New EPROM chip diagnostic test v.1.3Use this chip to test the RAM chips of the CPC 6128/ 664/ 464.This utility diagnoses and reports any faulty RAM ICs during boot and also shows other system information.In this way, you can easily locate any faulty RAM chip(s) and replace them.It is installed in the place of the "lower" ROM of your CPC (look list below!) on a socket on the motherboard. No modification of motherboard needed.This IC is installed directly in the place of the following ICs:40009, 40022, 40025, 40037, 40038, 40050, 40051You will have to desolder the factory IC, solder a socket in place and then put the EPROM in the socket.Fast shipping with tracking