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: firstname.lastname@example.org > [mailto:email@example.com] On Behalf Of Marko Mäkelä > Sent: Wednesday, August 03, 2005 3:39 AM > To: firstname.lastname@example.org > 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
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