character mode is sent to the printer.

In step 57, the mode storage means 37 is set to character mode.

In step 58, the read data is converted into a printer code.

In step 59, the converted data is sent to the printer.

In step 60, the process returns to the reading means 32.

(d> Effects of the Invention This invention uses a normal printer with a graph line, reads out the contents of the video memory, and prints a graph using a dot pattern for waveform information. Therefore, it is possible to express waveforms and characters without the need for a special printer such as a video printer, and it is also possible to print things that are not directly displayed on a CRT screen.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of the first embodiment according to the present invention, Fig. m2 is a diagram representing video information in waveforms, and Fig. 3 shows the upper point "・gauze", the lower point "・" and 111, N.
FIG. 4 is a flowchart of the reading means 2 of FIG. 1. 5 is a flowchart of the converting means 4 of FIG. 1, FIG. m6 is a flowchart of the printing means 5 of FIG. 1, FIG. FIG. 8 is a flowchart of the reading means 32, FIG. 8 is a flowchart of the determining means 34 of FIG. 7, and FIG. 10 is a flowchart of the printing means 36 of FIG. 1...Video memory, 2...Reading means, 3...Previous bit storage means, 4...
Conversion means, 5... Printing means, 31...
...Video memory, 32...Reading means, 33
...previous bit storage means, 34 ...determination means, 35 ...conversion means, 36 ...printing means, 37 ...mode storage means. Agent Patent Attorney Kin Omata Figure 1, Figure 2, Figure 3, Figure 5, Figure 6, PJ 1f 7 i', 1, 8, t=K, Figure 9

Claims (1)

[Claims] 1. A video memory for storing video information on a CRT; a reading means for reading out the video information;
! a converting means for comparing the output of the preceding bit storing means with the video information read by the reading means and converting it into data for printing;
1. A printer control device for a CRT screen display, comprising: printing means for outputting the printing data to a printer. ') - a video memory for storing waveform information, character information, and mode switching information to a CRT; a means for reading out the waveform information, the character information, and the mode switching information without reading them; a previous bit storage means for storing the previously read waveform information; a determination means for analyzing the content of the mode switching information read by the reading means; and a previous bit storage means when the determination means outputs the waveform information. a converting means for comparing the output of the means and the waveform information read by the reading means and converting it into print data; a printing means for outputting the print data to a printer; the printing means outputting the waveform information. 1. A printer control device for note copying on a CRT screen, comprising: a mode storage means for storing whether the character information is currently being outputted.