Oberheim OB-SX synthesizer
Six voice with 56 programs

.30	2708	stickered	SX-C0
.31	2708	stickered with a green dot	silkscreened	SXC1
.32	2708	stickered with a green dot	silkscreened	SXC2

Mame .289
C:\sams_old\roms>c:\games\mame_command\mame -romident C:\sams_old\roms\obsx\roms 
Identifying C:\sams_old\roms\obsx\roms....
obsx.30              NO MATCH
obsx.31              NO MATCH
obsx.32              NO MATCH