Have you heard of Collosus? The computer that they *did* have, and which was used for cracking cyphers created by Lorenz machines. It's shown towards the bottom of this page: http://www.bletchleypark.org.uk/page.cfm?pageid=206 Cheers, Howard Winter St.Albans, England Yes, indeed, I've read a good many books on the events at Bletchley, including Colossus. Remarkable machinery indeed. I regret not being able to make it to visit the Bletchley Park Museum on my last visit to the UK, but its schedule didn't match mine. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist