When Spacelab Flew: Reverse Engineering a Processor Built Without Microchips

This reverse-engineering analysis of Spacelab's Mitra 125 minicomputer unveils a pivotal moment in space computing history. Unlike modern systems built on single-chip microprocessors, this 1980s French computer assembled its 16-bit processor from multiple circuit boards—reflecting the engineering constraints and design philosophies of early space missions. For hardware engineers and computing historians, it reveals how architectural complexity once substituted for raw processing power in critical space systems.