Tom, On the problem with sequential.err2.exp with cam 212 b, what appears to be happening is that layer 1 of module 0 (closest to the interface) first gets its multipurpose register A programmed to be scan input; then, after module 1 is programmed, layer 1 of module 0 is reprogrammed so that its multipurpose A is status in (because module 0 should ignore the scan input pin). Since the output select of pin p53 is the lsb of the MPA reg, this pin switches from rsout to lsout--not the desired result! Doug