Re: PAL Colour Card

[pausch@saafNOSPAM.se (Paul Schlyter)]

In article <39A4D3E2.C625839F@topmail.de>,
Patrick Schaefer  <patrick.schaefer@topmail.de> wrote:
 
> David Wilson schrieb:
> 
>> 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.
> 
> Your memory ist better than mine :-)
> It is 14.250450 MHz. 64 us gives the correct line length for (at least
> the European) PAL.
 
64 us gives the correct line length for European SECAM as well as
European B&W.  And even European NTSC -- the latter was never widely
used, but before PAL and SECAM became the stadard color TV systems in
Europe, there were some experimental transmissions in a 625-line
variety of NTSC.
 
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