JPH0664513B2 - Memory controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a device for electrically coupling a programmable controller (hereinafter referred to as a PC) and a CRT terminal device,
In particular, the present invention relates to a memory control device capable of efficiently using the usable range of the PC memory.

B. Summary of the Invention This invention is a memory control device that controls the memory of a PC with limited memory capacity so that it can be used efficiently, and the output of the coarse division setting memory is selected by light pen position address information, and the Read the corresponding information from the memory,
The range of use is limited by extracting screen type information from the read information and using the extracted information to obtain information corresponding to the screen type from the auxiliary memory in which the information is stored and set in advance. It is designed to allow efficient use of PC memory.

C. Conventional technology Conventional control systems that used CRT terminals required sophisticated computer technology. However, in recent years, with the remarkable progress of the microcomputer technology, an easy-to-use CRT terminal device has emerged in which the microcomputer is built in the CRT terminal side and the main screen control can be easily performed. Such a CRT terminal device is being used in combination with a PC that does not require knowledge of software and can easily write to and read from a memory.

D. Problems to be solved by the invention As described above, the memory of the PC can be easily written and read, but the capacity of the memory provided in the PC is limited. Will run out. For example, 4000 pixel CRT display (X axis direction 80, Y
When using the axial direction 50, 80 x 50 = 4000), the number of light pen positions is 4000 per screen. Generally, multiple screens are required, so in order to decode the operator's intention from the position of the light pen according to the CRT screen, a list in which the operator's intention is set in advance in the memory area of 4000 × the number of screens is created and stored in memory. Must be stored in. Here, if the number of screens is 20, 4000 × 20 = 80,000 memory addresses are required, which is impractical. Further, even if the number of screens is left as it is, even if the number of screen types is reduced to, for example, 4, the memory address of 4000 × 4 = 16,000 is required, which greatly exceeds the memory capacity of the PC and is not practical.

E. Means for Solving Problems The present invention divides the data for roughly dividing the light pen position information that has been subdivided into pieces for each x-axis and y-axis information, and stores the data in the memory of the PC. Based on the specified address information from the light pen, the coarse division information corresponding to that address is extracted for each x-axis and y-axis, and only the information of the specified number is extracted from the extracted information by the CRT screen type specification number. The information of the designated number is used to retrieve desired information from one of a plurality of preset memories.

F. Action First, a conversion table for roughly dividing the light pen position information that has been subdivided is prepared in the memory of the PC for each screen type for both the x-axis and the y-axis. The information thus stored in the memory is read according to the designated address information of the light pen, and the coarse division position information designated by the address is read out including the CRT screen type. Next, when the screen type designation number is given to the above information, only the coarse division position information corresponding to the corresponding screen is obtained.
Only the desired information is taken out from the memory in which the information in which the intention of the operator is set in advance for each screen type is stored using the coarse division position information. By operating in this way, the memory capacity of the PC is not increased.

G. Embodiment In FIGS. 1 and 2, reference numeral 1 is a PC memory, and this memory 1 is a coarse division setting memory 1x in the X-axis direction of the CRT screen as shown in FIGS. 3 and 4 in detail. It is composed of a coarse division setting memory 1y in the Y-axis direction. The outputs of both setting memories 1x and 1y are supplied to the memory selection switching units 2x and 2y.
Based on the information of the predetermined address of the light pen position memories 9x, 9y given to x, 2y, the information of the predetermined address of both the setting memories 1x, 1y is read and input to the first output units 3x, 3y. The information of the first output section 3x, 3y is selectively switched by the screen type switching sections 4x, 4y according to the screen type designation information A to D, and the switching section 4
It is input to the second output units 5x, 5y of x, 4y as coarse division position information only for the designated screen type. 6a to 6d are memories in which the operator's intention is set according to the screen types A to D.
Outputs from 6d to 6d are given to the memory selection switching sections 7a to 7d, and desired information is read out from the operator intention setting memories 6a to 6d by the coarse division position information for the designated screen of the second output sections 5x and 5y. It is input to the third output units 8a to 8d. For example, in FIG. 2, the information B (I, J) at a predetermined address of the operator's intention setting memory 6b of the screen type "B" is read and input to the third output unit 8b. Note that FIG. 2 is a specific example of FIG. 1, and in FIG. 2 only the case where the screen type designation is “B” is shown. Moreover, the subscripts attached to the respective characters in FIG. 2 indicate the addresses.

