JPS6190232A - Printer control method - Google Patents

Abstract

PURPOSE:To reduce the overhead against a CPU by providing a means to add two shift codes unconditionally to user record and thereby making a line control of a printer. CONSTITUTION:When generating printing records, two shift codes are unconditionally added to a shift code adding part 28 without checking whether a printing data 212 of user record stored in a record buffer 21 is ending with a 1-byte code system or a 2-byte code system. A line control order is added line control of the printer is simplified, and overhead of the CPU is reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a system for controlling a printer connected to a data processing device that is capable of printing a 2-byte code system and a byte code system, such as a Japanese serial printer. Regarding.

For serial printers that can output Japanese, -i
Alphanumeric characters are represented by 1-byte codes, and 1 Japanese character is represented by 2-byte codes, and the switching between them is done using a special code called a shift code.

Figure 3 shows the correspondence between the output format ■ and the internal representation ■ of the serial printer, and (a) shows the EBCDI
1-byte code system based on C code, (b) shows 2-byte code system, and (c) shows 2-byte code system from 1-byte code system.
An example of the shift code for switching to the byte code system is shown, and (d) shows an example of the shift code for switching from the 2-byte code system to the 1-byte code system.

Further, the position of the shift code may be anywhere in a 1-byte code system, but in a 2-byte code system, it is only valid if it is in the 1st byte.

In the internal representation example shown in FIG. 4, ■ is an example in which a shift code of °29° is placed in the 2nd byte in a 2-byte code system, but in this case, the code in the 1st byte and The shift code is ignored and treated as a 2-byte code, and the printer side recognizes it as a "blank", so the shift code is ignored.

■ in the figure is an example in which the shift code is placed in the first byte in a 2-byte code system, and is recognized as a regular shift code.

Similar to the above shift code, the printer control code (control order) is not valid unless it is placed in the first byte in the 2-byte code system. When using a 2-byte code system, it is necessary to add it to the first byte.

In this way, in serial printers that can output Japanese, 1-byte code alphanumeric characters and 1-byte code alphanumeric characters.

Since Japanese and 2-byte code systems are mixed, a shift code to distinguish between the two code systems and a control order to control the printer, such as a carriage return (C
R), new line (NL), etc., the process of determining the position to place is complicated, and an effective processing method has been awaited.

[Conventional technology]

Figure 5 is a block diagram showing an example of the configuration of a data processing device connected to a Japanese serial printer, where 1 is the central processing unit (CPU) and 2 is the main storage unit (MSU).
, 3 is a memory access control unit (M to C), 41.4
2~ are input/output control devices, 41 is a file adapter (F
A), 42 is a printer adapter (PA), 51 is a file memory (FM), and 52 is a Japanese serial printer (JSP). .

Now, when the power is turned on to this data processing device, the operating system (OS) is stored from the file memory 51.
In addition to 2a and various user programs 2b, an input/output processing program 2c and the like are initially loaded into the main storage unit (MSU) 2.

When the initial program loading is completed, the main memory (MStl) is loaded in the central processing unit (CPtl).
) 2, first the operating system (O5) 2
a is read and the operating system (OS)
2a, each user program 2b is executed in a multitask format, and as one of the execution results, for example, data to be printed out is stored in the file memory (Fl'l) 51 in units of records. The above user program 2b is stored in the provided spool file 511.
At the same time, the print control block is stored in the print queue J2d on the main storage device 01SU)2.

In the central processing unit (CPU) l, the input/output processing program 2c executes printout processing in the order shown in FIG.

That is, the record retrieval processing unit 20 retrieves the record corresponding to the print control block retrieved from the print queue J2d from the spool file 511 and sets it in the record buffer 21.

In the control character conversion unit 22, the record buffer 2
The control character 211 representing line feed information at the beginning of the record set to 1 is checked, converted into a printer control order, and sent to the output cover sofa control section 23.

The print record search section 24 reads the print data 212 from the record buffer 21 and sequentially searches from the beginning of the record to determine whether the end of the record is a 2-byte code system or a 1-byte code system. (Step 2
(see step 241) If the code is a 2-byte code system (see step 242), and the last code ends with 1 byte (step 2
43), discard the 1 byte or add 1 more byte.
Byte is added to the printer control order (P),
Operates to add to the end of the record. (See step 244) The above operation is schematically shown in FIG. 7, where ① indicates a record prepared by the user, which is a 2-byte code system and the last code ends with 1 byte. represents.

■ For such a record, discard the last 1 byte code and change the printer control order (1') to 2.
An example is shown in which it is added to the first byte of a bytecode system.

The next code "29" of the printer control order (P) is a shift code for returning to the alphanumeric system.

In the example of (2), a special code "40" is added to the last 1-byte code above to create a 2-note N-byte code system (however, "
This shows the case where a printer control order (P") is added after the data is treated as "blank").

The next code of the printer control order (P), °29, is a shift code for returning to the alphanumeric system.

The record thus generated is the searched record 25 in FIG. 6, and is sent to the output control section 23. In the searched record 25,
The shaded area 251 is the boundary adjustment byte added in the above-mentioned steps ① and ②.

In the output sofa control unit 23, the control order generated by performing each input/output process shown in 22.24 above on each record 21 sequentially retrieved from the input pool file 511, and the searched record 25
is accumulated in the output cover sofa 26 until it reaches a certain amount, and when it reaches a certain amount, it is sent to the printer output unit 27.

The printer output unit 27 functions to control a printer mechanism (not shown) to perform desired printing.

