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The Sophisticated Operating System, or SOS , is the primary operating system developed for the Apple III computer. The system was developed by Apple Computer, Inc. and released in 1980. SOS makes the resources of the Apple III available in the form of a menu-driven utility program as well as a programming API. The Apple III System Utilities program shipped with each Apple III computer. It provided what today would be called the end user "experience" of the operating system if the user were running it instead of an application program. The System Utilities program was menu-driven and performed tasks in three categories: #Device-handling commands: Copy, rename, format, verify volumes (drives); list devices; set time and date #File-handling commands: List, copy, delete, rename files; create subdirectories; set file write protection; set prefix (current working directory) #System Configuration Program (SCP): Configure device drivers. ==Technical details== SOS was a single-tasking operating system. A single program is loaded at boot time, called the interpreter. Once running, the interpreter could then use the SOS application programming interface to make requests of the system. The SOS API was divided into four main areas: *File Calls: Create, destroy, rename, open, close, read, write files; set, get prefix (current working directory); set, get file information; get volume information; set, set mark, EOF, and level of files *Device Calls: Get status, device number, information of a device; send device control data *Memory Calls: Request, find, change, release memory segment; get segment information; set segment number *Utility Calls: Get, set fence (event threshold); get, set time; get analog (joystick) data; terminate. SOS had two types of devices it communicated with via their device drivers: character devices and block devices. Examples of SOS character devices are keyboards and serial ports. Disk drives are typical block devices. Block devices could read or write one or more 512-byte blocks at a time; character devices could read or write single characters at a time. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Apple SOS」の詳細全文を読む スポンサード リンク
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