This is a direct drop in replacement for the MOS 5717 IC in the Commodore 1351 mouse for the C64/C128.
In order to install this you will require soldering skill. The old IC will need to be removed without damage to the PCB and the new IC will need to be soldered in.
This is C64/C128 compatible only and will not work with Amiga or Amiga mice which have a different driver.
It is recommended not to purchase this if you are not able to install it, we are not able to give refunds due to damage during installation.