Mutec has this to say about the FMC-05:
MUTEC's FMC-05, FMC-06 and FMC-07 FlashROM memory expansion cards are exclusively made to easy and reliably increase the storage capacities of various Yamaha music workstations and synthesizers.
- FMC-07 offers worldwide unique 2048MB upgrade capability!
- Non-volatile memory cards of three capacities available: 512MB, 1024MB, 2048MB
- Waveform and sample data retains reliably after instrument is switched off
- Made of FlashROM memories of fastest access times and best long-time reliability
- 6-way multilayer PCBs used to reduce electrical noise during data transfer
- Assembled with components of major manufacturers only
- 100% in-system tested
- High-precision German board assembly and soldering for best possible production quality
- 100% compatible to Yamaha Tyros 4 + Tyros 5, MOTIF-XF + MOXF workstations
- Engineered and manufactured in Germany