JPH0145111B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an electronic typewriter, and more particularly to an electronic typewriter having a display device for displaying input data.

[Prior art]

2. Description of the Related Art Conventionally, there are high-end electronic typewriter devices that are equipped with high-performance document editing functions for the purpose of rapid recovery from misinputs and flexibility in editing. This type of electronic typewriter usually has a CRT
The operator is equipped with a display device such as the above, and the operator corrects and edits the document while looking at the display screen.

However, since conventional devices of this type use a display device that can display data for an entire page, it is inevitable that the device as a whole becomes larger and more expensive.

〔the purpose〕

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic typewriter that uses a small display device.

〔composition〕

Hereinafter, the content of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram schematically showing the entire system of an electronic typewriter to which the present invention is applied.
In the figure, 10 is a keyboard on which character/numeric keys, function keys, etc. are arranged.
The key input information from the keyboard is
The data is taken into the control section 30 through the interface and buffer section 20. The control unit 30 decodes the key input information (code),
If it is a function code, corresponding control is performed, and if it is a data code, the data code is written into the memory 40. The memory 40 has a storage capacity for one page of prints, for example. Of course, this is just an example, and memory 4
The capacity of 0 may be several lines of print. In parallel with this key input operation, the control section 30 reads data from the memory 40 and supplies it to the display device 60 through the CRT drive and interface section 50 for display. The control unit 30 also monitors the type of data read from the memory 40 and the data display position of the display device 60, and monitors the read data such as carriage return (CR) and line feed (LF).
When a code like this is detected, or when the data display position enters the right hand margin (RHM), the data for that one line is output to the printer 80 through the printer interface section 70, and at the same time a print start signal is output. is issued, and one line of data is automatically printed. The memory 40 is connected to the floppy disk device 100 through a floppy disk interface 90, and when tabulation of, for example, several lines to one page, which is determined by its storage capacity, is completed, the contents of the memory 40 are transferred to the floppy disk device 100.
00, and the floppy disk 100
Files stored in the memory 40 are stored as needed.
is called. Note that thick lines indicate data lines, and thin lines indicate control lines.

FIG. 2 shows details of the control section 30.

In FIG. 2, reference numeral 40 denotes a memory having a storage capacity of several lines or one page as explained in FIG. 1, and data is stored in the shaded area. The H point marked on the memory 40 is the memory address where the first data of the line to be displayed on the display device 60 is stored, the P point is the memory address where the next key input data is stored, and the Q point is the end code or floppy disk, etc. Each indicates the memory address where the first data of the data group called from is stored. 301 is an address register indicating the P point address of the memory 40;
02 is an address register indicating the Q point address, 3
03 is an address register indicating the H point address, 3
04 is a working address register during data transfer. A print buffer 305 stores one line of data to be output to the printer 80 as a printing means, and a display buffer 306 stores one line of data to be displayed on the display device 60. 307 is the left and right hand margin position, tab set position, hot zone, blinking data display position (not used here),
A group of format registers that specify the cursor position, margin mask position, line tail position, etc.
The bit position of each register corresponds one-to-one to the character position of display buffer 306. In this format register group 307, each of the above positions is specified by setting the corresponding bit to logic "1". An address pointer 308 indicates the working address of the display buffer 306 and format register group 307.

309 is an LHM address register that stores the address of the left hand margin (LHM); 31
0 when transferring data to the display device 60;
Space code (SP) entering the hot zone
This is an SP address register that stores an address on the memory 40 of. Reference numeral 311 indicates an RHM address register that stores the address of the right hand margin (RHM). 312 is a data discrimination/control logic circuit that discriminates the type of data transferred from the memory 40 to the display buffer 306 and outputs various control signals. 313 to 316 are state flip-flops that are set by the output control signal of the data discrimination/control logic circuit 312; The second specific data, hyphen (-), 315 indicates the carriage return (CR), which is the first specific data, and 316 indicates the presence or absence of the line feed (LF).
In particular, the flip-flop 315 functions as a first detection means for detecting that a carriage return as the first specific data has been input. Furthermore, the flip-flop 314 functions as a second detection means for detecting that a hyphen, which is second specific data, is input into a hot zone, which is a specific area in one line. A status flip-flop 317 indicates whether the cursor is in the RHM, and a status flip-flop 318 indicates whether data transferred to the display buffer 306 remains in a predetermined area of the memory 40.

