Glad to help!
-Chris
On Sun, 12 Jan 2003, Kroko wrote:
> Thanks a lot, I am an idiot, I forgot the pullup, ....
> It works now :-)
>
> Kroko
>
> ----- Original Message -----
> From: "Chris Wilkson" <ecwilkso@xxxxxxx>
> To: <stella@xxxxxxxxxxx>
> Sent: Sunday, January 12, 2003 10:50 AM
> Subject: Re: [stella] Chip Select Line
>
>
> > Is the 7407 inverting or non inverting? I think it's non-inverting, which
> > is what you'd need. But it definitely has open collector outputs. Did
> you
> > use pullup resistors on the outputs? It won't work without connecting a
> > pullup resistor from the output to VCC.
> >
> > -Chris
> >
> > On Thu, 9 Jan 2003, Kroko wrote:
> >
> > > Hello !
> > >
> > > I have made a little testing with an original PacMan ROM chip.
> > > I made all the lines available for measuring the signals.
> > >
> > > If I connect all lines to the PacMan ROM, as in the original cartridge,
> > > everything works fine.
> > >
> > > What I did now is, that I connected the A12 line to an 7407 buffer and
> from the
> > > output of that buffer back to the CS line o the ROM. It is not
> inverting, so it
> > > should work. But it doesn't. Why not ?
> > >
> > > What are the timing requirements for the A12 line ? What am I missing ?
> > > It should work, shouldn't it ?
> > >
> > > Kroko.
> > >
> > >
> > >
> > >
> > >
> >
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