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From: RobertB on 10 Aug 2010 02:45
On Aug 4, 9:08 pm, joecommodore <la...(a)portcommodore.com> wrote:

> The display in the educator 64 seems quite different than a PET/CBM
> display (yeah, I got both types of computers computers), I think it
> uses composite where the PET/CBM uses a ttl video input for one
> thing.

I asked Ray Carlsen about that, and here is my
question and his response --

> Was the greenscreen that it originally used a
> composite, or was it TTL...?

It was composite, to match the output of the C64
as was the original green tube. Actually, the tube
itself could do either. It's the circuitry that decodes
whatever signal is provided and the resulting
signals are sent to the tube. The only difference in
green tubes for composite or TTL is the screen
phosphor they use, specifically the persistence of
it. A long persistence phosphor looks good on a
static image but would smear on a moving image
such as video from a TV. A short persistence
would show flicker unless a suitable refresh
prevented it.

(snip)

Back from Las Vegas,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcug
The Other Group of Amigoids
http://www.calweb.com/~rabel1/
Southern California Commodore & Amiga Network
http://www.sccaners.org
From: PK on 10 Aug 2010 06:34
Il 10/08/2010 8.45, RobertB ha scritto:

>
> I asked Ray Carlsen about that, and here is my
> question and his response --
>


I adore these kind of messages.
Thank you Robert


--




//
\\//http://sites.google.com/site/retrolabels
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