Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!newsreader4.netcologne.de!news.netcologne.de!newsfeed1.swip.net!uio.no!news.tele.dk!news.tele.dk!small.news.tele.dk!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.151 X-Spam-Level: * X-Spam-Evidence: '*H*': 0.70; '*S*': 0.00; 'cc:addr:python-list': 0.09; 'stack': 0.13; 'entry.': 0.16; 'parentheses': 0.16; 'subject:assistance': 0.16; 'wrote:': 0.16; '2015': 0.20; 'cc:2**0': 0.20; 'cc:addr:python.org': 0.20; 'lawrence': 0.22; 'sat,': 0.23; 'header:In-Reply-To:1': 0.24; 'equivalent': 0.27; 'message-id:@mail.gmail.com': 0.27; 'cool': 0.27; 'entries': 0.27; 'says': 0.32; 'received:google.com': 0.35; 'ones': 0.35; 'could': 0.35; 'i.e.': 0.35; 'level': 0.35; 'but': 0.36; 'instead': 0.36; 'there': 0.36; 'pm,': 0.36; 'subject:: ': 0.37; 'display': 0.37; 'say': 0.37; 'times.': 0.38; "didn't": 0.39; 'mark': 0.40; 'press': 0.61; 'subject:Need': 0.61; 'show': 0.62; 'more': 0.63; 'python-list': 0.66; 'price': 0.69; 'jul': 0.72; 'faster.': 0.84; 'memories': 0.84; 'to:none': 0.91; 'joel': 0.91 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:cc :content-type; bh=RpjdQhmGsOWoMKSPhdhUAQyC5ZrhOXkuudUu/vHklp4=; b=zHoOmHZrA8AptkKezBb3IYJA/GL5DjYZ/wLA8gxt9mz9iS626c7WxNVJ07y1HW5+Mw 6cb/EJtPGQ+7E1pgTJuLOZJcKOfArAtemiJBlZB3AsDUb4kWiS59G8SIJ01GAjuvl9Ps uPHPPenY2d7jQkWlyEKsHSpsZc3VlJGih9nkxGa0vERaJ2GA8BmPNVmPkWlTvJkRzTXk ceP3qJnpYn8be+cavE+1MEHOxQe8dJEfW9NevPiscsa+9PMhlgj37Qs5Zq+klzqwFIig zmL9gI35kq5Yl44b+S2kshqo8xW2dAjiRFKUT8oTmr8+REU3t3fSisnitTKiBGy54p8r gNOQ== MIME-Version: 1.0 X-Received: by 10.50.88.6 with SMTP id bc6mr4070237igb.24.1437246650477; Sat, 18 Jul 2015 12:10:50 -0700 (PDT) In-Reply-To: References: <225d4ac6-3b88-4844-805b-b4b00cd62ef4@googlegroups.com> <55AA2BDE.6050605@web.de> <201507181216.t6ICGBrY022256@fido.openend.se> Date: Sat, 18 Jul 2015 15:10:50 -0400 Subject: Re: Need assistance From: Joel Goldstick Cc: "python-list@python.org" Content-Type: text/plain; charset=UTF-8 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.20+ Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 37 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1437246657 news.xs4all.nl 2843 [2001:888:2000:d::a6]:52432 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:94059 On Sat, Jul 18, 2015 at 2:51 PM, mm0fmf via Python-list wrote: > On 18/07/2015 18:34, Mark Lawrence wrote: >> >> >> What is an {HP calculator} roll operation? > > > HP calculators were proper in that they used RPN entry. > > i.e. 2 enter 2 + would show 4 instead of 2 + 2 = > > Gawd it's so long but ISTR there were 3 stack registers and the display. So > you could press > > 1 enter > 2 enter > 3 enter > 4 > > and Z = 1, Y = 2, X = 3 and display = 4. Roll would rotate the entries > through the display register. > > ROLL and Z = 2, Y = 3, X = 4 and display = 1 > > and so on. There was an INV ROLL to go the other way. > > The 3 level stack was equivalent to nesting parentheses three times. I only > had a TI-59 as it was half the price of an HP67. The TI had more memories > and program steps and was faster. But it didn't say HP on the front! > I have an hp35. But to be 'really' cool you have to have an hp35 that just says hp. Those were the very first ones -- Joel Goldstick http://joelgoldstick.com