RISC forty years before RISC. Zuse was and is an utterly underappreciated genius.
During the latter period, Zuse also created "Plankalkül", the first high-level programming language to be designed for a computer.
Am I reading K4.§1 correctly that intermediate values were kept to about 80 bits?
I am fond of the hack of K3.§5.4. We unroll loops, they rolled them.
Especially important: K5.§1: bugs and workarounds!
But reading up on the details I find that utterly unfair. ENIAC e as way too far away from a programmable machine. It was computation units which just got wired together in different fashion. That is very removed from what a computer is today. The Z1 and later is far closer to what we think of as a computer IMHO, with actual programs being fed into it decoded using registers and and ALU etc.
This year I discovered Knickebein : https://en.wikipedia.org/wiki/Battle_of_the_Beams
A form of GPS if you allow me. A precursor to ILS.
edit : what I wanted to say, it is not limited to Zuse.
edit: Ah, the first emanuscripta link worked: https://www.e-manuscripta.ch/zut/content/pageview/2856521