JPS5926060B2 - data processing equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention provides, for example, when performing data processing on an electronic computer,
The present invention relates to a device that efficiently implements arithmetic processing while maintaining the character code system for data on a file expressed in a unique character code system.

In data processing using electronic computers, a set of character codes are specified to be used to express data on external media such as magnetic disks and magnetic tapes. Currently, character codes such as JIS, EBCDIC, and ASCI are specified. Various types of code sets are used, such as engineering.

On the other hand, a computer has its own character code, and conversion between the character code on an external medium and the computer's 10-character code is usually performed when the computer performs input processing and output processing; Processed using the unique character code.

However, specific processing within a computer, such as character size comparison, cannot be performed using the computer's character code because the character order is disrupted in the conversion process15, so it must be returned to the character code on an external medium. After that, it must be done using the character code on the external medium. In order to realize such processing, in the past, dedicated machine language instructions (for example, M system 360
This is accomplished using the Translate command, which requires (1) a dedicated machine language instruction for conversion; (3) Machine language instructions for conversion must be inserted into the procedure division depending on the character code of the data. (4) Since the conversion procedure is performed by executing machine language instructions, the conversion speed decreases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a 35 apparatus that performs the above-mentioned conversion process at high speed.

Another object of the present invention is to provide a data processing device in which the code specification is provided on the data side and is separated from the instruction side.

Still another object of the present invention is to provide a data processing device that can implement the above conversion process at the firmware level.

That is, the present invention provides a data descriptor that includes an external character code specification section that specifies an external character code and a data descriptor that specifies an internal character code in a data processing method that converts an external character code once into an internal character code and then processes the data. A character code conversion table that converts data into an external character code specified by This data processing device is equipped with an arithmetic control means that performs predetermined processing after converting the data into the data.

The figure shows a block diagram of an embodiment using the present invention, and shows a case where data is accessed by specifying a data descriptor number in an instruction.

That is, this embodiment includes a main memory 1 for storing machine language instruction sequences, a storage device 2 for storing data descriptors, a conversion table 3 used for converting internal code into external code, and data different from internal code to external code. It consists of an execution control means 4 that executes specific instructions while converting them into codes.

The main storage device 1 is composed of a conventional IC memory, for example, and stores machine language instructions, data, etc., and the figure shows a comparison instruction as an example to which the present invention is applied.

The above comparison instruction consists of an 8-bit operation code and an 8-bit data descriptor number that specifies the data descriptor corresponding to data A and B. Make a comparison.

The storage device 2 for storing data descriptors is composed of a conventional C memory, for example, and as shown in the figure, the data descriptor of this embodiment has a 4-bit data type field, a 4-bit code set designation field, and an 8-bit code set designation field. It has a length of 32 bits, consisting of a data length designation part and a 16-bit address designation part.

The data descriptor is specified by an 8-bit data descriptor number in the instruction, and is retrieved from the storage device 2 using this number as an address. The data type section indicates the type of data, and defines one of, for example, character data, binary data, decimal data, etc.

The code set specification section indicates the type of code set on the external medium of the data, such as JIS code, EBCD
One of the IC code, ASCII code, BCD code, etc. is defined.

The data length specification section indicates the length of the data, and the address specification section indicates the location where the data is placed in the main memory device 1.

In this embodiment, data A and B are both character data, and the external code is a JIS code.

The conversion table 3 is composed of a conventional IC memory having a capacity of 256 words and 8 bits per word, and one for each internal code and one for an external code different from the other.

In a normal computer, one character consists of 8 bits, so when an 8-bit internal code is accessed as an address, each of the 256 8-bit words mentioned above becomes the external code corresponding to that internal code. The bit pattern is formed so that Conversion table 3 in this embodiment defines rules for converting internal codes into JIS codes. The control means 4 of Jitsukiura 1 is an ordinary data processing unit controlled by a microprogram consisting of registers, adders/subtractors, microprogram memory, etc. It reads machine language instructions from the main memory 1 by a series of microinstructions, and executes the instructions. A data descriptor to be specified is retrieved from the storage device 2, data is retrieved from the main memory device 1 according to the read descriptor, and the processing specified by the instruction is executed using the data.

When, for example, the above-mentioned comparison instruction is encountered during instruction execution, the code set specification sections in the data descriptors of data A and B are checked.

Code set (internal code) of the processing computer itself
Since these are defined by hardware incorporation or settings by internal registers, it is determined whether the data A and B are different from the internal code by comparing them with the code set designation section in the data descriptor. If the code is different from the internal code, the data consisting of a string of 8-bit characters is converted to the external code via the conversion table, and then a predetermined comparison operation is performed. Therefore, in the above example, data A
, B are JIS codes, the data currently expressed in the internal code is returned to the JIS code using the conversion table 3, and then normal character string comparison is performed. As is clear from the description of the present invention using the above embodiments, a data processing device using the present invention efficiently processes data of an external code different from an internal code, and achieves the above object.

The above is just one embodiment of the present invention. In the figure, the data descriptor is separated from the machine language instruction, but it can also be part of the machine language instruction. In the figure, only one conversion table 2 is provided, but a plurality of conversion tables 2 may be provided if necessary. In this embodiment, whether or not an instruction requires conversion is determined by a microprogram, but means (for example, ordinary memory or registers) for defining instructions that require conversion may also be used.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention, in which 1 is a main memory for storing machine language instruction sequences, 2 is a storage device for storing data descriptors, 3 is a conversion table, and 4 is an execution control means.

Claims (1)

[Claims] 1 In a data processing method that converts an external character code to an internal character code and processes it, a data descriptor with an external character code specification section that specifies an external character code and an external character whose internal character code is specified are used. Character code conversion table to convert to code and when executing specific commands,
an execution control means for converting data of an external character code different from the internal character code specified by the data descriptor into an external character code according to the character code conversion table, and then performing a predetermined process; A data processing device characterized by being capable of converting a character code and performing the predetermined processing within an instruction.