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Apple IIe Master Clock [message #373395]

Fri, 07 September 2018 22:57

Anonymous

Karma:

Originally posted by: cb meeks

I've read in a few places (including "Apple II Circuit Description") that the master clock of the Apple II is 14.31818 MHz. Which makes sense as that's an even multiple of the NTSC colorburst.

However, I'm looking on my new Apple IIe board and the only clock I see is 14.31863. Not terribly off but definitely not equal.

What was the reasoning behind this difference? Was this just a IIe thing to support the newer graphics over the II and II+?

Thanks

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Re: Apple IIe Master Clock [message #373407 is a reply to message #373395]

Sat, 08 September 2018 10:47

Anonymous

Karma:

Originally posted by: frank_o_rama

It "should" be 14.31818 but the "Apple II Level 2 Service Manual" has references to both frequencies. Might be why my ][+ is so picky about monitors (the 14.31863 crystal would produce a slightly-off video frequency).

https://archive.org/details/Apple2Level2ServiceMan1981

f

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