I have always used the S 950 with the IB interface 109, expansion RAM and hard drive since 1992. I 've not I install this same interface, and indeed it is deprecated to do so, if one is not a specialist in. However I purchased and installed the HDD.
You can discern the IB 109 on the photo above, fixed audio outputs situated in the rear of the sampler, right, white is the large 50-pin SCSI connector unit DD, and left the numrique between co-axial to the sampler CD or DAT format, bypassing the A / D converters We can guess, the more left between F. Optics, which I do not use.
J'apprcie much the reliability and robustness of these components like Apple.
Designed originally for the removable disk drive SYQUEST SQ 555 (44 Mbytes), this interface allowed me to connect an SD A2D Macintosch systems on 120 MB, the 120 Ti Drive. The fact affect a n ID 0 7 n and another logical unit 1 8, 64 units can be connected to SD in a daisy chain, if necessary.
I think with the S 950 is the best choice you could make the era, but today we can still find SD compatible, given that IB 109 Pipelines Limited to 64 Mbytes?