MOTM

Please forgive the digital content, but...

Does anyone know anything about this piece, labeled "ddrum Rack  
Module A"? A drum tech friend of mine found this in his attic. He  
says he remembers it from a tour in '86 - apparently it's a mainframe  
that can hold 9 modules, although his has only 5 of the modules, and  
of those only 3 have voice cards. I can't find anything about it on  
the Web. Any help would be much appreciated.

thanks,
Eric