maybe some non-germans here, that do not know the buchty.net site? it is a great resource for sq80 and esq1 addicts,.. [www.buchty.net] Section Ensoniq
find also schematics here.
if you do not get enough check out my “consequencer” (below the sq80 basic info).
schöne site über ensoniq synthesizer von reiner buchty (memi)