Oberheim OB-X (IB).bin - single ROM version, requires hardware mod (http://www.retrosynth.com/docs/obx/rom_hack/)

For units with serial numbers 794801 and later
Remove 2708 EPROMs from IC sockets U102, U103, and U104 
Remove 7442 decoder from IC socket U108 
Cut -5V and +12V traces on top rear of CPU board as indicated 
Power up unit 
Verify no -5v present on U126 pin 21 and no +12v present on U126 19 
Power off unit 
Connect U108 pin 12 to U126 pin 20 
Connect U108 pin 14 to U126 pin 21 
Connect U108 pin 15 to U126 pin 19 
Insert programmed 2732 EPROM into IC socket U126 
Power up unit, test, and enjoy 
2732 EPROM address mapping:

2708 ROM0 (U104) 0x0000-0x03ff -> 2732 0x0000-0x03ff 
2708 ROM1 (U103) 0x0000-0x03ff -> 2732 0x0400-0x07ff 
2708 ROM2 (U102) 0x0000-0x03ff -> 2732 0x0800-0x0bff 

OBX rev IB for 2732 EPROM [BIN] - Checksum 000472AD 

Taken from: http://www.retrosynth.com/docs/obx/rom_hack/
