Memory Backup for Roland Products: Alpha Juno 2, GR-700, GR-77B, MKS-10, MKS-20, MKS-30, MKS-70, MKS-80, TR-707, TR-727, TR-909, JX-3P, JX-8P, JX-10
- Switches: Memory Protect On/Off
- Dimensions: 66 mm (W) 54 mm (H) 14 mm (D)
- Weight: 41 g
Introduction to the Roland M-64C:
The M-64C is the "big brother" to the more common Roland M-16C memory Cartridge. This cartridge can be used with the Alpha Juno 2, GR-700, GR-77B, MKS-10, MKS-20, MKS-30, MKS-70, MKS-80, TR-707, TR-727, TR-909, JX-3P, JX-8P, JX-10.
The M-64C was part of a trio of memory cartridges. Along with the M-64C there is the very rare M-32C, and the M-16C. Inside the M-64C are four Toshiba TC5517AFL 8 x 2K static RAM chips with a lithium battery to power the chip and protect the memory contents.
The original projected life span of the battery was five years, but many of these batteries are still at work twenty-five years later. However, I have seen a few M-64Cs, with dead batteries. Replacing the battery is a bit of work, you will need some desoldering tools, and patience getting the pins lined up when installing the new battery.
