Thanks Jonathan for the offer. Meanwhile X-rayed the 1643 as well and connected
a really big battery. Here again: Had to start the oscillator before the
UltraBook passed the POST and turned on the display - it is up and running
again now - UltraBook and UltraBook IIi restored. So my final
Power 15 vs 20 is detailed in the hardware manual when to use which
On Sun, Oct 22, 2023, 4:27 AM Chris Zach via cctalk
wrote:
> >
> https://vintagecomputer.net/digital/PDP11-40/PDP11-40_DC-pwr-supplies.jpg
>
> That brings up a question that's rattled around my mind: On a 745 it's
> rated to
I haven't looked at this in a long time, but I believe the H742 "bulk power
supply" puts out a voltage to the regulators to convert to the required
voltages. I don't remember what the voltage is.
Paul
On Sun, Oct 22, 2023 at 3:27 AM Chris Zach via cctalk
wrote:
> >
>
> https://vintagecomputer.net/digital/PDP11-40/PDP11-40_DC-pwr-supplies.jpg
That brings up a question that's rattled around my mind: On a 745 it's
rated to supply -15 volts at 10a, but it has two of the lines designated
as "+15 in". Where did the +15 come from, the other supplies put out
+20,