319 changes the contents of address register 301 by ±1
319' is the address register 302
320 is an arithmetic unit that increments the contents of the address register 304 by 1; 321 is a comparison circuit that compares the contents of the address registers 301 and 304; 322 is the contents of the working address register 304 and the space address register 310. 323 is a comparison circuit that compares the contents of the address pointer 308 and the RHM address register 311.

324 is a hyphen-on detection circuit that detects a hyphen-on code in data transferred to the print buffer 305; 325 is a multiplexer that switches and outputs data from the memory 40 or a CR code from the outside. 326 detects the CR code and LF code from the output data of the multiplexer 325,
Similarly, 327 is a print end instruction circuit that detects the CR code and LF code from the output data of the print buffer 305 and issues a print end signal. 328 is a print buffer 305 according to instructions of a print start signal and a print end signal.
A printer output control circuit that controls data transfer between the printer 80 and the printer 80 is shown. Reference numeral 329 is an input code determination control circuit that determines the key input code and divides it into data and function code, transfers the data to the memory 40, and outputs the function code to a desired location of the device as a control signal.

3 and 4 show flowcharts for explaining the operation of FIG. 2. Now, assume that the memory 40 contains data in the shaded area as an initial state. As previously explained, the address register 301 stores the P point address of the memory 40, similarly, the address register 302 stores the Q point address, and the address register 303 stores the H point address. At this time, the contents of the memory 40 starting from the H point address are stored in the display buffer 306, which is taken into the display device 60 together with each piece of information in the format register group 307, and displayed on its display screen. ing. Figure 8A shows an example of a format display, where ○A represents the left hand margin, ○B represents the right hand margin, ○C represents the tab set position, ○D represents the range of the hot zone, and ○E represents the cursor. There is.

Now, when a new input is made from the keyboard 10 and the key input code is determined to be data by the input code determination control circuit 329, the data is stored in the memory 4 determined by the address register 301.
It is written to the P point address of 0. Thereafter, the address register 301 is incremented by 1 by the arithmetic unit 319.

Along with this key input operation, the display buffer 306 is rewritten. In this case, first, data transfer preparation processing is executed as follows. That is, the H point address of the address register 303 is the working address register 304.
The contents of the display buffer 306 are cleared. At the same time, the contents of LHM address register 309 are set to address pointer 308. After that, the LF display flip-flop 31
6 is checked, and if it has been reset, registers 4-7 of format register group 307 are cleared and flip-flop 313 is cleared.
~318 are reset. On the other hand, if the LF display flip-flop 316 is set,
Under the control of the data discrimination/control logic circuit 312, the address pointer 308 is incremented until "1" is detected in the line tail register 7 of the register group 307, and the address pointer 308 is aligned by line feed. Thereafter, registers 4 to 7 of the format register group 307 are cleared, and the flip-flop 31
3 to 318 are reset. This completes the data transfer preparation process, and the content of the address in the memory 40 specified by the working address register 304 (i.e., the content of the H point address) is read out and passed through the gate G ₁₂ (normal gate G ₁₂ is in the on state) address pointer 30
The data is written to the address of the display buffer 306 designated by 8.

From this memory 40 to the display buffer 30
In parallel with the data transfer to 6, the transferred data is discriminated by the data discrimination/control logic circuit 312,
The following processing is performed depending on the type. That is, if the data is character, numeric, or symbol data, the address pointer 308 is incremented by 1 to prepare for the next data transfer. For space code,
Only when the hot zone is entered, the state flip-flop 313 is set, and the contents of the working address register 304 at that time are transferred to the space address register 310. Address pointer 308 is +1 regardless of whether it is inside or outside the hot zone.
be done. In the case of a hyphen code, the status flip-flop 314 is set only when the hot zone is entered. As with the space code, the address pointer 308 is incremented by 1 regardless of whether it is inside or outside the hot zone. In the case of a carriage return code, the status flip-flop 15 is set regardless of whether it is inside or outside the hot zone. Further, in this case, the address pointer 308 is not incremented. For line feed codes, state flip-flop 316
At the same time, the format register group 3 specified by the address pointer 308 at that time is set.
The bit of register 7 in 07 is set to "1".
Address pointer 308 is not incremented. The other codes are similarly processed in a predetermined manner. Status flip-flop 317 connects address pointer 308 and RHM address register 31 when the margin release key is not pressed.
The contents of 1 are compared by the comparison circuit 323, and if they match, it is set. On the other hand, when the margin release key is pressed, the setting operation of the flip-flop 317 in this state is prohibited, although it is omitted in FIG.
Set only when a space code is detected. FIGS. 5 and 6 show these processes in a table.

