DD142827C2 - PROGRAM MEMORY FOR ELECTRONIC BOOKING MACHINES - Google Patents

Description

199362 -f-

Title of the invention

Program memory in electronic booking machines

Field of application of the invention

The invention is applicable to electronic accounting machines equipped with a program carrier which can be sensed in the print positions of the carriage.

Characteristic of the known technical solutions

It is known to provide the carriages of electronically operating machines with a mechanical program carrier, via which the operations to be performed within the mechanics are controlled. Otherwise, the machine works with an electronic program memory. The effort required for the use of this program memory (recording, loading and control of the program, storage capacity) is not appropriate, since the maximum operating speed of this booking engine is determined anyway by the occurring when stopping the car printing operations. (Heinrich: Mittlere Datentechnik, 1970 and 1972, p. 63).

Other known electronic accounting machines are controlled via a program rail which can be sensed in connection with the movement or in the print positions of the carriage.

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In this case, if the operations to be performed are so extensive that they can not be executed with those instructions available in a printing position and which can be removed from the program rail, it is necessary to insert stop positions of the carriage in order to accept further commands. These additional stopping positions in which no pressure occurs greatly reduce the working speed of the machine. With reference to a recording medium divided into printing columns, stop positions of the carriage in which printing processes take place are represented in FIG. 1 by crosses. The additional non-printing stopping positions of the wagon, which are only needed for further instruction takeover, are indicated by bracketed crosses (electronic booking machine BAE 309 of Pa. Olympia). The programming by means of program rail, however, has the advantage that it is clear, can be controlled without additional equipment and no means for setting the program memory is required.

Object of the invention

The object of the invention is to provide for the said booking machines a program memory, on the one hand does not counteract the utilization of the given maximum operating speed of the machine and on the other hand keeps the cost of program storage low.

Explanation of the essence of the invention

The object of the invention is the elimination of the non-pressing stop positions of the carriage by the use of suitable program memory.

The invention is characterized in that the program memory is formed from the program carrier, the mecha-

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nisch adjustable, in the print positions can be sensed and executed commands associated bit pattern carries and is connected via the sensing unit, the adapter and the common data bus to the microprocessor, and from the main memory for receiving the other between the printing positions to be executed commands.

embodiment

The invention will be explained with reference to an electronic booking machine, which is equipped with a keyboard 1, a printing unit 2, a tabulable car 3 with a platen 4- and with a detachably mounted on the carriage 3 program drum 5 (Figure 2). On the program drum 5 inserted function tabs 16 act on corresponding sensing elements 6 a sensing unit 7. The sensing unit 7, the printing unit 2 and the keyboard 1 are each an adapter 8; 9 and 10 connected to a microprocessor 11 (data bus 12). Each sensing member 6 is associated with a transducer element 20. The sensing members 6 actuate the transducer elements 20, whose output signals are provided via the adapter 8 and the Datenainmelleitung 12 for the microprocessor 11. A transducer element 20 may in this case be a reed contact, which is switched by the sensing member 6 provided with a magnet during its sensing movement in dependence on the presence of a function tab 16.

When equipped with magnets sensing members are used as transducer elements and Hall generators. Furthermore, optoelectronic components can also be used as transducer elements. The light radiation necessary for their actuation is released by the sensing movement of the sensing member as a function of an existing function tab 16.

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The control of all internal steps of the microprocessor 11 via a pest program, which is connected in a read memory 13. The read memory 13 and a random access memory 14 are connected to the microprocessor 11 via the common data bus 12. Between the microprocessor 11 and the Abfühleinheit 7, the printing unit 2 of the keyboard 1 are via the adapter 8; 9 and 10 status lines 19 and control lines 21 out. About the lines 19; 21 takes place by means of the microprocessor 11 in conjunction with the plague program of all necessary for the realization of a sequence of processing operations signal exchange. The detailed description of said electronic assemblies and the processes occurring in them is omitted, as these are sufficiently familiar to the skilled person. When choosing a microprocessor as the central processing unit, integrated semiconductor memories are used for read memory 13 and main memory 14.

