You might wanna do some research at the archives of Keyboard, EQ, Mix and Electronic Musician magazine and maybe the Source. There are some interviews with folks around that explain quite a bit. Rick Rubin, Davey DMX, Kwame, DST, Arthur Baker, Joe The Butcher....
Most equipment was consistent with whatever was recent or old skool for studios at the time. Very few people in Hiphop had home studios in the 80s.
Peace.
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