Commodore PC 40 - Page 228

90 MS-DOS User's Reference
Sys (System)
Sys
Purpose:
Transfers the MS-DOS system files from the disk in the default drive
to the disk in the specified drive_
Syntax:
sys drive:
Comments:
Updating your system
Usually, you use the sys command to update your system or place C
it on a formatted disk that contains no files_ You must type a drive
letter with this command_
If the system files io_sys and msdos_sys are already on the target .-
disk, they must take up the same amount of space on the disk as L
the new system will need_ This means that you cannot transfer
system files from an
MS-DOS 2_0 disk to an MS-DOS 1_1 disk; instead, I
before the sys command will work, you must reformat the MS-DOS L
1_1 disk with the MS-DOS 2_0 format command_
The target disk must be completely blank or must already contain I
the system files io_sys and msdos.sys_ L
The transferred files are copied in the following order:
IO.SYS I
MSDOS.SYS L
Io_sys and msdos.sys are both hidden files that do not appear I
when you type the dir command_ L
Sys does not transfer the command com fiIt- (the command pro-
cessor)_
So to transfer command com to the target disk, you must .-
use the copy command_ L