Re: Cinematronics > Atari Adapter???

Ahhhh.... See there's the other half of the problem - I'm not good
enough by half to understand this to start researching it.

I just imagined that seeing that no-one responded to the 'who repairs
Cine boards' question in the last week or so, that people might want one
even if only to be able to hook the outputs to a scope to test their
boards.

Seeing as we already have that schematic (from Space Fortress that uses
the DAC80s), I was going to get a price on getting a couple of PCB's
made.

This was all brought up in my mind again because I am having another
shot at getting my Cinematronics project up - found another monitor
(covered in dirt but a later model than the Space Wars one I previously
had. I'm expecting failure but I'll keep working on it tonight.

Cheers
MacMan

On Monday, October 14, 2002, at 01:20 AM, Tom McClintock wrote:

> Wait, here are some notes from Zonn.
>
> ------------------
> Your biggest problem with doing a Cine->WG board is
> that you are forced to use 12 bit parallel DACs, which
> are expensive. The Cine design is pretty much going to
> force you to find ~1 to 2 us settling time parts. (To
> keep the frame rate up, we had to do the same.)
>
> Though you might be able to save some money by using
> single supply 12 bit DACs and shifting the voltage
> after the analog switch / RC stuff. This is the
> approach we took in the ZVG. This also allows the use
> of the much more available and less expensive 74HC4066
> switches which are only single polarity switches. The
> LF13331 were bi-polar, and also expensive (when they
> were available).
>
> You can't use serial DACs. They would require a
> parallel to serial conversion and there is no time
> allocated in the hardware to allow this. The DACs are
> latched and the Z-axis is turned on for the draw,
> there's no "clock data into DACs" time, which at
> minimum would take 16 clock cycles, if both DACs were
> simultaneously clocked.
> -------------------------------
>
>
> Beyond that, lemme know if you come up with something :)
>
>
> tm
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Received on Sun Oct 13 12:48:58 2002