From: Bo Zimmerman (bo_at_zimmers.net)
Date: 2005-08-04 06:11:23
Hmm.. if its some sort of signal that fluxuates between something low and
5v, that explains why I read it on my digital multimeter as 2.5v.
I feel like a dummy.
Thanks a million William. Now to find out if the atx ps has a similar
signal I can use...
- Bo
> -----Original Message-----
> From: owner-cbm-hackers@ling.gu.se
> [mailto:owner-cbm-hackers@ling.gu.se] On Behalf Of William Levak
> Sent: Wednesday, August 03, 2005 10:16 PM
> To: cbm-hackers@ling.gu.se
> Subject: RE: C900 and ATX Power Supplies...
>
>
> On Wed, 3 Aug 2005, Bo Zimmerman wrote:
>
> > 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?
>
> I don't see a 2.5V line on the CBM-II schematic. There is
> +12V, -12V,
> *5V, ground, and something labeled 50/60 Hz. This last is inverted,
> pulled up to +5V and fed to IRQ0 on the 6525, and TOD on the 6526.
>
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>
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