I just found a nice book that I'm sure a few people (Tony in the least) would find interesting (if they don't already have a copy). It's called "HP-41 Synthetic Programming Made Easy" by Keith Jarett. It was published in 1982 by Synthetix. There's no ISBN but it does have a Library of Congress Catalog Card Number of 82-62786. It's 192 pages and seems very in-depth. No results turned up in online used book stores but several web references result from a search, including one here in the Museum of HP Calculators: http://www.hpmuseum.org/prog/synth41.htm -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]