[Problem that the invention seeks to solve]

In the above conventional method, as explained as the operation of the print record search unit 24, in order to generate the searched record 25 that can be properly printed from the record created by each user, it searches from the beginning of the record, It is necessary to recognize whether the end of the record is a 2-byte code or a 1-byte code, and the central processing unit (CPU)
1, there was a problem that resulted in a large overhead.

In view of the above conventional drawbacks, the present invention provides a method for generating a record for printing without checking whether a record created by a user ends with a 2-byte code system or a 1-byte code system. The purpose is to

[Means for solving problems]

The purpose of this is to provide a means to unconditionally add two shift codes to a user record, regardless of whether the user record ends with a 2-byte code system or a 1-byte code system, and to This is achieved by the printer control method of the present invention that performs line control.

[Effect]

That is, according to the present invention, when extracting each user record stored in a spool file and generating a print record, it is necessary to determine whether the user record ends in a 2-byte code system or a 1-byte code system. The printer automatically adds two shift codes to the end of the record and then attaches a line control order without checking whether the record is correct or not. This simplifies the printer's line control and reduces the burden on the central processing unit. This has the effect of reducing overflow and knots for (CPLI).

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram schematically showing the operation when performing printer processing by implementing the present invention. The same symbols as in FIG. By any necessary means, 25' is the print data generated by the present invention.

As is clear from this figure (the processing for the control character 211 at the head of the user record taken out to the record buffer 21 and the processing after the conversion control unit 23 are as follows)
Since it is the same as the conventional method, the explanation will be omitted, and here, the explanation will be limited to the processing for the print data 212 of the record.

FIG. 2 schematically shows the operation of the shift code adding section 28, and the print data generation method according to the present invention will be explained with reference to FIG. 1.

In the present invention, as shown in FIG. 1, the print data 212 of the user record stored in the record buffer 21 either ends in a 2-byte code system or ends in a 1-byte code system. The above shift code adding section 2 unconditionally adds two shift codes without checking whether the
There is a point where you add 8.

2 in FIG. 2 schematically shows the process, in which two shift codes 0.29' are added to the user record, and then a printer control order (P) is added.

Therefore, if the user code ends with a 1-byte code, the two shift codes are valid, but
Since this is an instruction to shift from a 1-byte code system to a 1-byte code system, it is practically the same as no operation.

■ indicates a case where the user record is a 2-byte code system and the end of the record ends with a 1-byte code, and the first shift code is treated as a 2-byte code along with the 1-byte code mentioned above. "blank" operation occurs, and the next shift code becomes valid, instructing a shift from the 2-byte code system to the 1-byte code system, and 1
The printer control order (P), which is a pie I code system, is enabled.

[Phase] indicates a case where the user record is a 2-byte code system and the end of the record also correctly ends with a 2-byte code. In this case, the first shift code is valid and the 2-byte code is Since it instructs a shift 1- from the system to the 1-byte code system, the next shift code instructs the shift from the 1-byte code system to the 1-byte code system,
As in (2), there is virtually no operation, so the printer control order (P) placed next is eventually activated.

As described above, it can be seen that according to the present invention, in any case, the printer control order (P) after boundary adjustment becomes valid, and immediately after that, the printer control order (P) becomes a 1-byte code system. Of the print data shown at 25 in FIG. 1, the shaded area is the boundary adjustment code.

〔Effect of the invention〕

As described above in detail, the printer control method of the present invention extracts each user record stored in a spool file and generates a print record.
Do not check whether the user record ends with a 2-byte code or a 1-byte code (
, the line control order is added unconditionally after adding two shift codes to the end of the record, which simplifies printer line control and reduces overhead for the central processing unit (CPU). It has the effect of reducing

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing the operation when performing printout processing according to the present invention. FIG. 2 is a diagram schematically showing an example of print data generated by adding two shift codes according to the present invention. FIG. 3 is a diagram showing the correspondence between the output format of a serial printer and its internal representation. FIG. 4 is a diagram illustrating the effect of placing a shift code in a 2-byte code system. FIG. 5 is a block diagram showing, for example, a configuration example of a Japanese serial printer. FIG. 6 is a diagram schematically showing the operation when performing printout processing using a conventional method. FIG. 7 is a diagram schematically showing a user record boundary adjustment operation according to the conventional method. In the drawing, 1 is the central processing unit (CPU), 2 is the main memory (MSL)
I). 3 is a memory access control unit (MAC). 41 is a file adapter 42 is a printer adapter (1'A). 51 is a file memory (FM). 52 is a Japanese serial printer (JSP). 2a is the operating system (OS). 2b is a user program. 2c is an input/output processing program. 20 is a record retrieval processing unit. 22 is a control character conversion unit, and 23 is a control unit 12.
4 is a print record search section. 27 is a printer output section, and 28 is a shift code adding section. 511 is a spool file. are shown respectively. 3? ', 1 day sheep 2 mouths ■ Ro = Ko = Ko mouth + mouth mouth ■ Figure - 11 Rororo O Roo Rororo Kaya 3 figures ■ ABeD12 0 Ho Hiroshi t ■01cz C3C4FI F20C6FCCBDCB
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Claims (1)

[Claims] In a data processing device connected to a printer capable of printing 2-byte code type and 1-byte code type, the operating system (OS) of the data processing device manages the printer and prints the records output by the user program. A control method for outputting to a printer, which unconditionally adds two shift codes to the user record, regardless of whether the user record ends with a 2-byte code system or a 1-byte code system. 1. A printer control method, characterized in that a means for controlling the printer is provided to perform line control of the printer.