Editing ENIAC (section)

===Operation times===
The references by Rojas and Hashagen (or Wilkes)<ref name="Wilkes"/> give more details about the times for operations, which differ somewhat from those stated above.

The basic machine cycle was 200 [[microsecond]]s (20 cycles of the 100&nbsp;kHz clock in the cycling unit), or 5,000 cycles per second for operations on the 10-digit numbers. In one of these cycles, ENIAC could write a number to a register, read a number from a register, or add/subtract two numbers.

A multiplication of a 10-digit number by a ''d''-digit number (for ''d'' up to 10) took ''d''+4 cycles, so the multiplication of a 10-digit number by 10-digit number took 14 cycles, or 2,800 microseconds—a rate of 357 per second. If one of the numbers had fewer than 10 digits, the operation was faster.

Division and square roots took 13(''d''+1) cycles, where ''d'' is the number of digits in the result (quotient or square root). So a division or square root took up to 143 cycles, or 28,600 microseconds—a rate of 35 per second. (Wilkes 1956:20<ref name="Wilkes"/> states that a division with a 10-digit quotient required 6 milliseconds.) If the result had fewer than ten digits, it was obtained faster.

ENIAC was able to process about 500 [[FLOPS]],<ref>{{Cite web |date=2019-03-18 |title=The incredible evolution of supercomputers' powers, from 1946 to today |url=https://www.popsci.com/supercomputers-then-and-now/ |access-date=2022-02-08 |website=Popular Science |language=en-US}}</ref> compared to [[Supercomputer#Performance metrics|modern supercomputers']] [[Petascale computing|petascale]] and [[Exascale computing|exascale]] computing power.