PC refuses to boot

In comp.sys.ibm.pc.hardware.chips keith <krw.TakeThisOut@att.bizzzz> wrote:
 > Good resistors are hard to find (lightbulbs are *lousey*
 > resistors)

If you consider "good"==constant. I was using "good"==disippates
lots of heat.

 > Huh? UL is all about safety. They could care less about
 > utility. What's TuV?

TuV is the rough German equivalent to UL. Both will test or
requires PSUs to be tested at full wattage for long enough
to heat up to show they don't catch fire. Voltage might
sag, but that's more likely to cause overheating, too.

 > Sure, but a dynamic test shouldn't be too hard. A few
 > resistors and FETs should do it. I believe the reason

Yep, those'll work.

 > it's not done is that PSU's are Boorrringgg. THey don't
 > make games go faster, rather can only bring them to a halt.
 > "If it works, it's good!"

Agreed.

 > Ok... Why not slew the HLT? (oops!)

That takes brains

-- Robert<!-- ~MESSAGE_AFTER~ -->

In comp.sys.ibm.pc.hardware.chips The little lost angel <a?n?g?e?l@lovergirl.lrigrevol.moc.com> wrote:
 > Hmm, we started with static loads and light bulbs but I
 > eventually ended up with a dynamic design that was supposed
 > to change loads in 20Khz speeds. Not sure if this is enough
 > to qualify for your dynamic definition. Though my friend

This is definitely dynamic, and in the right range.
I think mobos switch around 100 kHz, and the PSUs are
considerably slower.

 > helping me do the construction looked quite dimly upon the
 > idea... largely due to the cost and the fact neither of

I want to use software only. CPU as power load.

 > As a side trip, from your experience, is it possible to
 > shutdown the clocks to the processor on a P4 (or AhtlonXP
 > since I'm at it) via software instructions that be done

"HLT" as implemented in most idle threads is about
as low as I know going, although some mobile CPUs
(really mobos) have more severe measures (downclock
and down volt, ie. Intel SpeedStep).

 > with a very simple DOS based program? I'm trying to do a
 > reverse of your burning the cpu and trying to freeze it
 > instead :ppPpP

A two byte MS-DOS pgm will work CLI / HLT, but for
AMD, the Northbridge StopGrant bit has to be enabled.
Both instructions are priviliged, and run only in Ring0.
For the P4, you can do BACK:REP NOP / JMP BACK.
I haven't measured REP NOP vs HLT.

-- Robert<!-- ~MESSAGE_AFTER~ -->