DM-xxCC Default Display Values Mark Hardman Unregistered Posts: 208 Threads: 16 Joined: Jul 2005 09-12-2012, 09:38 PM Michael has really improved the look of his web site at http://www.rpn-calc.ch/. The home page now features a carrousel of all five calculator models. Mindlessly spinning the calculators, I started wondering why he chose the various default display values for each model: ```DM-10CC = 1.7321 Easy, 3 SQRT DM-11CC = 1.4142 Again easy, 2 SQRT DM-12CC = 1.55 The best I that I can come up with is: 111 LN LN DM-15CC = 1.6180 Pure gold, 5 SQRT 1 + 2 / DM-16CC = AA55 H Again, no idea: BIN 1010101 Enter Enter 1001 RLn + HEX or HEX 55 Enter Enter 9 RLn + ``` Does anyone have a better solution for the DM-12CC or DM-16CC? Maybe Michael could give us the real answers. Mark Hardman Cristian Arezzini Unregistered Posts: 372 Threads: 42 Joined: Mar 2011 09-13-2012, 05:22 AM About the "AA55": don't think too much about mathematics there, remember it's a programmers' calculator. And "AA" and "55" are two bytes often used for memory testing, as they have a peculiar bit pattern - AA is 10101010 and 55 is 01010101. So it might just be a tribute to old-style computer programming, which is what the 16C was for. Dale Reed Unregistered Posts: 73 Threads: 2 Joined: Sep 2011 09-13-2012, 02:28 PM It goes back even further than that. In the old Teletype days (Western Union Telex et al), they used to send a line of "RYRYRYRYRYRYRY"... in order to "exercise" the send and receive contacts. These machines use the old 5-level (5-bit) "Baudot" code. R and Y are the TTY equivalent of 0xAA55 for memory tests --- their bit patters are 01010 and 10101 (but I don't remember offhand which is which). They especially look nice punched into paper tape! ```| o o o o o o o o o | o o o o o o o o | o o o o o o o o o | o o o o o o o o | o o o o o o o o o ``` Dale, W8ABZ (Don't ask how many Teletype (R) Model 19ASR, 28ASR and 32ASR machines I fixed back in the radio club in college days....) Lode Unregistered Posts: 101 Threads: 11 Joined: Jun 2011 09-13-2012, 03:42 PM I wonder what the keys of the ones with titanium housing will be like! « Next Oldest | Next Newest »

 Possibly Related Threads… Thread Author Replies Views Last Post [HP Prime] Constants Library Values Timothy Roche 24 7,248 11-02-2013, 04:17 PM Last Post: Les Koller HP 35s - multiple program input values? Arno 3 1,622 04-29-2013, 11:27 AM Last Post: Gerson W. Barbosa DM-1x Silver vs. DM-1xCC Aluminum quality? bhtooefr 11 3,286 04-14-2013, 07:08 PM Last Post: bhtooefr [wp34s] Alternative MIO (allows calculations when entering element values) David Maier 1 1,040 02-03-2013, 02:51 PM Last Post: Marcus von Cube, Germany Flashing the DM-15CC Geoff Quickfall 11 3,394 01-14-2013, 05:18 AM Last Post: Mike (Stgt) Review of the DM-16CC hpnut 1 1,123 01-04-2013, 04:21 PM Last Post: Guido (Canada) Default angle mode Eric Smith 71 13,687 12-06-2012, 01:19 AM Last Post: Eddie W. Shore DM 15CC silver edition arrived! Hans Holzach 10 3,185 12-05-2012, 01:40 AM Last Post: Juergen Keller dm-15cc battery life David Griffith 7 2,338 12-04-2012, 10:07 PM Last Post: Walter B Can the display for a HP32Sii be replaced with the display from another model? Bruce Larrabee 8 2,809 10-10-2012, 10:05 PM Last Post: Luiz C. Vieira (Brazil)

Forum Jump: