Re: Monitor cable

On 26 Jul 2005 Theo Markettos <theom+news@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> Jules <julesrichardsonuk@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> > The OP did state the following though:
> >
> > Video signal: Analogue
> > Amplitude: 0 to 0.7V
> >
> > ... for the mono monitor spec. Certainly the R140 manuals just say to run
> > two BNC cables between the machine and high-res monitor, implying that the
> > R140's output at least is also an analogue signal, 0.7V.
>
> Good point - I misread that as the AKF85 spec. Though on the A440 it's 5V
> switched through a 2N3904 transistor which is then divided in half, so
> becomes half TTL at 0 to 2.5V.

But the AKF85 only takes 0.7V and 1.0V, so would not like a 2.5V bi-level
display. Best shove a resistor in there to stop the phosphors burning a hole
in the back of your retinas.

> I doubt the monitor would blow up if connected to too high voltage levels
> anyway.

I wouldn't like to bet on that.

> > I have a feeling not all VGA screens will handle composite sync though
> > - I thought that was generally only on the higher spec models (as PC
> > video output uses seperate syncs, so they don't put the sync splitter
> > circuitry in low-end displays in order to keep costs down)
>
> You might be right there. The AKF85 has BNC sockets, right? So try just
> wiring VIDEO to green and SYNC to HSYNC with BNC leads and see what
> happens. (I can't remember if it has separate hsync/vsync sockets or not.)
> If it's working the LCD will show the resolution and frame rate.

It has seperate V, and a H/H+V.

---druck

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