Part of CBS: Abbr.

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Possible Answers: SYS.

Last seen on: LA Times Crossword 10 Nov 2017, Friday

Random information on the term “SYS”:

SYS is a command in Microsoft BASIC used to execute a machine language program in memory. The command took the form SYS n where n is a memory location where the executable code starts. Home computer platforms typically publicised dozens of entry points to built-in routines (such as Commodore’s KERNAL) that were used by programmers and users to access functionality not easily accessible through BASIC.


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SYS is an external command of DOS and Microsoft Windows 9x operating systems that is used to make an already formatted medium bootable. It will therefore install a boot sector capable of booting the operating system into the first logical sector of the volume. Further, it will copy the principal DOS system files, that is, the DOS-BIOS (IO.SYS or IBMBIO.COM) and the DOS kernel (MSDOS.SYS or IBMDOS.COM) into the root directory of the target. Due to restrictions in the implementation of the boot loaders in the boot sector and DOS’ IO system, these two files must reside in the first two directory entries and be stored at the beginning of the data area under MS-DOS and PC DOS. Depending on version, the whole files or only a varying number of sectors of the DOS-BIOS (down to only three sectors in modern issues of DOS) will have to be stored in one consecutive part. SYS will try to physically rearrange other files on the medium in order to make room for these files in their required locations. This is why SYS needs to bypass the filesystem driver in the running operating system. Other DOS derivatives such as DR-DOS do not have any such restrictions imposed by the design of the boot loaders, therefore under these systems, SYS will install a DR-DOS boot sector, which is capable of mounting the filesystem, and can then simply copy the two system files into the root directory of the target. SYS will also copy the command line shell (COMMAND.COM) into the root directory. The command can be applied to hard drives and floppy disks to repair or create a boot sector.

SYS on Wikipedia