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 ▼ John Limpert Member Posts: 172 Threads: 13 Joined: Jul 2005 03-11-2005, 01:04 PM While looking at the documentation for a Casio calculator, I noticed that it had base conversion support for pental. Has anyone seen that feature in other calculators? What might it be used for? ▼ Crawl Senior Member Posts: 306 Threads: 3 Joined: Sep 2009 03-11-2005, 04:56 PM Some Sharps (like the 506W) have that feature. I've assumed it's mostly fluff. ▼ Ronald Member Posts: 170 Threads: 26 Joined: Mar 2007 03-11-2005, 05:09 PM Hi, Maybe I have become rusty in my grey cells, but what is a "pental" Thanks Ronald ▼ John Smitherman Member Posts: 177 Threads: 12 Joined: Jan 1970 03-11-2005, 06:19 PM I assume that pental means base 5 whereby decimal 5 would be represented by 10 and decimal 10 would be 20. I've never seen a computer that uses base 5. I've worked on several that use base 2, base 8 and base 16. John ▼ Mark Hardman Member Posts: 208 Threads: 16 Joined: Jul 2005 03-11-2005, 09:23 PM I think the most common use of the pental numbering system is by prisoners in institutions of incarceration. Prisoners mark the passage of days by marking on the wall. Days are counted using four vertical strokes for the first four days. The fifth day is marked with a diagonal line across the group of four. After that, a new group of five is started. Here's an example from a modern pentaltentiary. ;) Mark Hardman Houston, TX Edited: 11 Mar 2005, 9:31 p.m. ▼ John Limpert Member Posts: 172 Threads: 13 Joined: Jul 2005 03-12-2005, 12:00 AM Actually, that's a unary numeral system. V-PN Posting Freak Posts: 785 Threads: 13 Joined: Jan 2005 03-12-2005, 12:55 AM Is it Hard, man, to Mark the walls? (-; [VPN] Monte Dalrymple Senior Member Posts: 297 Threads: 25 Joined: Nov 2006 03-12-2005, 11:56 AM Isn't the abacus a base-5 machine? Vieira, Luiz C. (Brazil) Posting Freak Posts: 4,027 Threads: 172 Joined: Aug 2005 03-12-2005, 06:19 AM Hi; based on what I see and teach, the 'number' that describes a 'base number' expresses the quantity that cannot be represented in the 'base number' with a single algarism. You see, octal, base eight, uses eight algarisms and the last one is seven. The decimal quantity 'eight' is represented as '108' or '10o'. Pental refers to a base number with five algarisms, being them 0, 1, 2, 3 and 4. The decimal quantity 'five' should be expressed '105'. Intriguing! Cheers. Luiz (Brazil) Mike Sebastian Member Posts: 81 Threads: 4 Joined: Jul 2005 03-12-2005, 01:01 AM Which Casio calculator? The latest Sharps, which include the EL-506W, are the first calculators I've seen with base 5. ▼ John Limpert Member Posts: 172 Threads: 13 Joined: Jul 2005 03-12-2005, 06:59 AM You're right. It was a Sharp EL-506WB. I had it confused with another calculator.

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