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PICList Thread
'Video Overlay'
1999\03\22@181502 by Kevin

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I have a question for you Pic wizards,  How can I display text
on a monitor and /or TV.

Is there a single chip hardware interface or somewhat easy
interface to implement for overlay onto a Monitor???

KD

1999\03\23@002148 by Graeme Smith

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GRAEME SMITH                         email: spam_OUTgrysmithTakeThisOuTspamfreenet.edmonton.ab.ca
YMCA Edmonton

Address has changed with little warning!
(I moved across the hall! :) )

Email will remain constant... at least for now.


On Mon, 22 Mar 1999, Kevin wrote:

> I have a question for you Pic wizards,  How can I display text
> on a monitor and /or TV.
>

It depends on the Monitor, or T.V.

Perhaps the easiest application, is the one used for Monochrome monitors
such as  the old green, or amber screens that everyone is dumping in the
dump these days.

A Hercules card, I slightly disremember, had a graphics buffer, that
contained an image of the whole screen, one bit per pixel. This was
then read out to the screen, using a serial shift register one byte
at a time, and the sync signals added in extra....

I remember it, because the shift register had a bad pin, and I replaced it
to see if I could get it to work.... That didn't work because the
character generator rom, which was used to print the character into the
screen buffer in its graphics form, had a bad pin on it too. When I
transferred the character generator rom, to a new eprom, all the problems
went away....

Your mileage may vary ;)

                               Grey

1999\03\23@093900 by Shawn Rich

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> I have a question for you Pic wizards,  How can I display text
> on a monitor and /or TV.
>
> Is there a single chip hardware interface or somewhat easy
> interface to implement for overlay onto a Monitor???
>

Wirz Electronics has product that seems like it might work for you.
Haven't used it myself; just ran across it in my searching for pic
info--still at the blinking LED stage.


http://www.wirz.com/video/index.html



shawn

1999\03\23@173906 by efan Sayer

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Hi Kevin,

> I have a question for you Pic wizards,  How can I display text
> on a monitor and /or TV.
>
> Is there a single chip hardware interface or somewhat easy
> interface to implement for overlay onto a Monitor???
>
> KD

See  http://www.efd.lth.se/~e96rg/pic.html ; this guy is using an
overclocked (12 MHz ?) PIC16F84 do drive a pal TV directly (?) and as I
remember he's also doing some text display.

Stefan Sayer

1999\03\24@002336 by Kevin

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Well I hooked it up.  There is something on the screen, but its not in sync
there are dots all over the screen.  I have tried the PIC Dream
also with similar results.  I have never worked with video so I
really dont know how to correct the problem.

Anyone have any Ideas???

Kevin



>See  http://www.efd.lth.se/~e96rg/pic.html ; this guy is using an
>overclocked (12 MHz ?) PIC16F84 do drive a pal TV directly (?) and as I
>remember he's also doing some text display.
>
>Stefan Sayer

1999\03\24@034457 by Graeme Smith

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face
GRAEME SMITH                         email: .....grysmithKILLspamspam@spam@freenet.edmonton.ab.ca
YMCA Edmonton

Address has changed with little warning!
(I moved across the hall! :) )

Email will remain constant... at least for now.


On Wed, 24 Mar 1999, Kevin wrote:

> Well I hooked it up.  There is something on the screen, but its not in sync
> there are dots all over the screen.  I have tried the PIC Dream
> also with similar results.  I have never worked with video so I
> really dont know how to correct the problem.
>
> Anyone have any Ideas???
>

Probably not a PAL t.v.

NTSC maybe?

remember there are competing standards Europe uses one, Ahem.... America
uses another. Gotta watch the assumptions.



                               Grey

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