Sharp MZ-700 Basic Manual

10What the DISK BASIC isThe DISK BASIC has a strong file control function relative to the cassette base. BASIC. For example, it makes the most of the features of a disk base which hashigh-speed read-outlwrite-in capabilities, and, more than simply serving for datastorage, the file makes it possible to use the data area directly connected to thecomputer system.Moreover, because this DISK BASIC also includes the control functions related to theRS-232C interface, it makes it possible to control various devices, by using theMZ-SBI03 serial interface (optional).Thus, it can be said that the DISK BASIC is a new system software which permits theexpansion of the software range of the personal computer.By understanding this DISK BASIC and making full use of its many functions, theuser can create a higher level system.• FileThe computer can exchange data and programs between peripheral devices (floppydisk, cassette recorder, printer, etc.). The units of these data and programs are calledfiles.• File cl.ssificatlonThere are two types of files: data files and program files.1Data files ..... These files store numbers, characters, etc. as data.(BASIC sequential access data files ..... BSD)Files BASIC random access data files ..... BRDProgram files ..... These files store programs just as they are.(BASIC text programs ..... BTX )Machine language programs ..... OBJComputer systems can be thought of as either of two fundamental types of systems:logical internal systems composed of data-processing equipment and main memories,and external filing systems composed of processed data and program banks.