The hot zone area can be detected by accessing the hot zone designation register 3 in the format register group 307 with the address pointer 308 and checking whether the designated bit is set to "1". The read signal from the hot zone designation register is individually ANDed with the discrimination signal of the data discrimination/control logic circuit 312, and becomes the set input of the state flip-flops 313, 314 and the data latch signal of the space address register 310, respectively.

As described above, one piece of data is transferred from the memory 40 to the display buffer 306, and if the data is not an end code, the working address register 304 is incremented by 1 by the arithmetic unit 320. At this time, flip-flop 313~
317 remain in the reset state, the contents of the next address in the memory 40 specified by the address register 304 are read, and this is transferred to the address pointer 308 (which has already been updated in the manner shown in FIG. 6). ) is written to the display buffer 306 address specified by . While state flip-flops 314-317 are being reset,
This data transfer is repeated, and the display buffer 306 is rewritten. During this time, the comparison circuit 321 compares the address registers 301 and 304, and if the contents of the two match, it sends out a match signal. This match signal causes the state flip-flop 3 to
18 is set. In other words, all data transfer from the area up to point P in the memory 40 to the display buffer 306 is completed before the right hand margin is reached, and the transferred data includes codes such as carriage return and line feed. If it is not included or contains a hyphen code, it means that it is outside the hot zone.

When the state flip-flop 318 is set, the Q point address in the address register 302 is moved to the working address register 304, and
Data at the Q point address is read from the memory 40. If an end code is stored at this Q-point address, when the data discrimination/control logic circuit 312 detects this end code, the data transfer operation from the memory 40 to the display buffer 306 is performed until the next key input. is not executed.
During this time, the contents of the display buffer 306 will continue to be displayed by the display device 60. This is a case where the end code is stored in the memory 40 in advance. However, if the Q point address in the memory 40 is not the end code, then until the end code is read out, or any of the flip-flops 314 to 317 is The data after the Q point address continues to be transferred to the display buffer 306 until it is set, and then it is ready for the next key input.

On the other hand, the match signal from the comparison circuit 321 is also applied to the cursor register 5 of the format register group 307, and the bit specified by the address pointer 308 at that time is set to "1". In other words, this indicates the display position of the next key input data. In this way, when the next key input is performed and it is data, the data is stored in the address of the memory 40 specified by the address register 301, and at the same time, the display buffer 306 is rewritten in the same manner as before. is executed again, and the rewritten data is transferred to the display device 60 and displayed. FIG. 8B shows an example of the display. Note that this is an example where the end code is stored at the Q point address. A display example when normal data is stored after the Q point address will be described later.

Data input from the keyboard 10 and the data rewriting operation based on this in the display buffer 306 proceed, and the flip-flops 313 to 313
316 reaches the position of the right hand margin while remaining in the reset state. In other words, this means that you have reached the right hand margin with no spaces in the hot zone. In this case, the contents of the address pointer 308 and the RHM address register 311 match, and the comparison circuit 323
A matching signal is detected from. As a result, the RHM flip-flop 317 is set, alerting the operator to the hyphenation and shutting down the system until another key entry is made. Note that the reset of the RHM flip-flop 317 is performed by the flip-flops 313 to 316 before the printout of one line, which will be described later, is executed and the next line of data is transferred from the memory 40 to the display buffer 306. This is done together with the reset.

Next, the printing operation will be explained. This is done automatically when any one of flip-flops 314-317 is set and flip-flop 318 is reset, when the apparatus switches to print mode.

