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No, if talking about the SB-300.
The header on both boards was 34 pins long, .100". However, the ribbon cables were 2x 16 pin. The last two pins were left unconnected.
Edit: Apparently, games came with anything between 2x16 and 1x16 + 1x18. 
Interesting - you have two 16pins, but one is connected to a 18pin header. Mine's on two 16pin headers. 
Absolutely strange the amount of difference.
Anyone know if those two signals - A14 and IRQ should be connected or not? I actually need a new set of cables, and was hesitant on getting 1-16pin and 1-18pin cable, since my game didn't originally have that in it.
Assuming GPE is going to be making cables. If they're thinking about re-doing the sound board, I would recommend adding a second, mirrored header, .050" 2-row 34pin, for newer ribbon cables. 
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