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I have a sega system 16b board with what I believe is Shinobi Set 3. I already replaced Z80b CPU with the generic one and replaced the A7 rom with the rom image from http://www.retroclinic.com/leopardcats/decrypt/decryption.htm. Still no sound. It sounds like the sound pot is working because if I turn it I can hear a hum get loaded like an amplifier is being turn ed up. I don't see much activity on the Z80b cpu with a logic probe. I do see the reset pin go from L to H on power on but none of the address lines show any activity along with the address lines on the A7, A8, & A9 eproms. The clock CLK pin on the Z80 is getting a pulse. I can list the reading on all Z80 pins if it would help. Any ideas?
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