JIM HOLSONBACK wrote in a message to WAYNE CHIRNSIDE:

 JH> The SFX don't provide -5V power, so can't fully support ISA bus.

Now *that* is an interesting tidbit...

 JH> Some of the micro-ATX boards do have one or more ISA slots, but 
 JH> looks like the absence of -5V isn't really a problem - the only
 JH> reference I saw for ISA cards using -5V was some of the "older"
 JH> floppy drive controller cards.

I wasn't aware of that either,  about the only thing I know of that uses -5
is some very early ram chips.  But then it's been a pretty long while since
I looked at the data sheets for any of those floppy controller chips. 




 JH> These PS are smaller than standard ATX, and use three screws to
 JH> attach to the case -  looking from back of box, two on the left and
 JH> one on the right.

Got one little one here,  not sure if it fits this description or not but
probably not,  since I got it out of a P-B that was getting tossed. 
Looking at the rear of it there's two screw holes at the top,  one on the
bottom right,  but there are also metal tabs on the bottom which is how I
think it probably mounted.

 JH> There are two standard variants - on one, the cooling fan is inside
 JH> the PS case, and those are 63.5mm H, 100mm W, and 125MM D (depth
 JH> into the case). The other is same W and D, but main box of the PS
 JH> is only 60.5mm high.  Screw holes are on same centers for both. 
 JH> The 60.5 mm high units are recognizable because they have a 90mm
 JH> cooling fan mounted on top of the case, protruding perhaps 1/2"
 JH> higher than the main part of the case.

This one definitely doesn't fit those dimensions,  it's about 70mm or
slightly more high,  about 105mm wide,  and about 155mm deep,  excluding
the bit of metal that protrudes around the power switch actuator about
another 20mm,  on the same side where the wires come out.  This one also
has a fan that seems to protrude a bit at the back of the case,  that part
being about 50mm in diameter.  The actual fan diameter when I open the unit
up and pull the fan out seems to be closer to 60mm.

I harp on the fan here because it's not working.  At all.  As this is a
handy little supply,  useful for bench testing and such,  I'd like to keep
it going. As it is,  I have to be real careful how long I run it and what
all I plug into it.  Perhaps at some point if you run across such a fan in
the stuff that you deal with we could work something out?  At any rate,  so
far so good...  :-)



 JH> As Tom Walker posted, some of these PS are only rated for 100 watts
 JH> or so. 

That's how this one is rated.  But stuff I'd hook up to it sure doesn't eat
power like the old stuff did...

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