The original disks were included in Hottest 5 PDSoft CD collection (thanks, EAB). Here are in dms format:
Original Sample Set (DMS)
(no pass)
Moreover, the MMD for the sampledisk demo and the some justice '94 in ADF format:
Urban Shakedown MED Modules (ADF)
(no pass)
Ok now if you have more "original" sampledisks that can be useful like this, post them and i could try to convert for modern DAWs.
Please someone upload it to EAB, i have no privileges to upload, or don't know how