Duo 250 emergency disk (System 7.1 and over)

[Christoph Pistor]

My Duo 250 is showing the question mark disk. I tried the original 
system disk from my PB 180c, but it says it needs System 7.1 or over.

Anybody here that knows where I can get a repair disk (i.e. download the 
software) for the Duo 250.

thanks

Chris