> If you can get the SAA5246 you can do either PAL or NTSC video
> rates (software selectable).
SOunds interesting. The SAA5243 is much easier to find in the UK, I
think.
It is, I've had five 5243s and no 5246s from scrap TV's recently.
How compatible are the 5243 and 5246 in software (as in register bit
allocations, etc). Wildly different?
A couple of extra bits in the registers to set PAL/NTSC and free run (VCO)
and a bit for VCR which was a pin on the 5231.
Also a new register with status bits for sync type (525/625), data quality
and signal quality.
Software for the 5243 should run on the 5246 if you set all the unused bits
as per the data sheet.
It does, it also has the video output drivers on board so needs far fewer
external components.
Adding the SAA5231 to an SAA5243-based display is overkill unless
you
need the genlock capability or you also want to decode teletext
data. A
As all my teletext chips come from scrap TVs I don't bother removing the
5231, only the Safari control processor if it's fitted.
Lee.
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Received on Mon Aug 27 2001 - 19:28:30 BST