First, the hyphen display flip-flop 314
The case where is set will be explained. As shown in FIG. 5, the flip-flop 314 is set when one line of key input advances to the hot zone and a hyphen is added for a line break. in this case,
Even if the input data does not reach the end of a line, the contents of that line are immediately printed out, and the display device 60 displays the key input data of the next line. Its operation is as follows. When the reset condition of flip-flop 314 is detected,
The H point address of the address register 303 is transferred to the working address register 304 again, and the contents of the address in the memory 40 indicated by the address register 304 are transferred to the print buffer 305 through the multiplexer 324. Writing to the print buffer 305 is performed at the timing of the input strobe. Note that data transfer to the display buffer 306 is prohibited in this print mode. Thereafter, the working address register 304 is incremented by 1 by the arithmetic unit 320. The contents of this working address register 304 are compared with the contents of the address register 301 by a comparator circuit 321 until the two match.
Data transfer to print buffer 305 is repeated.

When the address registers 301 and 304 match and the data transfer from the memory 40 to the print buffer 305 is completed, the hyphen on detection circuit 32
4 detects a hyphen code. Also, at this time, flip-flop 314 is in the set state. Therefore, the switching signal D is applied to the multiplexer 325. As a result, multiplexer 3
25 selects a preset carriage return code (CR code) and prints the print buffer 3.
Transfer to 05. In other words, the print buffer is 30
5, data for one line from point H to point P (point P is a point that moves each time a new key input is given) in the memory 40 is stored with a CR code added thereto. Thereafter, the contents of the working address register 304 at that time are transferred to the address register 303. That is, the new H
The point address is registered.

On the other hand, the CR code selected by the multiplexer 325 and transferred to the print buffer 305 is
Print start instruction circuit 326 which is a print instruction means
As a result, a print start signal is provided from the instruction circuit 326 to the printer output control circuit 328. When the printer output control circuit 328 receives the print start signal, it issues an output strobe signal to the print buffer 305, reads the data stored in the print buffer 305 sequentially while checking the ready signal of the printer 80, and outputs the data to the printer 80. In this way, print buffer 3
When the last data, that is, the CR code is read from 05, the CR code is output to the printer 80 and simultaneously detected by the print end instruction circuit 327, and as a result, the print end signal is sent from the instruction circuit 327 to control the printer output. is applied to circuit 328. Upon receiving this print end signal, the printer output control circuit 328 stops the output strobe to the print buffer 305, thereby completing reading data from the print buffer 305. During this time, the printer 80 is operated by the print output control circuit 328.
It sequentially prints out the given data through the printer, and when it detects a CR code, it performs a carriage return operation and prepares for the next print line.
That is, once one line of data is transferred from the memory 40 to the print buffer 305, after that,
Under the control of the print output control circuit 328, the printing operation for one line is performed independently of the display display operation. This is common to all subsequent print operations.

Next, the case where the state flip-flop 315 or 316 is set will be explained. In this case as well, the contents of the address register 303 are transferred to the working address register 304, and the contents of the address in the memory 40 indicated by the address register 304 are transferred to the print buffer 305. after that,
The address register 304 is incremented by 1 and the memory 40 is
The transfer from to the print buffer 305 is repeated in synchronization with the input strobe, and when a match occurs, the contents of the register 304 at that time are transferred to the address register 3.
Moved to 03. These operations are the same as when state flip-flop 314 is set.
The print operation is based on the CR read out from the memory 40.
The code or LF code passes through the multiplexer 325 as it is, and this is sent to the print start instruction circuit 32.
6 and a print start signal is issued to the printer output control circuit 328, thereby starting the print process.

Next, a case will be described in which state flip-flop 317 is set and flip-flop 313 is also set at this time. An example of the display at this time is shown in FIG. 8C. In other words, this is the case when the margin release key is not pressed. In this case, the data up to the space closest to the right hand margin (RHM) will be printed out, and the data after that will be newly displayed on the display device. will be done. Its operation is as follows. Once the set state of state flip-flops 313 and 317 is detected, address register 3 is set as before.
The contents of 03 are the working address register 30.
4, and the contents of the address in the memory 40 indicated by the address register 304 are transferred to the print buffer 305. After that, the working address register 304 is incremented by 1. At this time, as is clear from FIG. 4, the space address register 310 stores the address on the memory 40 of the space closest to the RHM. When the working address register 304 is incremented by 1,
The contents are compared with the contents of the space address register 310 by a comparison circuit 322, and the contents are transferred from the memory 40 to the print buffer 305 until they match.
Data transfer to is repeated. When the address registers 304 and 310 match, a match signal is output from the comparison circuit 322, and the data transfer to the space closest to the RHM is completed. At this time, the match signal E switches the multiplexer 325, and The CR code is added in the same way as if it were set. When this CR code is detected by the print start circuit 326, the print operation is started. On the other hand, working address register 3
04 is incremented by 1 by the arithmetic unit 320, and its contents are newly registered in the address register 303. Therefore, in the subsequent data transfer to the display buffer 306, the next data in the space closest to the RHM is read out, and the display buffer 306 is rewritten.

