Leonard Tramiel invited me over recently to see his original ATARI ST design verification prototype, which was hand built.  This unit was constructed in 1984 (on general purpose wire-wrap breadboards which appear to have been etched in 1983). He is planning on donating it to the Computer Museum History Center.
 
 

ATARI ST Prototype Boards:
 

Video Shifter Board

RGB Output

ROMS

ACSI Board (Atari Computer System Interface)

256K X 32 RAM Development Piggy-Back PC Board mounted to Memory Controller Board

Processor Board

CPU

Archive of all board photos
 
 

Other Cool Stuff:
 

Leonard's Commodore B500 (fondly referred to as the "B-52")  (Front / Rear)

Leonard's Data General NOVA 800 16K Core Memory Stack (circa 1973) (ID Legend / Board)
 
 

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