Everyone loves the X-15, no?
OK, here's the computer that was developed by Honeywell for the later X-15s, to manage energy so they could arrive back at Edwards AFB at the right velocity and altitude to land. They only got one chance, of course.
This is the Honeywell Alert, a 24-bit computer, one of the first to use integrated circuits, delivered in 1965. it was built on 6 circuit assemblies each with two multilayer boards. These were laminated together with a heat spreader, and then bolted together to heat cunducting plates that carried the heat to the baseplate of the cabinet, where a cooling system carried it away. The computer fits in a 1/2 ATR rack, with a companion memory module next to it. It cunsumed 25 A at 5 V.
Jon