JPS6350736B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention provides for a data processing system equipped with a plurality of external storage devices capable of storing programs, such as a floppy disk device or a cassette device, to automatically perform IPL (initial program loading) at the start of operation. The present invention relates to a control method for facilitating selection of an external storage device. [Technical background] Generally, in data processing systems such as banking machines that process routine tasks,
The system uses a system that automatically selects an IPL device and executes IPL when the power is turned on at the start of operation.
FIG. 1 shows an overview of the system, where ``IPL'' routine is activated by power-on (ON), ``IPL device designation'' is specified, and ``IPL execution'' is executed. Conventionally, the following methods are often used to select an IPL device. a. Set in advance on the selection switch provided on the console or maintenance panel. b The operator inputs commands from the keyboard, etc., and registers them in the table. In any of the above cases, the physical address of the IPL device is required to specify the IPL device, so you must always be aware of the physical address as shown in the flowchart in Figure 2a, or else As shown in b, specify the IPL device number, name, etc.
It is necessary to use a method to convert it into a physical address internally. However, in the former case, if one of the current IPL devices, such as a floppy disk device, fails and the IPL device must be changed to another floppy disk device, the physical address This may be difficult for some users as it requires configuration changes and requires a certain level of specialized knowledge from the operator. Since the correspondence is fixed by the program,
There were problems such as lack of expandability when adding equipment, and the need for input keyboards and the like. [Objective and Structure of the Invention] The object of the present invention is to enable easy execution without using a physical address for specifying an IPL device, and without requiring specialized knowledge to change the specification, and to improve scalability. The object of the present invention is to provide an effective IPL selection control means. Therefore, the present invention achieves the above object by simplifying and specifying an IPL device by an offset amount or a relative address with respect to a certain standard physical address, thereby making it possible to handle the IPL device using an easy-to-understand number based on the device number. , it is also easy to convert to a physical address, and it is easy to change and expand. The configuration of the present invention based on this is, in a data processing system equipped with a plurality of external storage devices capable of storing programs, a means for setting a common reference physical address for the plurality of external storage devices; A selection switch for designating any one of the above as the IPL device, and a link between the predetermined physical address of each external storage device corresponding to the selected position of this selection switch and the reference physical address set above. It is provided with table means for holding the difference offset amount and referred to by the output of the selection switch, and an adder for adding the offset amount read from the table means and the reference physical address set above. The feature is that the addition result output from the adder is used as the physical address of the IPL device to execute IPL. [Examples of the Invention] The details of the present invention will be described below with reference to Examples. According to the present invention, selection of an IPL device is performed by a combination of a reference physical address and a device number. For example, only one reference physical address is commonly set for a group of external storage devices. The following table shows an example of the configuration of an external storage device, and the case where an IPL device is specified for this will be explained.

〔Effect of the invention〕

The knob position of the IPL device setting switch can be displayed by device type and number such as FPD #0 or DSK #3 as shown in the figure, so the operator can
The correspondence with the actual device can be easily recognized, and the settings can be easily changed. Furthermore, in the case of system expansion, this can be easily handled by preparing a spare position in the switch 1 in advance and assigning that position to the added device.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of IPL processing, Figures 2a and b are flowcharts of examples of conventional IPL device selection control methods, Figure 3 is a flowchart of an embodiment of the method of the present invention, and Figure 4 is 1 FIG. 1 is a system configuration diagram of an example device. In the figure, 1 is an IPL device selection switch, 2 is a relative address table, 3 is a reference physical address setting switch, 4 is a reference physical address register, 5 is an adder, and 6 is an IPL device address register.

Claims (1)

[Claims] 1. In a data processing system equipped with a plurality of external storage devices capable of storing programs, a means for setting a common reference physical address for the plurality of external storage devices, and an IPL of any one of the plurality of external storage devices. A selection switch for designating the external storage device as a device, and the amount of offset of the difference between the predetermined physical address of each external storage device corresponding to the selected position of this selection switch and the set reference physical address are held. , a table means that is referred to by the output of the selection switch, and an adder that adds the offset amount read from the table means and the reference physical address set above, and the addition output from the adder. IPL the results
An IPL device selection control method characterized by using the physical address of the device to execute IPL.