Abstract: When the size of a file which has been read out from a magnetic disc unit less than a predetermined value, a CPU the file onto a magnetic tape of a magnetic tape unit as an archive file of a standard form to which attribute information where its size is represented by octal numeral is added. On the other hand, when the size of the file is the predetermined value or more, the CPU records such a file onto the magnetic tape as an archive file of an expanded form to which attribute information where the size of the file is represented by hexadecimal numeral and including identification symbol indicating hexadecimal representation is added. Where the attribute information of the recorded archive file does not include identification symbol, the archive file is reproduced as a standard form. Where the attribute information includes identification symbol, the archive file is reproduced as an expanded form.

Abstract: When the size of a file which has been read out from a magnetic disc unit (5) is less than a predetermined value, a CPU (3) records file onto a magnetic tape of a magnetic tape unit (6) as an archive file of a standard form to which attribute information where its size is represented by octal numeral is added. On the other hand, when the size of the file is the predetermined value or more, the CPU (3) records such a file onto the magnetic tape as an archive file of an expanded form to which attribute information where the size of the file is represented by hexadecimal numeral and including identification symbol indicating hexadecimal representation is added. Further, in the case where attribute information of the archive file recorded on the magnetic tape does not include identification symbol, the archive file is reproduced as an archive file of a standard form.

Abstract: In a cordless telephone set, a base unit which itself has no loudspeaker function is made to provide a loudspeaker function at low cost. The base unit 2 has a transmitting circuit 22 for transmitting an aural signal and data to the handset 1 and a receiving circuit 23 for receiving and extracting the aural signal and data transmitted from the handset 1. A line interface circuit 25 coupled to a telephone line 3, a loudspeaker 44, and a selector circuit 28 for switching connection of the aural signal line between the transmitting circuit 22, the receiving circuit 23, the interface circuit 25, and the loudspeaker 44 are provided. In normal use, the transmitting circuit 22 and the receiving circuit 23 of the base unit 2 are connected with the line interface circuit 25 via the selector circuit 28. When predetermined push buttons 17 on the handset 1 are operated, the base unit 2 controls the selector circuit 28 so that the telephone line 3 is connected to the loudspeaker 44 via the selector circuit 28.