C64-LINK II is an expansion cartridge for the Commodore 64 that adds 16 disk commands (BASIC 4.0 style) and a machine language monitor to the Commodore 64. It also allows you to use the parallel and IEEE modes of data transmission, permitting the use of any parallel printer, IEEE printer or IEEE disk drive. The C64-LINK II cartridge takes up no memory and is completely transparent to commercial or home software. With this device, you can interface your 64 to the old Commodore dual drives such as the 8050, 8250, as well as other drives using the IEEE parallel connections such as the Commodore 2031 drive. The box has been opened on this, but other than that, this C64-LINK II is still brand new and unused. You can tell by looking at the edge connectors that it has never been plugged into a 64 and no cables have been connected to the other connectors. The manual is in perfectly new condition. Due to the style of the box and the difficulty with opening it, it shows some slight defects, but not bad.