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32-bit floats, 7 bit exponent, 24 bit mantissa, with an extra bit for signifying "special values" (infinity/NaN/0/~0). Fixed-length 8 bit instructions. Two registers. Separate load/store, arithmetic is reg-reg only. Branch delay slots (5 § 1).

RISC forty years before RISC. Zuse was and is an utterly underappreciated genius.




Fascinating. From page 8, §11, in the section on "Unterpläne", it looks also as if it used a kind of function calls and subroutines. "Plan" seems to mean "program", so "Unterplan" is literally subprogram, and it had a facility to automatically return to the point where it the subprogram was called.



>While working on his doctoral dissertation, Zuse developed the first known formal system of algorithm notation[7] capable of handling branches and loops.[8][9]


Also sounds like IEEE 754 forty years before IEEE 754.




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