Konrad Zuse wrote a paper entitled "The Outline of a Computer Divelopment from Mechanics to Electronics" that was published in 1962 (according to the information I have.) As to the models, he writes about the development from 1934 to 1945 "In Germany, a series of machines was developed by the author, which were named Z1, Z2, Z3 and Z4, as well as two special models." Further on he writes "The first program-controlled computer which worked as a complete entity was the German machine Z3 (1941). In the U.S.A. the first computer was the Harvard Mark I, put to use in 1944." The book has some construction details for the machines as well as pictures of the construction of the Z1, the Z4, the Z5 relay computer, and the Z11 relay computer. This information comes from "The Origins of Digital Computers." Russ Blakeman wrote:

Rax wrote: I thought is might be a variant or a name that was similar. I have to say it's one I've never heard of. -------------------------------------------------------------------- Russ Blakeman RB Custom Services / Rt. 1 Box 62E / Harned, KY USA 40144 Phone: (502) 756-1749 Data/Fax:(502) 756-6991 Email: rhblake(a)bbtel.com or rhblake(a)bigfoot.com Website: http://members.tripod.com/~RHBLAKE/ ICQ UIN #1714857 AOL Instant Messenger "RHBLAKEMAN" * Parts/Service/Upgrades and more for MOST Computers* --------------------------------------------------------------------

Christian Fandt wrote: Are these the open frame machines that were used on sunmarines and ships during WWII? There's a sort of "computer" in the U505 submarine in the Museum of Science and Industry on the lakefront in Chicago. -------------------------------------------------------------------- Russ Blakeman RB Custom Services / Rt. 1 Box 62E / Harned, KY USA 40144 Phone: (502) 756-1749 Data/Fax:(502) 756-6991 Email: rhblake(a)bbtel.com or rhblake(a)bigfoot.com Website: http://members.tripod.com/~RHBLAKE/ ICQ UIN #1714857 AOL Instant Messenger "RHBLAKEMAN" * Parts/Service/Upgrades and more for MOST Computers* --------------------------------------------------------------------