In this way, the print start instruction circuit 326
When a carriage return is input, it instructs to print the data displayed on the display device 60 regardless of its input position, and when a hyphen is input in a hot zone in one line, the input data is This automatically instructs printing of the data displayed on the display device 60 even if the end of the line has not been reached.

The above is the basic operation of an electronic typewriter with a one-line display device as an embodiment of the present invention. In this case, as is clear from the table in FIG.
Even if data such as back space, half line feed, half reverse line feed, and margin release are transferred to the display buffer 306, the address pointer 308 is not incremented by 1, so these data are replaced with the next data.
It is not displayed on the display device 60. This inconvenience is resolved as follows. In FIG. 2, gates G ₁₁ and G ₁₂ have a characteristic configuration. Here, we will explain the data display of margin release as an example.

Assume now that an already created file is called from the floppy disk and the data structure in the memory 40 at a certain point in time is as shown in FIG. 9A. (φ indicates margin release data, b indicates space data). In this case, the display on the display device will be as shown in FIG. 9B from the explanation just now. Now, if you press the character shift key on the keyboard, the contents of the Q point address register 302 will be changed to the read address according to the flowchart in FIG.
The contents of the P point address register 301 become the write address, and the data “l” of the Q ₁ point is stored in the memory 40.
is moved to point _P1 , and then the contents of both address registers 301 and 302 are incremented by +1. In other words, this means that the cursor has moved one position to the right.
It is assumed that the same operation is repeated and the data structure of the memory 40 changes as shown in FIG. 10A. FIG. 10A shows a state in which the margin release data φ is at the _Q1 point address, that is, at the cursor position. In this state, in the process of transferring data from the memory 40 to the display buffer 306, at the timing when the margin release data φ is transferred, the output of the cursor register 5 of the register group 307 is "1", and the output of the cursor register 5 of the register group 307 is similarly compared. circuit 321
Since the output of the gate _G11 is also "1", the output J of the gate G11 becomes "1", so the gate _G12 is turned on, and the margin release data φ is directly transferred to the display buffer 306. . At the timing of the next data "h", the output of the cursor register 5 is still "1" (the previous data is a margin release, and the pointer 308 is +
1), in contrast, the comparison circuit 321
Since the output of _G11 has changed to "0", the output J of G11 is "0", so the gate _G12 is turned off, and the transfer of data "h" to the display buffer 306 is prohibited. From then on, gate G ₁₂ is turned on normally. In other words, the display on the display device 60 becomes as shown in FIG. 10B, and the margin release code φ is displayed in priority to the character data h.

In other words, when margin release data φ is input between character data "t" and character data "h" and "e" is input for character data "h", margin release data The fact that φ has been input is displayed not between character data "t" and character data "h" but between character data "t" and character data "e".

