Re: PAL Colour Card

[david@uow.edu.au (David Wilson)]

Patrick Schaefer <patrick.schaefer@topmail.de> writes:
>David Wilson schrieb:
>> Baseband is usually on RCA or BNC connectors. S-VHS is separate Luminance
>> and Chrominance.

>True. But some S-VHS inputs accept combined video signals on the
>luminance line, e.g. my Sony TV does. 

Thanks - that is useful to know.

>> change the main crystal from 14.31818MHz to a slightly lower 14.???

>14.025 MHz. 
>The same applies to a ][ board. You have to swap the crystal and change
>five solder junctions as described in the Reference Manual.

I think that is 14.25MHz. One line on the Apple 2 is 65 x 14/Clk + 2/Clk
whitch for NTSC works out at 63.5us + .139us = 63.64. For a 14.25MHz clock
this works out at 63.86us + .140us = 64us. 14.025 works out as 64.88+0.142
or 65.02us. When I looked at my PAL //e I found that the crystal is not
marked with a frequency.
--
David Wilson  School of IT & CS, Uni of Wollongong, Australia