That first reference claims that it was binary.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [[email protected]] on behalf of CM Poncelet [[email protected]] Sent: Tuesday, May 31, 2022 6:30 PM To: [email protected] Subject: Re: Tabulating Machines (was "... z114") >From memory, the LEO (Lyons Electronic Office) computer of 1951/2 used decimal (not octal or hexadecimal) digits. I cannot find a reference to it, but this might help: https://secure-web.cisco.com/1lqLPsi8pgcBphdRkYWcWq1YfB-vO7e0osBbEDBCablooEId4P_sf9wSxYwrUm2FirV2oEKCVtKIuafWzPsYygBbkBe7qC05pM8kkLTjEXK3hy-9Y3Zh2iaOsHq3wEsnX9MV09XKqk0465b9QaAPyjLLs8XE-pdfwQ2d3OZJYKdmu2zhKmcfO_FqaJClFDD9E-KD2dGYnNEgi0ziFyBqepPVuEenD3n2tiEllIon7xs4xU1Pa_GY4Ft1kuLxUDifAkZRIcbcYKgUi2ayEfEwVFsT3BPUk4e18ZR2KCpiqMb4CFlXz2k2sFZrR5PxBIY49LsGqmvzxeTeBb3K1Vc5xffJQ8o8dZBLfpY2liEXO2d38K5sDfcV-CQBqfJltW4jVyyAu2AjEvaJEG6E1uusq4L0BTFZPZ9n8DAvwTo0PIrSN9cO0b_qjukFLk2U4XvpI/https%3A%2F%2Fwww.zdnet.com%2Farticle%2Finside-leo-the-first-business-computer%2F https://secure-web.cisco.com/1GNBBKWkGW9qFz1YKvcFM2DLr6GMDg3fzNF3aV41aVSFYaJjrKOlXADiA-WS8u7f86ucBmlNhxtNWWzoL8H6IOpcl9bE0wD5WW5ztWLq9PvYr0ogh9a4sy-2AkDAR6Vbj3Ut0KWte62DK9i3uHppOk4jzbXccBi15prMvlukktZIK8yuEKOKtmaSdKUxrLNG7YHt-O-QQ5bK85HarVTUAusRtsjypm2rVnV_LKFLGtO-e-TFne4NE4Q5doMj7xSArMTkyga59nHJYYC-TVsOlIUvSCwsvp4EceUDx24RzWfwXWOYsz98TcUbprCIbtWZT5uUqiy4E9Yd-RTjqxo_0NpJu0Omb8t7SgUXmtTs58ASrKvyhBEr0RvR80gzYk98ErmTUfl7UhliGuXY8CRXmh8n4YGyhOgLIgxD0bzmUq93JmxUo8djlwpj9sljzmAaw/https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FLEO_%28computer) On 30/05/2022 19:35, Warren Brown wrote: > COOL > On Monday, May 30, 2022, 06:57:59 AM EDT, Seymour J Metz <[email protected]> > wrote: > > I would expect to see finite difference calculations in the 1960s on a 60x > or 610 rather than a 407, although the Manhattan Project did do calculations > on a room full of tabulators. > > Displaying operational registers using, e.g., Nixie tube, was quite common > for decades. I know of machines that displayed individual bits and machines > that displayed octal digits; I suspect that there were machines that > displayed decimal digits. > > > -- > Shmuel (Seymour J.) Metz > http://mason.gmu.edu/~smetz3 > > ________________________________________ > From: IBM Mainframe Discussion List [[email protected]] on behalf of > Paul Gilmartin [[email protected]] > Sent: Sunday, May 29, 2022 8:45 PM > To: [email protected] > Subject: Re: Tabulating Machines (was "... z114") > > On Sun, 29 May 2022 17:11:33 -0700, Charles Mills wrote: > >> I have never programmed a Tab machine but here is what I know. >> >> The addition and so forth was purely mechanical. Anyone remember >> old-fashioned mechanical adding machines? Picture a wheel with ten cogs on >> it numbered 0 through 9. Let's say it is indicating 5. If you turn it three >> clicks it is now indicating 8. Voila! 5 + 3 = 8. Let's say you turn it three >> additional clicks. It is now reading 1, and on the way from 9 to 0 it poked >> the wheel to its left one position. 8 + 3 = 11. >> >> Yes, the plug board's purpose was to hold the wires ... >> > Mid 1960s. A colleague told me (third hand story) of someone who had > programmed > a 407(?) to extract second differences -- differences of successive > differences of > successive inputs -- discrete second derivative. > > The Numeric Analysis Center of the University of Colorado had an open-access > SCM electronic calculator. Its registers were continuously visible on a CRT > display in stroked characters. I could watch it extract a square root using > Newton's Method in 44 seconds. Beside it was a mechanical Friden with > cogwheel > registers continuously visible. I could watch it extract a square root by > subtracting > successive odd numbers in 22 seconds. > > -- > gil > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > . > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
