1 Feb
2025
1 Feb
'25
9:31 p.m.
On 01/02/2025 19:10, Paul Koning via cctalk wrote:
On Feb 1, 2025, at 8:37 AM, Frank Leonhardt via cctalk
<cctalk(a)classiccmp.org> wrote:
I started with minilogs which were +/- 10V logic.
Anyone remember those?
I certainly agree TTL would have made sense for
microprocessors but earlier computers ran at much higher voltages, and lots of them :-)
So did early logic ICs. TTL happens to be very well known because it was far more
successful than others, but it was preceded by DTL (6 volts) and RTL (3.6 volts). Also,
in the days of TTL, you might also find high end systems with ECL in them (-3 volts??? I
forgot).
And yes, of course in discrete transistor computers the voltages would be all over the
map. 6 volts in the CDC 6000 mainframes, who knows what else in other machines of that
era.
paul