T - correct. Stand corrected, it does not mention the 900.

My OS date is 3/11, but the ser # is 600... Is it possible someone played this for 3 years and never upgraded? With the serial number, is the history of my board available for consumer info/repairs/warranties?
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)