From: William Levak (wlevak_at_grex.cyberspace.org)
Date: 2005-08-04 05:15:56
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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