From: Bo Zimmerman (bo_at_zimmers.net)
Date: 2005-08-03 19:09:06
Heh, yes, it was strange that there were no ill effects from tying the
power-on to the wrong line. It was even stranger that, other than that
weird floating voltage, the power supply turned on and worked just fine that
way.
Obviously, I did find the correct setting (ground instead of +5) to turn the
power supply on and keep the voltage steady.
However, it was to no avail. I got no video signal from the computer. I
had it hooked up to a 1084 (in rgbi mode of course).
I'm at a loss as to where to go next. The only doubt I have in my mind
about the new power arrangement is whether I properly measured that odd
+2.5V line. Could someone with a C900 find out what the correct voltage on
the "brown" line is? Or, failing that, what the correct voltage on the
"brown" line of a CBM-II machine is (610, b128, etc)? Perhaps I measured
wrong?
- Bo
> -----Original Message-----
> From: owner-cbm-hackers@ling.gu.se
> [mailto:owner-cbm-hackers@ling.gu.se] On Behalf Of Marko Mäkelä
> Sent: Wednesday, August 03, 2005 3:39 AM
> To: cbm-hackers@ling.gu.se
> Subject: Re: C900 and ATX Power Supplies...
>
>
> On Wed, Aug 03, 2005 at 03:01:59AM -0500, Bo Zimmerman wrote:
> > The only thing I'm doing strangely when the ps is not under load is
> > that I cross the always-on 5V line on the ATX with the
> Power-On line
> > on the ATX to force the power supply to come on. I
> suspect, perhaps,
> > that this might have been the wrong thing to do.
>
> I think it is unlikely to cause any permanent damage, unless
> your power supply is a very cheap one made by some no-name
> manufacturer.
>
> I accidentally shorted the +5V supply of my DVB-T recorder box
> (http://www.cadsoft.de/vdr/) to ground when developing a
> power-on-by-remote circuit
> (http://www.funet.fi/~msmakela/electronics/worc5/). The
> power supply shut itself down and refused to start within a
> few seconds. The next day, I opened the power supply, and
> the internal 10-amp fuse on the mains side was not blown. I
> soldered the fuse back in place, and the computer worked just
> fine with this power supply. It must have been some
> overheating protection.
>
> Have you tried adding a hard disk as an extra load to the
> power supply?
>
> Marko
>
> Message was sent through the cbm-hackers mailing list
>
Message was sent through the cbm-hackers mailing list
Archive generated by hypermail pre-2.1.8.