Looking at this site http://www.geocities.com/korgdddmods/index (http://www.geocities.com/korgdddmods/index)
It seems that making your own "rom cards" is rather straight foreward.
(http://www.geocities.com/korgdddmods/News_Update_files/DDDROMpcb1.jpg)
(http://www.geocities.com/korgdddmods/News_Update_files/ddd1romcard1.jpg)
The last update was almost 8 months ago so it seems this project is dead..
Can anyone shed some light on the preperations of the samples before they get burned to the EPPROM ? I'm guessing you might know something about this Gordon..
Like most early digital drum machines, the samples are probably 8-bit, probably unsigned although they may use some oddball coding like ยต-law (the Sequential Drumtraks has this). If you can pull an existing ROM or even the internal one, it should be possible to work it out from that.
I have a couple of the original cards.. How would one do that ? I have no experience with EPPROMS and the like..