vacuum tube circuits

At 09:37 PM 7/21/99 +0000, you wrote: I also recently a copy (around $15.00) by searching A.B.E. http://whipper.abebooks.com/abep/il.dll?ph=1 I also managed to locate the companion "Arithmetic Operations..." which is a fascinating book for describing 1957 technologies. Definitely recommend these to anyone interested in tube and very early solid state computers. I found it interesting that this book is the ONLY book I have that includes Edmund Berkeley's "Giant Brains" in it's bibliography. "Brains" is *definitely* a book to add to your library, as well. Easy on the hardware descriptions, but Berkeley was visionary in fortelling the day-to-day uses of computers, writing when computers were mostly relays and the *really advanced* computers had tubes. BTW, A.B.E. is an association of small book sellers, not a seller itself. But their network seems to be extended to a lot of small bookstores. Your actual purchase is transacted with a specific member bookstore. Consequently you get to search the shelves of some really neat stores - the kind that would have old dusty books such as the above. And the prices are usually very fair. I've not bought through bookfinder, but I suspect A.B.E. is similar, judging by the look of their web pages. Gary