A show on a calculator? Yep, it all adds up. Welcome to Show 070! This week's Topic: The HP-41C Programmable Scientific Calculator! Topics and links discussed in the podcast... What's Dan Bricklin, creator of VisiCalc, up to these days? Find out in an online interview at LowEndMac.com! Check out the HP41 page on The Museum of HP Calculators for a good write-up on the 41! The HP41.org site has…