Manual - Roland has made manuals for most of their products available as free PDF downloads.
SysEx Basics - Helpful guide to controlling and editing the MKS-50 in real-time from a sequencer or Midi controller using SysEx Midi data.
Patch File - Roland's original Factory Settings for the MKS-50. These are Midi Sysex files compressed in a PC friendly format. Mac users should have no problem downloading this file either.