JPS58200360A - Data transfer system - Google Patents

Abstract

PURPOSE:To prevent boundary abnormality from occurring, by modifying final position information on a data set label so that information on the final position of transfer data coincides with information on the cylinder boundary position of a recording medium, and transferring the transfer data. CONSTITUTION:A host computer HOST has a program library PRLB and when one program is saved as one data set on a floppy disk FP by a library editing program LIBE, the LIBE indicates medium conversion to write the program on the FP. Then, the area end address EOE of the data set label DASLA of the FP is collated with the boundary of cylinders of the FP and when they do not coincide, the EOE is changed into an address coincident with the boundary of cylinders to be written in DASLA. Thus, even when the transferred data is set up in the deck of an intelligent terminal device INTTL and the data is read, no boundary abnormality occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transfer method that can prevent problems caused by transferring data to another recording medium (this is called data siphoning).

Intelligent terminal equipment fIt is becoming more and more popular now that fraction processing is becoming more popular. The intelligent terminal device has a programming function and shares some of the functions of the host system, such as data input/output and computation/editing. Various utility programs are prepared for this purpose, and one method of supplying such programs to the terminal device is to use a floppy disk device. The storage format of the medium used in this floppy disk device, that is, the floppy disk, is Ifi4N1, as shown in FIG.

Cylinder #001 has one volume label VOLA
and a plurality of data set labels DA8LA are set. Further, data is stored in cylinders #01 to #73#. Items such as a label identification name, a label number, and a volume serial number are stored in the polynym label VOLA, and each data set label DA81. A is label identification name, label number,
In addition to items such as dataset identification name, area start address B
There are items for OK and area end address EOK.

The area start address BOE is address information indicating the start position of the data set, and the first sector 1 of the cylinder is selected. That is, each data set is defined to be written from the first sector of the cylinder, and a data set often starts from a sector in the middle of the cylinder. Area end address EOE/fi This is address information indicating the area end position of the data set.

It is the last sector of the cylinder that is chosen. That is, the end of each data set's area is not set to a sector in the middle of the cylinder. In this way, the data set area on a floppy disk is in units of cylinders, not in units of sectors that make up the cylinders.

However, when I download the data configured by the host computer to a floppy disk, the data set label 1! ! 0EFi indicates the end position of data in a data set, so when this floppy disk is set up in a disk device and the data is read, a blank error (boundary error) will occur. .

1. In this case, conventionally, the operator has to use a utility to change the area end address EOE of the data set label.

The present invention has been made in view of this point, and aims to reduce the burden on the operator by preventing the occurrence of such back-up abnormalities. Therefore, the present invention is characterized in that when data is downloaded to a floppy disk, the KOE is changed so that the EOE matches the address indicating the current position of the cylinder.

The I$2 diagram is a block diagram for explaining the data transfer method. The host computer HO8T has a program library PRLB in which various programs are stored. Let us now consider the case where one program is transferred from the library editing program L to the floppy disk FP as one data set using BK. Library editing programs L to E not only update, add, and delete the recorded contents of the program library PRLB, but also perform electronic function so-called media conversion of the data to other media.What functions do they perform? is specified by a control statement from program L to E.

Library editing program: E converts media from L to 1
When instructed, the instructed program (data) is written to the floppy disk FP.

Conventionally, when this writing was completed, the end area addresses KO and E of the data cert were written in the middle of the cylinder without being changed, and the writing was completed on the data set label, but in the present invention, as shown in FIG. As shown, E OJ's change previous work is added next to the write. In other words, data writing is completed.

Since it is necessary to change the EOE when writing to a floppy disk FP, it is determined whether the written data is a floppy disk FP. Since the number of sectors constituting one cylinder also differs in the floppy disk FP due to the difference in recording density, it is determined whether the floppy disk FP is capable of double density recording. Since this is set when the floppy disk is initialized, it can be obtained from the floppy disk FP. If the recording density is single density, one cylinder has 26
In the case of one-time density, one cylinder I/I is composed of 52 sectors. Therefore, the EOI in the data set label of the nine floppy disk FP set to double density recording is "XX1026" (
XX indicates the number of cylinders), and 1! in the case of single-density recording. ! OBi'XX0O26
'If it does not match, the backlash abnormality will occur as described above. Therefore, FIOE verification is performed. In other words, KOE is “XX1026” or “X”
If X0O26' does not match, force EOF to K
"XX1026"4 or 'X ) does not need to change mom at all.

Even if the data thus sucked up is set up on the deck of the intelligent terminal device IN'TTL and the data is read out, no irregularity will occur.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing the recording format of a floppy disk, Fig. 2 is a block diagram explaining the process of data downloading, and Fig. 3 is a 70-
It is a chart. In the figure, PR:LB is the program library, I
JBE is the library editing program, FP is the floppy disk, VOLA is the volume label, DA8LA data set label, BOI is the area start address, mo
This is the FliFi area end address.

Claims (1)

[Claims] In a data processing device IC that transfers stored data to a recording medium whose data set area is in units of shillings,
The method is characterized in that the information indicating the final position of the dataset on the dataset label is changed and transferred so that the information indicating the final position of the transferred data matches the information indicating the boundary position of the cylinder of the recording medium. Data transfer method 1゜