Korg DW8000, Mono/Poly, MS-20...

Hello

i have inherited a Korg DW 8000 with no manual, no power cord,no Korg 
cassette tape, etc. i have visited divine something website and 
downloaded the manual, voices in sys format. 
How do you load individual sys onto the 8000 if my pc does not have 
midi interface? 

Any help with be good. 

Thanks.