A Complete History Of Mainframe Computing

[Chuck Guzis]

On 3 Jul 2009 at 20:14, Jerome H. Fine wrote:

> Just a suggestion.  Up to about 1960, most (all?) computers were
> vacuum tubes.  You might want to use that for the initial separation
> and specify a different set of parameters for vacuum tubes vs
> transistors.

...except when they weren't. (e.g. Univac SS80/SS90--only the clock 
generator used tubes--all of the computation was magnetic logic, 
diodes and transistors).    NEAC 1101/1102 (parametrons).  There were 
certainly others.

--Chuck