[rescue] HP 9000 712/* power supply?

[Michael Dombrowski]

 I'll write up a post on VCF forums eventually, but I got around to testing this. I have a PicoPSU with the appropriate outputs and re-pinned a $5 ATX-AT adapter. Once I tied Pin 1 to 5v, the system started right up. 
I'll try wiring it to the ATX power good signals once I get back from vacation and report back
mike


    On Saturday, June 7, 2025 at 10:12:22 AM CDT, Maciej W. Rozycki via rescue <rescue at sunhelp.org> wrote:  
 
 On Fri, 6 Jun 2025, Mouse via rescue wrote:

> > the =
> > power supply stuff is in 7-1, also a small bit about the =
> > START_PWR_DOWN_L signal.
> 
> I saw that.  I may experiment if I can't find anything more definitive.
> As long as the board is happy with nothing driving either pin, I should
> be OK.  If it doesn't work, I'll try pulling the pins to various
> voltages with 1K or so resistors....

 The description implies START_PWR_DOWN_L is an input to the motherboard 
while POWER_ON_L is an input to the PSU.  So you should be able to leave 
POWER_ON_L unconnected while driving START_PWR_DOWN_L high at whatever 
logic voltage level is used there for the system to operate normally.

 No experience with said system here, it's just what I infer from the doc.

  Maciej

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