JPH0383136A - Electronic computer - Google Patents

Abstract

PURPOSE:To designate numerical operation more flexibly by selecting whether a numerical operation processor connected to a receptacle is used to execute numerical operation or the numerical operation processor is not used to execute numerical operation. CONSTITUTION:A central control processor 13, a receptacle 13 for the numerical operation processor, a means 16 which checks whether the numerical operation processor is connected to the receptacle 13, a means 17 which designates whether the numerical operation processor is used or not, and a means 18 which selects whether the numerical operation processor is used or not used to execute the numerical operation are provided. By selection, the numerical operation processor is used to execute the numerical operation or the numerical operation processor is not used to execute the numerical operation. Thus, it is designated whether the numerical operation processor is used or not without previously confirming whether the numerical operation processor is connected or not.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electronic computer using a numerical processor, and more particularly to an electronic computer in which the numerical processor is mounted on an obscene computer.

[Prior Art] Conventionally, a 2M type method has been used to determine whether or not to use a numerical processor.

The first method is a method that uses the functions of the numeric processor itself. When executing numeric calculations, it is determined whether or not the numeric processor is connected, and whether or not the numeric processor is used to perform the calculation is determined. This method determined whether to perform calculations without using an arithmetic processor.

The second method is to prepare a flag or switch that can be set in advance by the user, and to set whether or not to use the numerical calculation processor in advance. This method determined whether or not to use a numerical processor depending on the state.

[Issue to be Solved by the Invention 111 However, among these conventional methods, the first method always uses a numerical arithmetic processor if it is connected; The drawback was that the results could not be obtained. Also,
The second method has a fatal flaw in that if the user sets a flag to use the numeric processor when the numeric processor is not connected, there is no guarantee regarding the operation when performing numeric operations. there was.

An object of the present invention is to provide an electronic computer that uses a combination of these two methods to more flexibly specify whether or not to use a numerical processor.

[Means for Solving the Problems] The electronic computer of the present invention includes at least one central control processing unit! (CPU), a socket for a numerical arithmetic processor, means for checking whether a numerical arithmetic processor is connected to the socket for the numerical arithmetic processor, and means for specifying whether or not to use the numerical arithmetic processor. ,
means for discriminating whether or not to perform numerical calculation using a numerical calculation processor; means for performing numerical calculation using the numerical calculation processor connected to the socket for the numerical calculation processor; The present invention is characterized by having means for performing numerical operations without using an arithmetic processor, and means for selecting and executing one of these two types of numerical operations.

[Operation] According to the above configuration of the present invention, it is now possible to specify whether or not to use a numerical arithmetic processor without determining in advance whether or not a numerical arithmetic processor is connected.

[Example code] Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a block diagram schematically showing an electronic computer according to the present invention. Engineering I uses keyboards and CRTs.

It is an input/output device such as a printer. 12 is the central control processing bag! t (CPU). Reference numeral 13 denotes a socket for a numerical arithmetic processor, and when the numerical arithmetic processor is connected to this socket, it can perform high-speed numerical arithmetic by operating in conjunction with the CPUI 2. Engineering 4
is the main memory and holds the following means. 15
is a numerical calculation processor use flag, which is used to set whether or not to use the numerical calculation processor. 16
is a means of checking whether a numerical calculation processor is connected or not. 17 is means for specifying whether or not to use a numerical calculation processor. Reference numeral 18 denotes means for discriminating whether or not to execute using the numerical arithmetic processor connected to the socket 3 for the numerical arithmetic processor. The three means 169, 171, and 18 are all stored as programs in a part of the main storage device and executed by the CPU 12. When an electronic computer system has a numerical processor connected to the socket 13 for the numerical processor, it is important to determine whether or not to use the numerical processor to increase the operating speed of the system. If there is a numerical calculation processor connected to the socket 13 for the numerical calculation processor, it is better to use the numerical calculation processor for faster numerical calculations, for example.
Can perform floating point operations. On the other hand, if a numerical processor is not connected to the socket 13 for the numerical processor and a program using the numerical processor is executed, the result will not be guaranteed. There is a need to emulate arithmetic functions, for example the floating point operations mentioned above.

FIG. 2 is a diagram illustrating an example in which Intel's 80286 is used as the CPU and Intel's 80287NPX is used as the numerical calculation processor. FIG. 3 is a diagram showing a flowchart of a method for distributing whether or not the data is rejected. Reference numeral 21 corresponds to the means 17 for specifying whether or not to use the numerical arithmetic processor shown in FIG.
6, and 21.24 corresponds to the means 18 for discriminating whether or not to execute using the numerical arithmetic processor connected to the numerical arithmetic processor socket 3 in FIG. 21 is a determination as to whether or not to use a numerical calculation processor. In this embodiment, a numerical calculation processor use flag is provided on the main storage device 14, and it is determined whether or not to use the numerical calculation processor based on the value. In the numerical calculation processor usage flag, whether or not to use the numerical calculation processor is set in advance by a program or a flag. Of course, the settings may be made using other methods. 22
is an initialization instruction (FNINIT) for the numerical arithmetic processor in the 80287NPX, and is ignored if no numerical arithmetic processor is connected. 23 is an instruction (FST
SW). 24 is a determination of the state of the lower byte of the status, and as a result, it is possible to determine whether or not a numerical arithmetic processor is connected. 25 is a calculation process using a numerical calculation processor. 26 is a process of calculating without using a numerical calculation processor.

