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80386 unknown PSU connector

hinibi

New Member
Joined
Jul 20, 2019
Messages
3
Location
Europe
Hello,

I've just find this motherboard, for 80386. Looks nice and all, but the problem is, the PSU connector isn't something I've seen before.
It isn't an old AT psu connector, it has more pins.
s-l1600-2.jpg
s-l1600-3.jpg

connector1.jpg

1) Does anyone know what this connector is ?
2) Is there an adaptator to an AT or even ATX PSU ? or, at least, know what the psu pins are, so I could try to use a standard AT PSU ?
3) Also, there's no reset, hdd, power, ... pins on this board. Strange board...

Weird thing, is this motherboard doesn't have any Brand name, I tried to search all the number on the board without any luck.

Thank you in advance,
Hinibi.
 

KC9UDX

Space Commander
Joined
Jan 27, 2014
Messages
7,468
Location
Lutenblag
1) no
2) you can make one easily enough
3) guess why there are so many power supply pins. :)
 

hinibi

New Member
Joined
Jul 20, 2019
Messages
3
Location
Europe
So, it may be easy, but could you elaborate ?
If I had at least the electric schema.
I tried to search for the plastic connector also, but without a name, it is quite difficult to find.
 

GiGaBiTe

Veteran Member
Joined
Apr 30, 2015
Messages
2,723
Location
Austin, Texas
It's not that difficult to figure out what pin is what voltage. Ground is ... ground, use a multimeter in continuity mode between a mounting screw pad and the pins.

The rest of the voltages are present on the ISA bus, probe between the specified voltage pin and the pins on the weird connector to figure them out. 5V usually has multiple pins because most of the current is sourced from the 5V rail, likewise there are multiple ground pins.

https://upload.wikimedia.org/wikipedia/commons/9/9f/ISA_Bus_pins.svg

The only pin which may be difficult is PWR_GOOD, which is a circuit looking to the PSU for a logic high (5V) for good or not 5V for bad (dodgy PSUs can be not 0V and put out anything between 0-5V.) This pin probably won't resolve to anything, but it still needs the signal from the PSU for the board to turn on. You can feed it 5V directly to force the board on, but it's not a great idea.
 
Last edited:

GiGaBiTe

Veteran Member
Joined
Apr 30, 2015
Messages
2,723
Location
Austin, Texas
Was there some logic on the board that used 3.3v? I didn't think 3.3v was a thing until the Pentium era.

As an addendum to my previous comment, don't put voltage to pins you don't 100% know, you might let the magic blue smoke out.
 

Chuck(G)

25k Member
Joined
Jan 11, 2007
Messages
38,877
Location
Pacific Northwest, USA
Well, the 486DX2s used 3.3V, but no 80386s. I wonder if this isn't simply a PSU fan temperature sensor connection. Should be easy enough to buzz out. Even when HP was using ASUS and FIC motherboards for their later Vectras, all had a PSU fan connector on them.

On some of the P2 and P3 systems, the BIOS looked for the fan connection and refused to boot unless it was connected.
 

Flamin Joe

Experienced Member
Joined
Jul 24, 2013
Messages
176
Location
Brisbane, Australia
I believe this is the Power Supply however there is no picture. 5063-5719 is the HP Part Number.

https://www.impactcomputers.com/5063-5719.html

This may be of interest as well although I don't have a Scribd account to view the full document.

https://www.scribd.com/doc/15124304...-Vectra-PCs-Introduced-before-August-1995-pdf

And I believe this is the motherboard on Stason.org

https://stason.org/TULARC/pc/motherboards/H/HEWLETT-PACKARD-COMPANY-386DX-HP-VECTRA-386-25-PC.html

And here looks to be the power supply pinout

https://allpinouts.org/pinouts/connectors/power_supply/hp-vectra-power-supply-13-pin/

*drops mic* :D
 

hinibi

New Member
Joined
Jul 20, 2019
Messages
3
Location
Europe
*takes the mic*
Yeah, great job in finding those links.
But It's a 19 pins connector, so it ain't that last link.

I've use GigaBite methode (thx) and tried to find the corresponding pins :
1: ?
2: ground
3: ?
4: -5
5: -12
6: +12
7: ground
8: ground
9: ground
10: ground
11: ground
12: no pin
13: +5
14: +5
15: +5
16: +5
17: +5
18: ?
19: ground

So I'm missing 3 pins (there's no pin at position 12). I tried to find continuity of most solder points on the board, without success.

I'll try it like that.

I just need to find a connector that I can use with this board. Been looking a ...lot of connectors.. eyes are tied ... :(
 
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