ATX conversion

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paak

Just picked up a cheap PIII-933 and Compaq motherboard. No PSU in the case
and the mobo takes a 24pin PSU....

Curious if anyone has had any success modding a regular ATX power supply
(v1.3 - 20pin) to a 24pin motherboard. Yes the board works with just the 20
pin plugged in, but has basically no power management features(i.e. have to
turn off the computer with the psu instead of the power switch on the case)

I *could* go purchase a new psu or a 20-to-24pin adapter....but I'm
stubborn...haha....want to mod myself.

If anyone has any resources as to where I may get some info on the subject,
that would be greatly appreciated :)
 
paak said:
Just picked up a cheap PIII-933 and Compaq motherboard. No PSU in the case
and the mobo takes a 24pin PSU....

Curious if anyone has had any success modding a regular ATX power supply
(v1.3 - 20pin) to a 24pin motherboard. Yes the board works with just the
20
pin plugged in, but has basically no power management features(i.e. have
to
turn off the computer with the psu instead of the power switch on the
case)

I *could* go purchase a new psu or a 20-to-24pin adapter....but I'm
stubborn...haha....want to mod myself.

If anyone has any resources as to where I may get some info on the
subject,
that would be greatly appreciated :)
Click to expand...

the adaptor costs about $8 or so...
the parts needed to build one cost about $8.50

i'd probably just do without the power-off feature
 
paak said:
Just picked up a cheap PIII-933 and Compaq motherboard. No PSU in the case
and the mobo takes a 24pin PSU....

Curious if anyone has had any success modding a regular ATX power supply
(v1.3 - 20pin) to a 24pin motherboard. Yes the board works with just the
20
pin plugged in, but has basically no power management features(i.e. have
to
turn off the computer with the psu instead of the power switch on the
case)

I *could* go purchase a new psu or a 20-to-24pin adapter....but I'm
stubborn...haha....want to mod myself.

If anyone has any resources as to where I may get some info on the
subject,
that would be greatly appreciated :)
Click to expand...

Well there's a bit more to it than that as all NEW Intel boards use 24 pin
ATX 2.1 compliant PSU's and the extra 4 pins have nothing to do with power
on and off and Dual Zeon boards have used this for ages. ASUS TEK also say
you can use a 20 pin ATX PSU on their 915 and 925 chipset boards which we do
regularly and they have no problem. Any way what I suspect the problem with
the Compaq is that although it is ATX it most likely uses a PSU with a power
switch fixed to it, this has been common on quite a few Compaq machines and
means you have to buy a PSU through them. The mainboard will certainly be
built for them and them alone, to their specs.


--
Chris
Technical director CKCCOMPUSCRIPT
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Just checked the pinout from the compaq manual(what a pain to find on their
site!!)... appears a few pins are different from the ATX standard(FanOFF
instead of PowerON - pin8)


standard compaq Pins standard compaq
 
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