OBERHEIM SYNTH

Anybody have a working OB-Sx and an eprom burner who is willing to copy and send the data to me? My Sx freezes with the first four patch LEDs lit when it is switched on. No sound and no response otherwise. Tracing the data lines it seems that the OS rom isn't outputting correctly, but then again those lines go elsewhere too so it may well be somewhere else. I would just like to be sure I have good data in the roms. The Z80 is new, as well as all the 4051/3 cmos. +12, +/-15, +/-5, 5.6 and -10 supplies are correct.
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Doug

synthparts.com

There are several versions of the OBSX ROMs. Some of them use the switch on the back with 2 banks of sounds, some don't... I can read and write 2708s f needed...

Sent from my iPad

On Mar 24, 2014, at 6:19 PM, "synthparts@..." <synthparts@...> wrote: