Boss M-512G Boss M-512G Description: Boss M512G RAM Card This optional card provides additional memory for storing custom patches on many Roland instruments including all A/GR/R/JV-series products as well as the VG-8 Guitar System. If your owner's manual states an M128 or M512D/E card, this card is compatible. Boss M-512G Features: Compatibility Keyboards A-50/70/80/90 D-5/10/20/50/70/110/550 JD-800/990 JV-80/90/880/1000/1080/2080 MV-30 U-20/110/220 Drums R-8/70 TD-10 Guitar VG-8 Get your Boss M-512G today!