There are very good professional software supporting the Roland JD-800 and JD-990, but if you want a non-pay choice, these are the best.
The
JD-800 Patch Organizer created by
Laurent Lecatelier-Dudec (France), was released as freeware in 24/04/1999 (date in original author´s site) and is no more available from the programmer´s site.
In more recent years,
Gwydion Elderwin (Australia) created a JD-800 Randon Bank Creator and a Jd-800 to JD-990 Bank Converter.
About the patch banks here.
The first I found many years ago, was compiled by
Stephen Drake, the guy who kept most of JD material available for years. This site is proud to pay him our tribute. Thanks Stephen!
The first internet banks are so-so grouped, thus makes some sense.
Gwydion also have done a strong work removing duplicates from hundreds of patches, adding lots more and creating a library for each synth. Still is missing time to classify all that stuff into categories.
Missing all you my friends, I know business and daily life take time, but I would be happy to receive some news.
The bank files are in .rar format. You need Winrar or compatible to extract it.
Also: Formats supported: JD-800 SysEx dumps (SYX, MID)
JD-800 VST / Zenology patch bank (BIN)