FIG. 7 shows a specific example of the configuration of the data discrimination/control logic circuit 312. As mentioned above, the data discrimination/control logic circuit 312 is connected to the memory 4
It has a function of directly transferring the data read from 0 to the display buffer 306, a function of determining the transferred data, and a function of advancing the address pointer 308 based on the determination result.
Block 601 is a section that outputs input data from memory 40 as is to display buffer 306 and at the same time discriminates the data, and is comprised of a so-called decoder matrix. The space (SP), hyphen (-), carriage return (CR), and line feed (LF) discrimination outputs detected by this decoder matrix 601 serve as set inputs to the state flip-flops 313 to 316 in FIG. 2, respectively. , and the margin release determination output is input to the margin mask register 6. 6
02 is a flip-flop, 603 is a clock pulse generator, and 604 is a ±1 circuit. ±1 circuit 6
04 is connected to the address pointer 308 in FIG.
If a number or symbol is detected, the address pointer 308 is incremented by +1, and if a backspace (BSP) is detected, it is incremented by -1. Note that the strobe signal is issued every time one data transfer is performed,
The above +1 at the generation timing of the strobe signal.
Or -1 is executed. Decoder matrix 6
When a tab is detected at 01, flip-flop 6
02 is set. As a result, the clock output of the clock pulse generator 603 is applied to the ±1 circuit 604, and during this time, the address pointer 308 continues to increment. When the address pointer 308 advances and "1" is sent out from the tab register 2 of the format register group 307, the flip-flop 602 is reset, thereby stopping the sending of the clock pulse, that is, the advancing of the address pointer 308. At this time, address pointer 30
8 indicates the desired tab position. Similarly, when the state flip-flop 316 is set, the clock pulse generator 603, the ±1 circuit 60, and the
4 causes the address pointer 308 to increment, and when "1" is sent out, the increment stops. That is, this is the process of positioning the address pointer 308 using the line feed described above. When a carriage return (CR), line feed (LF), half line feed (HLF), half reverse line feed (HRLF), margin release, or end code is detected in the decoder matrix 601, ±1 circuit 604 is detected. Prohibit operation. This is easily understood from the table in FIG.

2 and 7 actually constitute a part of, for example, a microcomputer, and it goes without saying that the operation sequence of each part described so far is controlled by a program.

FIG. 3 and FIG. 4 collectively represent the operation flow.

〔effect〕

According to the present invention, an electronic device capable of automatically determining that data displayed on a display device is at the end of a line in response to input of a carriage return and specific data different from the carriage return and starting printing. Typewriter available.

Moreover, since the data displayed on the display is always printed line by line, there is no need to install a large display device with a display capacity that spans many lines, making the entire electronic typewriter smaller and cheaper. becomes possible.

Additionally, if specific data is entered in a specific area at the end of a line, printing will start even if the input data has not reached the end of the line, so there is no need to continue inputting the input data to the end of the line. , it becomes possible for the electronic typewriter to operate in a manner very close to the operator's will.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the overall configuration of an electronic typewriter to which the present invention is applied, FIG. 2 is a diagram showing an embodiment of the control section in FIG. 1, and FIGS. Flowchart to explain the operation,
5 and 6 are functional explanatory diagrams of the data discrimination/control logic circuit in FIG. 2, FIG. 7 is a diagram showing a specific configuration example of the data discrimination/control logic circuit, and FIG. 8 is a table of the display device. Figures showing examples, Figures 9 and 1
FIG. 0 is a diagram showing a memory structure and a display example. DESCRIPTION OF SYMBOLS 10... Keyboard, 30... Control unit, 40... Memory, 60... Display device, 80... Printer, 100... Floppy disk, 301-304... Memory address register, 305... Print buffer, 306... ...Display buffer, 307...Format register group, 308...Address pointer, 309
... LHM address register, 310 ... Space address register, 311 ... RHM address register, 312 ... Data discrimination/control logic circuit, 313 to 318 ... Status flip-flop,
319, 320... Arithmetic unit, 321-323...
Comparison circuit, 324...Hyphen on detection circuit, 32
5... Multiplexer, 326... Print start instruction circuit, 327... Print end instruction circuit, 3
28... Printer output control circuit, 329... Input code determination control circuit.

Claims (1)

[Claims] 1. Data input means for inputting data;
A display means for displaying data input from the data input means, and a printing means for printing the data displayed on the display means, the data input from the data input means being displayed on the display means. , an electronic typewriter in which a document is edited line by line while looking at the display surface of the display means, and the edited line of data is printed by the printing means, wherein a carriage return is input from the data input means. a first detection means for detecting that specific data different from the carriage return has been input from the data input means to a specific area provided at the end of one line; and print instruction means for instructing the printing means to print the data displayed on the display means in response to the second detection means and the first detection means;
The printing instruction means instructs printing of the data displayed on the display means when the carriage return is input, regardless of the input position thereof, and also prints the specific data in a specific area provided at the end of one line. An electronic typewriter characterized in that, when the input data is input to the display means, printing of the data displayed on the display means is instructed even if the input data does not reach the end of a line.