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PICList Thread
'Video character generators'
1997\03\17@193830 by Mailing List Account

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       I need to output characters to a TV using a PIC, I want to use
an external IC.  What types of ICs are available to do this, where can I
get them, what features do they have, and how hard is it to get the first
character on the screen?

                                               Thanks,
                                               Phil

1997\03\17@203628 by Customized Controller Solutions

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       Try the LM1889.  I think that is the correct part number for
modulation on CH 3 VHF.  You can get them nearly anywhere(Not Radio
Shack) that has the ECG line or the NTE line of parts.

A good book for the principles involved in this type of a project is:

"The cheap video cookbook"  by Don Lancaster

I just searched for the proper name of the above book.  No luck finding
it at:

Don Lancaster's Home Page
http://www.tinaja.com/

At 04:36 PM 3/17/97 -0800, you wrote:
>        I need to output characters to a TV using a PIC, I want to use
>an external IC.  What types of ICs are available to do this, where can I
>get them, what features do they have, and how hard is it to get the first
>character on the screen?
>
>                                                Thanks,
>                                                Phil
>

1997\03\18@021450 by Dominic Peterson

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Customized Controller Solutions <spam_OUTccslistTakeThisOuTspamEWOL.COM> wrote:
{Quote hidden}

Try searching on "on screen display" or "OSD" with companies like Philips,
Toshiba etc.  This should find you some of the self-contained display chips
that are used to put programming info on TV screens for VCR's etc.  Example
part numbers (Philips) are PCA8514/15/16.  These are 24-pin devices that
are intended for serial interface to a micro and do all character generation
etc in colour plus support genlocking for overlay onto an existing video
signal. How much?  Don't know - not even sure if you can buy them in one's.
The data sheets mention various "mask options" which implies LARGE order
quantities.  However, I would assume these are used in Philips VCR's so they
may be available as spare parts.  This is on my "List of things to follow up
when I have time" - the list is getting longer every day :-)

BTW - The "Cheap Video Cookbook" and "Son of Cheap Video" by Don Lancaster
make interesting reading but more in teh historical sense.  They present
schemes for generating video by tapping directly into the address and data
busses of a microprocessor system (most of the examples are 6502 based
KIM-1's - ie late 1970's).  These sort of techniques are obviously
impossible in a Harvard architecture like the PIC and probably unneccesary
when OSD chips and the like are available.  Just my opinion of course :-)

Good luck - hope this info is helpful.

Best regards,

Dominic

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Dominic Peterson                           Email: .....d.petersonKILLspamspam@spam@qut.edu.au
Systems Analyst                               Ph: +61 (07) 3864 4286
Queensland University of Technology          Fax: +61 (07) 3864 4490
Brisbane, Australia

"Dominic is a fool and his views not only don't represent those of QUT
or any of it's employees, but furthermore we refuse to admit he even
works for the University, let alone that he knows anything relevant.
Don't trust him and don't lend him money."

1997\03\18@064015 by Harrison Cooper

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isn't it intersting when you see a topic and you say "I just saw
something in a trade journal...."

OK...ECN Feb  (so I am behind in my reading), "single chip Video decoder
for teletext and intercast"  VPX 3225D by ITT Inermetall in Germany

overview...

44 PLCC, aquires and displays various data standards including
VPS,CC,NABTS (intercast) and WST teletext

may not do what you want....but just passing the info along.  If anyone
wants, I could scan the text on it and post as a .jpg file

1997\03\18@071305 by Antti Lukats

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At 04:38 AM 18/3/97 -0700, you wrote:
>isn't it intersting when you see a topic and you say "I just saw
>something in a trade journal...."
>
>OK...ECN Feb  (so I am behind in my reading), "single chip Video decoder
>for teletext and intercast"  VPX 3225D by ITT Inermetall in Germany

have you ever tried to get any of the ITT chips (except from inside TV-set)?
they make lotsa stuff but I have never succeeded in getting any of the :(.

antti

-- Silicon Studio Ltd.
-- http://www.sistudio.com

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