tag:blogger.com,1999:blog-2433841880619171855.post699291008774754392..comments2024-06-17T08:13:20.015+01:00Comments on Pat'sBlog: Microsoft Mathematics is FREE!Unknownnoreply@blogger.comBlogger6125tag:blogger.com,1999:blog-2433841880619171855.post-16618856018049343862011-01-21T02:06:48.327+00:002011-01-21T02:06:48.327+00:00It's the HP-45! Yay! Or ... Eureka! By jove, I...<a href="http://www.hpmuseum.org/45.jpg" rel="nofollow">It's the HP-45!</a> Yay! Or ... Eureka! By jove, I've got it! Thank you kindly, sir!<br /><br />(And I know what you're thinking .... "Please don't call me 'Sir', I work for a living.")<br /><br />That's it! What I remember was the HP-45 retailed for $395 in 1973-4. That's not adjusted for today's $$$, that's what it cost then! Pricey? you betcha. 20 years later if not less , a handheld Casio did the same ... for $10 !<br /><br />Well ... the Japanese were experts at duplicating American products, improving them and selling them cheaper, right? Now this stuff is free!<br /><br />Being a poor college boy, I bought a Texas Instruments SR-50. THAT cost $175 ... cheap! (?) Bear in mind that was the age of $0.50 per gallon gasoline. <br /><br />Both were quality products, HP's slightly better. Here's to Bill Hewlitt for inventing the handheld pocket calculator. The first model was the HP-35. He thought they'd sell 50,000. They were off by an order of magnitude. I love success stories. :-)<br /><br />Next up ... the Imsai 8080. Remember?Steven Colyerhttps://www.blogger.com/profile/10435759210177642257noreply@blogger.comtag:blogger.com,1999:blog-2433841880619171855.post-28916674255940887262011-01-20T20:59:26.132+00:002011-01-20T20:59:26.132+00:00Steven, Try looking here...
http://www.hpmuseum.o...Steven, Try looking here...<br /><br />http://www.hpmuseum.org/ <br /><br />the hp on-line museum...Pat's Bloghttps://www.blogger.com/profile/15234744401613958081noreply@blogger.comtag:blogger.com,1999:blog-2433841880619171855.post-34918726023218260052011-01-20T20:37:34.001+00:002011-01-20T20:37:34.001+00:00Thanks, Pat! More than I expected, cool. :-)
Stil...Thanks, Pat! More than I expected, cool. :-)<br /><br />Still wondering about that Hewlitt-Packard model though ....Steven Colyerhttps://www.blogger.com/profile/10435759210177642257noreply@blogger.comtag:blogger.com,1999:blog-2433841880619171855.post-63393691913774858772011-01-20T16:52:07.554+00:002011-01-20T16:52:07.554+00:00Steven,
For log(-1), 1/0, and sqrt(-1) in REAL mo...Steven,<br />For log(-1), 1/0, and sqrt(-1) in REAL mode it gives "indeterminant", but in COMPLEX mode, it gives <br />ln(-1) = pi*i (gotta love that)<br />and for 1/0 it gives infinity<br /><br />and it seems to handle certain irregular integrals..Int(1/x^2, from 1 to infinity) it gives =1.. <br />for the summation from 1 to infinity of 1/x^2, it gives the correct decimal to 13 decimal places for pi^2/6.. which is also pretty nice..Pat's Bloghttps://www.blogger.com/profile/15234744401613958081noreply@blogger.comtag:blogger.com,1999:blog-2433841880619171855.post-15842109864246354102011-01-20T10:53:32.779+00:002011-01-20T10:53:32.779+00:00A question. If you divide by zero, does it give yo...A question. If you divide by zero, does it give you an error message?Steven Colyerhttps://www.blogger.com/profile/10435759210177642257noreply@blogger.comtag:blogger.com,1999:blog-2433841880619171855.post-54799768201725659552011-01-20T08:24:27.707+00:002011-01-20T08:24:27.707+00:00Remember the Texas Instruments SR-50 calculator? L...Remember the Texas Instruments SR-50 calculator? Look how far we've come. Btw, there was an HP calculator with RPN that was popular around the same time (1974). What was that model's name? <br /><br />Thanks for this, Pat. I never heard of it. I'll check it out, thanks.Steven Colyerhttps://www.blogger.com/profile/10435759210177642257noreply@blogger.com