Apple IIGS ROM03 with "Turbo->28"

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Apple IIGS ROM03 with "Turbo->28"

Hi, all

Any one has idea on Apple IIGS ROM03 with boot screen first line "Turbo->28" rather than "Apple IIGS"? Is it an early ROM03 unit, developer unit or?
I couldn't find any information from the web.

Thanks,
Michael