PDP-11 with ATX power supply

Joseph Lenox lenox.joseph at gmail.com
Sat Mar 7 22:17:45 CST 2015

Well, you could make some clock-generation hw and run it off the 5V 
standby on ATX. Seems straightforward-enough.

On 03/07/2015 09:38 PM, Earl Evans wrote:
> Hello fellow DEC enthusiasts,
> I have a BA11-N mounting box with Q18 9-slot quad-height backplane. The
> power supply is toast. My goal is to hack it into something useful.
> I'd like to replace the power supply with a sufficiently-powered ATX PSU.
> I've read the instructions at:
> http://www.diane-neisius.de/pdp11/index_E.html#atx
> However, unlike the DEC PSU, the ATX power supply won't supply a 60 Hz line
> time clock (LTC) signal to the backplane via BEVENT. So, my question - has
> anyone used a standard ATX PSU for a PDP-11 QBUS system, and if so, how'd
> you work around the LTC issue?
> Once I solve the power issue, I have 11/23 CPU cards, RAM, and SLUs galore.
> I'm not planning to make this very power hungry though.
> Thanks!
> - Earl

--Joseph Lenox, BS, MS
I'm an engineer. I solve problems.

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