The main memory 14 contains u.a. an output register 22, an input register 25, a command register 23, and a command counter 24. The remaining memory locations of the random access memory 14 are provided for the reception of operands and commands of an additional program to be explained. The program drum 5 is divided into segments (FIG. 3). A segment forms the program carrier 15 on which the instructions of the main program to be processed are stored. These commands are represented by function tabs 16 whose absence or presence is assigned the binary meaning O or L. In each printing position of the carriage 3, the function tabs 16 inserted in a direction perpendicular to the longitudinal direction of the program drum 5 are picked up by the sensing device 7 for the purpose of command transfer and execution. In Fig. 3 belonging to a printing position insertion slots 17 are shown for the Funktionsreiter 16. The bits corresponding to the function tabs 16 of the program

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19 93 62

Carrier 15 are denoted by X * ... X _n . The following is an allocation possibility of the bits X ^ '"X _n given:

Operation I)

) Command I

... Xg address I)

Operation II depending on

Address II

Program continuation (main program / additional program)

·· X _n Mechanics commands (decoding and execution of the

Commands through mechanical assemblies),

other commands (e.g., logical decisions, commas, and the like).

Apart from the operands defined by the addresses I and II, further operands are available via a manual address input and a manual operand input, which can be processed by means of the operations specified by Xv, / X ₂ and Χ _π / X ^. The buffering of the operands for print output and processing takes place via the output register 22.

Bit X ^ p indicates whether the processing of the main program (program carrier 15) is continued or whether the jump into the mentioned additional program, which is stored in the main memory 14, takes place.

The program stored mechanically on the program carrier 15 is continued as long as the scope of the operations to be carried out can be detected by the commands which can be removed in the respective printing position. The movement of the carriage and the column-by-column thereof are necessary for the execution of the printing operation, so that no additional time is required for the removal of the mechanically stored commands, which affects the working speed of the machine.

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199362

However, if the amount of operations to be performed exceeds the command capacity available in a printing position, it would be necessary to insert additional non-printing stop positions of the carriage 3 to accept further commands which would reduce the operating speed of the machine. This disadvantage is inventively avoided by storing the "non-printing" program parts as an additional program in the working memory 14 ·. The carriage then only stops at the stop positions indicated by the parenthesized crosses according to FIG. 1 during the execution of the same program. The control in the additional program is effected by the bit X, ₂ . If the jump into the additional program is provided by its value (eg X ₂ = L), the bits X ₇ to X _{1 of} the program carrier 15 act as the starting address of the additional program, the use of the operation II in conjunction with the address II is then not possible. The bit structure of the commands of the additional program is analogous to the bit structure of the main program (2 bits for operation, 4 bits for operand address, 1 bit for program continuation).

The bits of the additional program are marked with Х '^ ... ХѴ, X ¹ ^ ₂ . By ONTINUED for Programmf provided bit X'-io ^w i ^{r <i} again analogous of the mechanically stored bits X ₁₂ of the main program of the whereabouts in the auxiliary program (for example, X ¹ X i ₂ = L) or the return to the main program set (for example, X ¹ ^ ₂ = 0). If it remains in the additional program, the further counting of the command counter 24- is carried out by one unit.

The execution of the commands of the main and the additional program is controlled by. The stored in the read memory 13 Pest program. About this the commands of the program carrier 15 and the additional program are entered into the command register 23 and queried their contents. Depending on the fourth of the operation bits is jumped into the appropriate routine of the pest program and

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the internal processing steps performed with said operands.

The input of the additional program in the working memory 14 is done via the function tabs 16 of a second segment 18 of the program drum 5.

In FIG. 3, the bits X '... X ^f ₆ , X ¹ ^ ₂ corresponding to these puncture drivers 16 are shown opposite the associated insertion slots 17. To read the commands of the additional program in the main memory 14, the program drum 5 is switched so that the function tabs 16 of the segment 18 of the sensing unit 7 are opposite. The reading of the commands in the additional program then takes place, for example, in the carriage right run, wherein after each command reading the content of the command counter 24 is increased by one unit. Under the control of the fixed program located in the read memory 13, the function tabs 16 corresponding to the bits Χ, Χ, ', X'.p are sensed by the sensing unit 7 each time the carriage is stopped. Its binary content is brought via the adapter 8 in a processable form for the microprocessor system and read into the main memory 14.

By means of the following rough algorithm, the mode of action of the program memory device is summarized again:

Claims (1)

199362-- invention claim Program memory in electronic accounting machines having a microprocessor with memory, a keyboard, a printing unit, a common data bus and a booking car, which has a cooperating in the printing positions of the booking car with a sensing unit mechanically adjustable program carrier over which controls the mechanical punctures of the machine directly are formed, characterized in that the program memory is formed from the program carrier (15), the mechanically adjustable, carries in the print positions be detected and executed commands associated bit pattern and via the sensing unit (7), the adapter (8) and via the common data bus ( 12) is connected to the microprocessor (11), and from the working memory (14) for receiving the v / eitern between the printing positions to be executed commands. Dazu_.j $ L $ eiten drawings