JPH0573260A - Access changeover method - Google Patents

Abstract

PURPOSE:To simply switch the access system in an arbitrary timing without using special commands and switches by detecting the presence or absence of the cable connection connecting an arithmetic device and a monitor and changing the routine of the access according to the result. CONSTITUTION:The command to be accessed to inside the arithmetic device 1 or an external peripheral device 7 is inputted from an input device 3. In this case, the state is detected through the status input as a cable 6 is connected. By the judgement of this cable connection, an address is displayed and the result of the access is displayed on a display device 2. Then extracting a connector 5 of the cable 6 connecting the arithmetic device 1 and a monitor 4, the state is detected through the status input, shifted to the access to perform the completion check. In short, the access system can be easily switched in an arbitrary timing by extracting and inserting the connector 5 of the cable 6 which connects the arithmetic device 1 and the monitor 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an access switching method for displaying on a monitor.

[0002]

2. Description of the Related Art As shown in FIG. 2, in order to confirm the result of accessing the internal memory of the arithmetic unit 1 and the peripheral unit 7, the method of displaying on the display unit 2 of the monitor unit 4 and the address being accessed. , The signal state of the data bus arithmetic unit 1
There is a method of directly monitoring with a synchroscope (not shown) from a signal line connecting the peripheral device 7 with the peripheral device 7. However, in order to display the access result on the monitor device 4, first, the address to be accessed is first displayed, then the actual access is performed, and the result is displayed, which requires time for processing. , I can't capture the waveform with the synchroscope. Therefore, in order to monitor the status of the bus being accessed by the synchroscope, high-speed access that does not output the access result to the monitor is required. Therefore, when switching the access method, a method of changing a command to be input or providing a switch for instructing the command to switch has been adopted. FIG. 3 is a flow chart showing an access routine according to the conventional method. (A) is a low-speed access for displaying an access result,
(B) is high-speed access without display. The two access routines were switched by the command.

[0003]

When it is attempted to realize the access switching by the conventional method, a dedicated command or switch is required, and as many commands as the command for executing the access to be switched are required. Required,
The number of commands increases and becomes complicated. In addition, the command must be changed every time switching is performed and input from the input device 3, which complicates the operation. Furthermore, access switching must be performed after stopping the command being executed. On the other hand, reset processing is performed based on detection of the insertion / removal state of a connector, a board, etc. (Japanese Patent Laid-Open No. 56-6740
1) or a device for performing data transfer processing (Japanese Patent Laid-Open No. 58-12
036) is known, but it does not solve the problem of the present invention. An object of the present invention is to provide a method for easily switching access methods at arbitrary timing without using a dedicated command or switch.

[0004]

To achieve this object, the present invention detects whether or not a cable connecting an arithmetic unit and a monitor unit is connected, and if there is a connection, the inside of the arithmetic unit is detected. Alternatively, after displaying the address to be accessed by the external peripheral device on the monitor device, access is performed and the result is output to the monitor device for display.If there is no connection, it is displayed on the peripheral device inside or outside the arithmetic unit. It is intended to access only.

[0005]

When the cable is pulled out, the status signal for communication between the arithmetic unit and the monitor unit changes. The arithmetic unit detects this change and switches the access routine. Therefore, by connecting / disconnecting the cable, the low speed access for displaying the access result on the monitor and the high speed access for not displaying the access result are switched.

[0006]

EXAMPLES Examples of the present invention will be described below. First, in the configuration of FIG. 2, a command for accessing the peripheral device 7 inside or outside the arithmetic unit 1 is input from the input device 3. In this case, since the cable is connected, that state is detected by the status input in step 1 of FIG.
When the cable connection is determined in step 2, the address is displayed in step 3, and the result of the access in step 4 is displayed on the display device 2 in step 5. If there is a termination instruction, the command execution is terminated. Next, when the connector 5 of the cable 6 connecting the arithmetic unit 1 and the monitor unit 4 is unplugged, the state is detected by the status input in step 1 (the connector 5 is unplugged from the state that there is no response signal). The state is known), the process proceeds to the access of step 6 by the determination of step 2, and the end check of step 7 is performed. That is, the address is not displayed and the access result is not displayed. This is repeated until the end instruction is given.

[0007]

As described above, according to the present invention, the access system can be simplified by connecting / disconnecting the connector of the cable connecting the arithmetic unit and the monitor unit without providing a dedicated command or switch. Can be switched to any timing. Therefore, there is an effect that the operation confirmation time can be shortened.

[Brief description of drawings]

FIG. 1 is a diagram showing a flow chart of an embodiment of the present invention.

FIG. 2 is a block diagram of an apparatus for carrying out the present invention and conventional schemes.

FIG. 3 is a flowchart of an access routine according to a conventional method.

[Explanation of symbols]

 1 computing device 2 display device 3 input device 4 monitor device 5 connector 6 cable 7 peripheral device

Claims (1)

[Claims] 1. An arithmetic unit including a CPU and a memory, a peripheral device connected to the arithmetic unit, a monitor unit including a display unit and an input unit, and an arithmetic unit and a monitor unit via a removable connector. If the cable is connected to the device that is connected to the cable, the address to be accessed by the peripheral device inside or outside the arithmetic unit is displayed on the monitor device, then access is performed, and the result is displayed on the monitor device. An access switching method characterized by outputting to, displaying, and only accessing a peripheral device inside or outside the arithmetic unit when no connection is made.