When it is determined to use the numerical arithmetic processor based on the determination 21 of the state of the numerical arithmetic processor usage flag,
Furthermore, it is determined whether a numerical calculation processor is connected. Usually, a numerical arithmetic processor is provided with a mechanism for determining whether or not it is connected. 8
In 0287NPX, after executing the FNINIT instruction, F
This can be determined by executing the STSW instruction and checking the state of the lower byte of the status. That is, if the lower byte of the status is 0, it is determined that the numerical calculation processor is connected, and if the lower byte of the status is 1, it is determined that the numerical calculation processor is not connected. If it is determined that a numerical calculation processor is connected, process 2 to perform calculations using the numerical calculation processor.
Execute step 5. If it is determined that the numerical arithmetic processor is not connected, or if the numerical arithmetic processor use flag is set to not be used as determined in step 21, the arithmetic processor is not used. Process 26 is executed. When assigned to processing 26 that performs calculations without using a numerical calculation processor, the calculations are executed by the CPU 12.

Figures 3(a) and 3(b) are both conventionally used.
A method for determining whether to use a numerical processor is shown.

FIG. 3(a) is an example of the first method of the conventional type 211 methods, which is a method in which which arithmetic processing is to be performed is determined depending on whether or not a numerical arithmetic processor is connected. 31 is a process of determining whether or not a numerical arithmetic processor is connected by a method that utilizes the functions of the numerical arithmetic processor itself. Actually, 22. shown in FIG. 2 of the present invention.
23. 24 processes are executed. When it is determined in the determination 31 whether or not a numerical arithmetic processor is connected that a numerical arithmetic processor is connected, a process 32 of calculating using the numerical arithmetic processor is executed. Conversely, if it is determined by the determination 3I whether or not a numerical arithmetic processor is connected that a numerical arithmetic processor is not connected, a process 33 for calculating without using a numerical arithmetic processor is executed.

FIG. 3(b) is an example of the second method among the conventional methods, in which a flag is set in advance to indicate whether or not a numerical arithmetic processor is to be used.

34 is a process for determining whether or not to use a numerical arithmetic processor based on the state of the numerical arithmetic processor usage flag, and corresponds to determination 21 in the embodiment of the present invention. The numerical calculation processor use flag is set in advance to determine whether or not to use the numerical calculation processor. When it is determined in the process 34 for determining the state of the numerical arithmetic processor use flag that the numerical arithmetic processor is to be used, a process 35 for performing calculations using the numerical arithmetic processor is executed. Conversely, processing 34 for determining the state of the numerical calculation processor use flag
If you decide not to use the math processor,
A process 36 for calculating without using a numerical calculation processor is executed.

[Effects of the Invention] As described above, according to the present invention, the user can specify in advance whether or not to use the numerical calculation processor. Additionally, even if the user has set the numeric processor to use, the numeric processor will be used if the numeric processor is not connected by determining whether or not the numeric processor is actually connected. Instead, for example, the CPU emulates the computation and has the effect that the computation result can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically showing an electronic computer according to the present invention. FIG. 2 is a flowchart showing a method for determining whether or not to use a numerical calculation processor when performing numerical calculations according to the present invention. FIGS. 3(a) and 3(b) are flowcharts showing a method for determining whether or not to perform calculations using a conventional numerical calculation processor. 11... Input/output device 12... CPU 13... Socket 14 for numerical calculation processor...
Main storage unit 5... Numerical calculation processor usage flag 16... Means for checking whether or not a numerical calculation processor is connected F... Means for specifying whether or not to use a numerical calculation processor 18... Numerical calculation Means for distributing whether or not to execute using the numerical arithmetic processor connected to the processor socket 21... Judgment of the state of the numerical arithmetic processor usage flag 22... Initialization instruction for the numerical arithmetic processor 23.・・・
Instruction 24 for checking the status indicating the state of 22... Determination of the state of the lower byte of the status 25... Processing to perform calculations using a numerical calculation processor 26... Calculation without using a numerical calculation processor Process 31...Determination of whether or not a numerical calculation processor is connected

Claims (1)

[Claims] At least one central control processing unit (CPU), a socket for a numerical processor, means for checking whether a numerical processor is connected to the socket for a numerical processor, and a numerical processor. A device having means for specifying whether or not to perform the execution, and means for discriminating whether or not to execute using the numerical arithmetic processor, the apparatus comprising: An electronic computer characterized by having means for performing numerical operations, means for performing numerical operations without using a numerical operation processor, and means for selecting and executing one of these two types of numerical operations. .