14 Dec
2001
14 Dec
'01
9:28 p.m.
On Dec 14, 16:16, Douglas Quebbeman wrote:
In particular, do any of you have familiarity with
systems that flash the on or power light as an
indicattor, sopecifiecally, of a power supply
problem?
The only thing I can think of that's *designed* to do something like that
is an SGI Indy; if you power one up and it can't even run the the code in
the PROM, it flashes the power light (which is a two-colour LED). The
usual cause id that there's no (recognisable) RAM at all in it. Probably
not relevant to a PR1ME.
Even less relevant, but in the same vein, is an Acorn Archimedes. If it
can't boot, and can't set up the display, it flashes a 4-bit fault code on
the floppy access LED. However, the code is RISC OS-specific.
Would anyone venture what a 2 Hz flash rate on the ON
LED of a Prime might mean?
If it's a short "on" and a long "off", it might be a power supply
that is
starting up , detecting a problem, and shutting off again. And retrying,
and ... Is there any accompanying, possibly fairly quiet,
whistle/buzz/click that occurs at the same rate?
--
Pete Peter Turnbull
Network Manager
University of York
15 Dec
15 Dec
12:06 a.m.
On Dec 14, 16:16, Douglas Quebbeman wrote:
Amiga's do it as well when the machine GURU's, just before
the red error message appears.
Jeff
--
Home of the TRS-80 Model 2000 FAQ File
http://www.cchaven.com
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In particular, do any of you have familiarity
with
systems that flash the on or power light as an
indicattor, sopecifiecally, of a power supply
problem?
The only thing I can think of that's *designed* to do something like that
is an SGI Indy; if you power one up and it can't even run the the code in
the PROM, it flashes the power light (which is a two-colour LED). The
usual cause id that there's no (recognisable) RAM at all in it. Probably
not relevant to a PR1ME. 
5:49 a.m.
Hi,
On Sat, 15 Dec 2001, Pete Turnbull wrote:
On Dec 14, 16:16, Douglas Quebbeman wrote:
In particular, do any of you have familiarity
with
systems that flash the on or power light as an
indicattor, sopecifiecally, of a power supply
problem?
The only thing I can think of that's *designed* to do something like that
is an SGI Indy; if you power one up and it can't even run the the code in
the PROM, it flashes the power light (which is a two-colour LED). The
usual cause id that there's no (recognisable) RAM at all in it. Probably
not relevant to a PR1ME. From what I've noticed, the SparcStation 1 flashes
it's power LED when
doing a selftest, but I'm not near the box, so I
can't check :&)
And as Jeff said - Amigas flash the power LED. The flash is between low
and high intensity, and it's actually an indication of the status of the
audio filter :&) IIRC, bright is off and dimmer is on. And yes, it flashes
before you get a Guru Meditation (kickstart 1.3 and below) or Software
Failure (kickstart 2+). Gives you a chance to press right mouse button and
fire up ROMwhack :&)
-- Matt
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10:11 a.m.
And as Jeff said - Amigas flash the power LED. The
flash is between low
and high intensity, and it's actually an indication of the status of the
audio filter :&) IIRC, bright is off and dimmer is on. And yes, it flashes
before you get a Guru Meditation (kickstart 1.3 and below) or Software
Failure (kickstart 2+). Gives you a chance to press right mouse button and
fire up ROMwhack :&)
I knew that while running some applications such as GMPlay
that the LED would dim but I was never sure why. That's a good thing
to know. You're right though that it's not a GURU for KS 2+, but a
software failure. I tend to describe any error which brings up the
red box error as a GURU though. It gives you little option other
than pressing the mouse button and rebooting.
Jeff
--
Home of the TRS-80 Model 2000 FAQ File
http://www.cchaven.com
http://www.geocities.com/siliconvalley/lakes/6757
25 Dec
25 Dec
6:30 a.m.
--- Jeff Hellige <jhellige(a)earthlink.net> wrote:
>And as Jeff said - Amigas flash the power LED. The
flash is between low
>and high intensity, and it's actually an indication of the status of the
>audio filter :&) IIRC, bright is off and dimmer is on.
I don't think it's attached to the audio filter on an A1000, but I
could be misremembering. I think they wanted an extra bit and didn't
want to make any of the I/O incompatible when they added a feature.
> And yes, it flashes before you get a Guru
Meditation (kickstart 1.3 and
> below) or Software Failure (kickstart 2+). Gives you a chance to press
> right mouse button and fire up ROMwhack :&)
Exactly. I remember a sinking feeling in my stomach when the machine
would freeze and the light would slowly blink before revealing the
obvious.
I knew that while running some applications such as
GMPlay
that the LED would dim but I was never sure why. That's a good thing
to know. You're right though that it's not a GURU for KS 2+, but a
software failure. I tend to describe any error which brings up the
red box error as a GURU though. It gives you little option other
than pressing the mouse button and rebooting.
Little option as a user, yes. As a developer, sometimes you could
wring some idea of what just happened out of ROMwhack. GOMF was better,
though (because you didn't have to crash and lose and diagnostic messages),
as was a little wedge in the Guru routine that would translate the Guru
numbers into plaintext inside a *huge* red blinky box. I forget what it
was called, but it was handy because it saved much time when diagnosing
what stupid thing you'd done in the code.
-ethan
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6:34 a.m.
--- Matt London <matt(a)knm.yi.org> wrote:
And as Jeff said - Amigas flash the power LED. The
flash is between low
and high intensity...
I just remembered - I think there was a library for issuing kernel-level
debug messages as morse code over the power LED (since you don't always
have a context that allows file or textual I/O).
-ethan
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15 Dec
15 Dec
7:07 a.m.
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