Subject: Re: What's the IIe's--Arghh!--MHz Speed?
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From: Patrick Schaefer <pa.schaefer@fz-juelich.de>
Newsgroups: comp.sys.apple2
Date: Mon, 25 Jan 1999 14:06:44 +0100
Organization: Forschungszentrum Juelich GmbH
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Kent Dickey wrote:

> The nominal 1MHz clock is derived from a base crystal 14MHz = 14318180.

...unless you live in Europe. The ][europlus versions have a main
oscillator with 14.025xxx MHz, therefore our machines are a little
slower. This was required to get the 50Hz timing for PAL tv.

The complete video timing (with the stretched 65th cycle) is described
in 'Apple II circuit description' by Winston D. Gayler, Sam's; or in the
German version published by Pandabooks.


Patrick