30 Aug
2006
30 Aug
'06
8:46 p.m.
I recently got a book titled High-Speed Computing Devices 1st ED. 1950. This
is a design survey of how to build an electronic digital computer and has
schematics of gates, adders and accumulators done in vacuum tubes. At the
time there were around 10 working computer in the U.S.
I have been adding to my magazine scans. I found a decade counter circuit
implemented with four 12AU7 tubes (dual triodes) in the October 1955 Radio &
Television News. (50 year rule.)
http://www.swtpc.com/mholley/ElectronicsWorld/Oct1955/RTVN_Oct1955.htm
It is almost the same circuit Don Lancaster implemented with RTL ICs in the
February 1968 issue of Popular Electronics.
http://www.swtpc.com/mholley/PopularElectronics/Feb1968/PE_Feb1968.htm
Michael Holley
www.swtpc.com/mholley