Vintage Synth Repair

hello list,
i have a roland s750 sampler connected to my 1084s colour monitor via a 
standard rca cable. the video signal comes from the s 750's monochrome 
output so the screen is black and white.
i would like to connect my s750 to my 1084s via an RGB cable to see the 
screen in colour.
do you know where i can find any info on the pin assignments of the 
s750's RGB port and the pin assignments of the RGB port of the 1084s, 
so i can make the cable myself? does anyone sells such a cable?
thank you in advance,
bakis.
[doepfer_a100] group owner