The avionics stack used two 12-pin headers for electrical connection between boards. The A-Stack carried power, arming, and data bus lines, while the B-Stack carried charge activation lines downward to the bulkhead. | The avionics stack used two 12-pin headers for electrical connection between boards. The A-Stack carried power, arming, and data bus lines, while the B-Stack carried charge activation lines downward to the bulkhead. |