MATRIXSYNTH: Red Planet SR320 vintage sound expansion card

Friday, January 08, 2021

Red Planet SR320 vintage sound expansion card



via this auction

"Vintage Red Planet SR-320 cartridge which adds 320 additional patch memories to the Yamaha DX-7 vintage synthesizer. This unit plugs directly into the cartridge port on the DX-7. There is an internal backup battery which will need changing (by the buyer) before the cartridge can be used."

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