JPS60114929A - Control method of data storage device - Google Patents

Abstract

PURPOSE:To prevent destruction in a storage device by checking whether or not a data of a storage area corresponding to transfer is stored so as to transfer data. CONSTITUTION:A corresponding transfer area of a semiconductor storage device 2 is read from a control block 1. If the inside of the device 2 is in random state, a parity bit is set and interruption is generated by an interruption signal 7 in this case. An address of the semiconductor storage device 2 in which the parity bit is set is displayed by using a display device 5 in this interruption and a parity check flag is set. After the corresponding transfer entire area is read by a main program, if the parity check flag is not set, a data is transferred to a magnetic storage device 4 via a direct memory access control block 3 from the semiconductor storage device 2. When the flag is set, a message whether it is mis-operation or not is displayed on the display device 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention uses a semiconductor storage device such as a dynamic RAM as the main storage device, and a magnetic storage device such as a magnetic tape, floppy disk, or bubble memory as the auxiliary storage device. The present invention relates to a method of controlling data storage devices such as personal computers and POS systems.

Conventional configuration and its problems A system having a semiconductor memory device and a magnetic memory device,
For example, in a stored program system, a program runs on a RAM (in a POS system, it is often necessary to store the program from a RAM, which is a semiconductor storage device, to a floppy disk, which is a magnetic storage device, etc.).

However, due to an operational error, the program existing on the 5RAM was stored in the magnetic storage device even though it was not the program that should have been stored.This was especially true immediately after the power was turned on, and the data on the RAM was completely random. However, there was a risk that the data would be stored and the previous data in the magnetic storage device would be destroyed.

Purpose of the Invention The present invention provides a method for executing transfer in response to an operational error such as transferring data in a semiconductor storage device to a magnetic storage device when the data in the semiconductor storage device is in a random state such as after power is turned on. The purpose of this is to warn the operator before the data is destroyed, thereby preventing the data in the magnetic storage device from being destroyed.

Structure of the Invention As a further structure, the present invention provides a main storage device with a semiconductor storage device such as a RAM, an auxiliary storage device with a magnetic storage device such as a magnetic tape, and which corresponds to the transfer of the semiconductor storage device. The method of controlling a data storage device transfers data from the semiconductor storage device to the magnetic storage device after checking that data in a storage area is maintained in a state worthy of transfer.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows a block diagram of an embodiment of the invention, and FIG. 2 shows a flowchart for implementing the invention.

In Figure 1, '1 is CPU (CentralP
2 is a semiconductor memory device having a high IJ bit, 3 is a DMA (Direct Memory Access)
) A control block, 4 a magnetic storage device, 5 a display device, 6 a data bus and control signals, and 7 an interrupt signal line that acts on the control block 1 when the parity bit of the semiconductor memory device 2 is set.

Next, a method for preventing operational errors in transferring data to the magnetic storage device when the data in the semiconductor storage device is in a random state will be explained in accordance with the flowchart of FIG.

The transfer applicable area of the semiconductor memory device 2 is read from the control block 1 in FIG. At this time, if the semiconductor memory device 2 is in a random state, the parity bit is set, the interrupt signal line 7 is activated, and an interrupt is generated. Using the interrupt processing program LD display device 5, the address on the semiconductor storage device 2 where the parity bit is set is displayed, and a parity check flag is also set. The main program reads the entire transfer area of the semiconductor storage device 2, and then
Whether or not an interrupt process has occurred is determined by a parity check flag, and if the flag is not set, data is transferred from the semiconductor storage device 2 to the magnetic storage device 4 via the DMA control block 3. If the flag is set, a message is displayed on the display device 6 asking the operator to judge whether or not there was an operation error. The reason why the operator is asked whether or not to transfer data even if the parity check flag is set is because there may be cases where it is only necessary to set data in a portion of the transfer area. The operator makes a decision as to whether or not to transfer data based on information about addresses with set parity bits displayed by the interrupt processing program.

As described above, according to this embodiment, even if an operational error occurs during transfer from the semiconductor storage device to the magnetic storage device when the data in the semiconductor storage device is in a random state, the operator can cancel the transfer. Data in the magnetic storage device will not be destroyed.

Effects of the Invention As described above, according to the control method of the present invention, it is possible to prevent data in a magnetic storage device from being destroyed due to operational errors.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining the method of controlling a data storage device of the present invention, and FIG. 2 is a flowchart of the same control method. 1... Control block, 2... Semiconductor storage device, 3... DMA control block, 4...
... Magnetic storage device, 5 ... Display device, 6.
. . . Data bus and control signals, 7 . . . Interrupt signal line. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A semiconductor storage device such as a dynamic RAM is provided as the main storage device, a magnetic storage device such as a magnetic tape is provided as the auxiliary storage device, and a state in which data in a storage area corresponding to the transfer of the semiconductor storage device is worthy of transfer is transferred. A method of controlling a data storage device.