The coarse division setting memory shown in FIGS. 1 and 2 is made as follows. As an example, in the case of a CRT screen that is subdivided into 80 in the X-axis direction and 50 in the Y-axis direction, the number of pixels is 4000, so the position of the light pen is 4000. The position of the light pen
If 4000 is left, it is troublesome to detect the intention of the operator. Therefore, if the position is roughly divided into 80 ways (when the X-axis direction is 10 and the Y-axis direction is 8), the light pen position is set. The maximum number is 80. The screen rough division is performed as follows. From the CRT terminal device, 0 to 79 types of information in the X-axis direction and 0 to 49 types of information in the Y-axis direction are input to the PC.

Therefore, in the above case, 0-79 is changed to 1-10 in the X-axis direction,
It is necessary to convert 0-49 to 1-8 in the Y-axis direction. Therefore, a conversion table is prepared in an area in the main memory as shown in the memory of FIG. By doing so, the rough division policy explanatory diagram shown in FIG. 3 can be easily obtained. Note that FIG. 4 is a block diagram of the coarse division setting memory. In this figure, the right end of the memory is a conversion table, and x → X y
→ The rough division policy of Y or the addresses in the x-axis direction and the addresses in the y-axis direction corresponding to four types of screens are input in advance.

FIG. 5 is a memory setting diagram in which the operator's intention corresponding to screen type B has been input in advance (of course, this figure is a schematic example and this character is actually symbolized). The operator's will can be drawn out by using the figure.
In this case, the required memory area is 0 to 79 = 80 for rough division in the X-axis direction, 0 to 49 = 50 for rough division in the Y-axis direction, and 10 x 8 = 80 for setting the operator's intention. Total 80+
50 + 80 = 210 will be occupied.

Next, the operation of FIGS. 1 and 2 will be described. When the operator directs the light pen to a CRT screen (not shown), position information of the light pen is input to the light pen position memories 9x and 9y. Information input to this memory 9X, 9y xi, yj (i, j
Is an address and 0 to 79,0 to 49) are given to the memory selection switching units 2x and 2y. The information XAi ~ XDi, YAj ~ YDj at the i, j address is the first
It is input to the output units 3x and 3y. Information XAi of the first output section 3x, 3y
~ XDi, YAj ~ YDj are selectively switched if B is specified in the screen type specification information supplied to the screen type switching units 4x, 4y,
The information XBi, YBj is input to the second output units 5x, 5y. This information
XBi and YBj are given to the memory selection switching unit 7b to read the information corresponding to the address i, j from the memory 6b and input it to the third output unit 8b.

Controlling the memory as described above has the advantage that the PC can be fully used without increasing the memory capacity of the memory and the memory area is extremely small.

In the above embodiment, the case where the CRT screen structure is roughly divided into 8 × 10 has been described. However, from the CRT screen structure, not all the coarse division methods are provided for each target screen. Eg 6
A configuration of × 12, 5 × 8 is also required. The memory area for such a screen configuration is as shown in the following table.

The memory area as described above can be further compressed as shown in FIG. In FIG. 4, when applied for 8 × 10,
For example, if x = 1 is entered in the light pen position information, x
Read the contents equivalent to axis "1", and And the AND operation with the contents of You can get out what you want. As a result, the memory area of 130 can be realized while the memory area of 390 was required for the rough division of the x-axis and the y-axis.

H. Effects of the Invention As described above, according to the present invention, the output of the rough division setting memory is selectively switched by the light pen position address information, the information corresponding to the selected address is read from the memory, and the information is read from the information. Since the information in which the desired screen type has been input is taken out and the memory is controlled so as to obtain the information corresponding to the desired screen type from the preset memory based on the taken out information, the range of use is limited. There is an advantage that the memory of the PC can be used efficiently.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a concrete embodiment of FIG. 1, FIG. 3 is a rough division policy explanatory diagram, and FIG. 4 is a coarse division setting. Memory block diagram,
FIG. 5 is a memory setting diagram in which the intention of the operator is input in advance. 1 …… Memory, 1x, 1y …… Coarse division setting memory, 2x, 2y ……
Memory selection switching section, 3x, 3y ... 1st output section, 4x, 4y ... Screen type switching section, 5x, 5y ... 2nd output section, 6a-6d ... Operator intention setting memory, 7a-7d ... ... Memory selection switching section, 8a-
8d …… 3rd output section, 9x, 9y …… Light pen position memory.

Claims (1)

[Claims] 1. A memory provided with a memory conversion unit capable of converting the CRT screen rough division information into a memory address set corresponding to a CRT screen pixel, an output of this memory and a light pen position address on the CRT screen. Information and the first memory selection switching unit for reading out the contents of the memory address corresponding to the light pen position address information in the output, and the memory contents and screen type designation sent from the first memory selection switching unit. Information, and a screen type switching unit for taking out the contents of only the screen type designation information, an operator intention setting memory in which various contents are preset and stored in accordance with the screen type designation information, and this setting memory And the output of the screen type switching unit, and the content corresponding to the address of the output of the switching unit is read out.