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Re: Apple IIgs 200w Power Supply
Henry wrote:
<snip>
Michael: The only issue with ATX to Apple converter cables would be that
the user would have to make sure the ATX power supply has a -5v supply line.
Most newer ATX supply's have done away with it. That's one of the reasons
it was so hard to find a power supply that would work, the other reason is the
form factor. The supply I'm using is actually a U1 rack-mount supply, but
in a "special" footprint.
I've noticed the demise of -5v, too--but there are still lots of older,
small form factor ATX supplies. For that matter, there are lots of even
older AT supplies, and they all have -5v (but are a little harder to get
in a small form factor). All of these would be great *external* power
supplies, ala Buggy--all they need for the average, non-soldering person
to make them useful with an Apple II is an adapter cable.
<snip>
Okay, math lesson over. ;) I'm not too sure what you mean by "new 200 watt
power supply really heavy power supply?". If you mean the weight, it
actually weights a little less then the original supplies since it's a
"switching" supply and not "linear". A switching supply doesn't need a big
heavy transformer like the older supply's do. They convert the AC from 60
cycles to a much higher frequency which is much more efficient way to
convert power.
Not only is the original Apple II supply also a switching supply, it
was the *first* switching power supply built into a personal computer!
Technology has simply improved the power density in newer supplies.
I'm not too sure about the Vulcan supply's, sorry.
Also switching, and "heavy duty" (about 5v @ 5A, e.g.), and half the
volume of the original Apple power supply (an earlier beneficiary of
improved power density), so that a 3.5" drive could fit in front of it.
-michael
Music synthesis for 8-bit Apple II's!
Home page: http://members.aol.com/MJMahon/
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