MS-DOS on an IBM PC (or clone) with Dual Floppy Disks is still the most secure workstation you can buy today. You can write protect and easily copy the boot med

MS-DOS on an IBM PC (or clone) with Dual Floppy Disks is still the most secure workstation you can buy today. You can write protect and easily copy the boot media. There's no persistent writable storage the user can't manage directly. You can easily manage your risks in a manner that is impossible with modern systems.