M-64C memory cartridge

This early 1980's Roland M-64C cartridge is compatible with Roland:

TR-909, MKS-80, MKS-70, MKS-30, MKS-20, MKS-10, TR-707, TR-727, Alpha Juno 2, GR-700, GR-77B, JX-3P, JX-8P and JX-10.