Commodore c16 / plus 4 PLA replacment. I redesigned the layout of this to have virtually the same footprint as the original MOS part meaning the case on a plus 4 should still close (there never an issue with the c16 case closing). If your current PLA is already socketed, it's a straight swap. If not then desoldering the original part will be required. I only use round machined header pins for ease of insertion into an existing socket. Common symptoms of a failed PLA is a black or garbled display output. Shipped in anti-static bag and foam for protection and tested in my personal machine with the diag264 rom before posting.