Hi Bob,

If you only need single colour charaters you can get 64 in one line across
using from memory a 16c73 running in spec. They are a bit hard to read with
the res of the tv monitor but the quality of the output is spot on.
Lots of tricks involved but worked very well, long time ago I wrote a time
stamp to overlay on video, not sure if I got overlay sync to work but it was
creating its own sync etc.

Let me know if intrested and I will try to dig it up.

regards


Lee McLaren.

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Bob Axtell
Sent: Saturday, 10 July 2004 10:58 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE:] Video overlay question


Look at Mitsubitsi (sp?) MB35060-002SP. But I'm told it is being
dropped, too, available now only in DIP.

I designed the STV5730A into literally thousands of active products.
Yet, not only will ST not manufacture it anymore, they won't license it
so that smaller chip makers can make it, either. I and other designers
have begged ST to continue the product, but to no avail.

Its a serious problem. Phillips has a few products based on the 8051
with a small overlay generator, and one catches glimpses of a Japanese
source here and there; Zilog has some but the characters are much too
big for law enforcement (my application). I was hoping the DSPic would
be capable of doing something, but the PSPic's speed is nowhere near
fast enough to directly write to the screen. Even the Ubicom is too
slow.

Using a FPGA and an LM1881 (timing extractor), an 18F PIC can control
the writing of pixels into an NTSC or PAL screen. Its just a lot of work
and it takes a lot of board space, too.

Let us know what you run across.

--Bob

fred jones wrote:
> Hi all,
> I am interested in overlaying text on a video source.  The STV5730A fits
> the
> bill perfectly.  The only problem is that it is discontinued.  Does anyone
> know of a chip that can be interfaced to a PIC and overlay text on a video
> source like the STV5730A?  I haven't been successful finding one except
for
> the BU5963AS.  Can't find anything on that one except a datasheet...no
> source for it though.  Thanks for any help.
> FJ
>
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         Bob Axtell
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       1-520-219-2363

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