LM-1 Memory Retrofit is a complete assembled solution to replace the original RAM and battery backup. It goes straight into Z80 CPU socket. Compatible with all LM-1 revisions, but depending on the board, Z80 may be installed in the IC socket or soldered down. The package includes a spare machine pin (round pin) socket which only needs to be soldered down if LM-1 doesn't have it or has a poor quality socket.
Factory RAM chips may stay on the board. They won't be used. It's typically safer to remove them as they came installed in sockets. This reduces overall power consumption.
Features:
Replaces original RAM with Non-Volatile FRAM
Backup batteries are no longer needed!
Implements Econo Reset circuitry, no Linn mods required for memory protect on Rev1
Has onboard crystal 3.579Mhz to generate the system clock
Has a reset button to reboot LM-1
Comes with Z80 CPU installed
Please, note the kit doesn't replace the OS ROM or any of the Sound ROMs. It's only designed to replace RAM and improve reset circuity. For more information and installation experience check Really Nice Audio Youtube channel.
You'll receive: 1. LM-1 Memory Retrofit with Z80 CPU 2. Machine pin socket