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I don't know what you consider "digital", but........
The "ENIAC" computer from the 40s was "digital". It took up a whole big room, used vacumm tubes witch failed about every 5 minutes, and had computing power less than a Commodore VIC20 from 1982, but used binary code. It was digital, zeros and ones.
I don't know the state of electronic engine control in the late 50s, but transistors came about in the mid 40s. Not wide spread, but they were there. ICs came about the late 50s. A vacuum tube or a transitor is basically a switch. Just like the millions of things in a modern computer chip. Just a bunch of switches.
Military aircraft has had "digital" computers since the late 40s.
Very crude and limited, but definatley digital.
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