CODA components for 1997:
Cranks and pedals: The Magic Motorcycle designed 900 series crank is available for road or mountain. The 900Downhill crank uses the regular 900M arms but adds a single CNC chain ring with integrated chain guard. CNC hollow arms are fitted with CNC chain rings and a proprietary bottom bracket assembly. The 900 R road crank is available with clear anodized arms and clear or black anodized rings. The 900M crank is available in regular or compact ring sizes and comes with clear anodized arms and your choice of clear or black anodized rings. The 701M and 502M cranks feature on piece CNC chain ring sets that are attached to the right arm via 4 bolts. The M701 weight 550 g and is machined from 7075-T6 aluminum and uses a heavily sculpted spider. The 502M crank appears similar but weighs 640 g and uses less weight saving machine work. The 400M crank is a standard mid-price replacement crank.
Hmmm.... it's hard to be sure, but I think that's saying that the DH version is proprietary. I know there wasn't anything proprietary frame-wise. You can use any bottom bracket you want.