electro-Physics: 3.3 volts

[Dwight K. Elvey]

>From: "John Allain" <allain at panix.com>
>
>Today I started mothballing the VAX 6000 and noticed that a large part
>of its power supply is on 3.3 volts, now common, but probably not in 1988. 
>
>Seems like something was invented, probably in chip design that made
>3.3 so useful.  I wonder what that was, when that landmark was reached.
>
>(For that matter, I don't really know why 5V and
> 12V were popular, on a "first priinciples" basis.)
>
>Maybe we've lost some of the people on the list who can answer these
>questions, but I'm trying anyway.
>
>John A
>

Hi
 RTL was 3.6V.
Dwight