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It was possible to wire the carry of one accumulator into another accumulator to perform [[double precision]] arithmetic, but the accumulator carry circuit timing prevented the wiring of three or more for even higher precision. ENIAC used four of the accumulators (controlled by a special multiplier unit) to perform up to 385 multiplication operations per second; five of the accumulators were controlled by a special divider/square-rooter unit to perform up to 40 division operations per second or three [[square root]] operations per second.
The other nine units in ENIAC were the initiating unit (started and stopped the machine), the cycling unit (used for synchronizing the other units), the master programmer (controlled loop sequencing), the reader (controlled an IBM punch-card reader), the printer (controlled an IBM card punch), the constant transmitter, and three function tables.{{sfn|Clippinger|1948|loc=Section I: General Description of the ENIAC – The Function Tables}}
===Operation times===
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*Rojas, Raúl; Hashagen, Ulf, editors. ''The First Computers: History and Architectures'', 2000, [[MIT Press]], {{ISBN|0-262-18197-5}}
*{{cite book |title=ENIAC: The Triumphs and Tragedies of the World's First Computer |author-last=McCartney |author-first=Scott |publisher=Walker & Co. |date=1999 |isbn=0-8027-1348-3 |ref=SCOTT}}
*{{cite journal |last1=Clippinger |first1=R. F. |title=A Logical Coding System Applied to the ENIAC |journal=Ballistic Research Laboratories Report |date=29 September 1948 |issue=673 |url=http://ftp.arl.mil/~mike/comphist/48eniac-coding/|ref=harv|access-date=2010-01-27 |dead-url=no |archive-url=https://web.archive.org/web/20100103050402/http://ftp.arl.mil/~mike/comphist/48eniac-coding/ |archive-date=2010-01-03|others=[http://www.dtic.mil/docs/citations/ADB205179
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