Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cbmvax!rsbx
From: rsbx@cbmvax.commodore.com (Raymond S. Brand)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: What is the most correct way to determine CIA frequencies?
Message-ID: <19099@cbmvax.commodore.com>
Date: 19 Feb 91 05:11:37 GMT
References: <1991Feb7.024621.10770@phoenix.pub.uu.oz.au>
Organization: Commodore-Amiga Inc, West Chester, PA
Lines: 23

In article <1991Feb7.024621.10770@phoenix.pub.uu.oz.au>, bytey@phoenix.pub.uu.oz.au (Chris Hames [bytey]) writes:
> 
>     I am allocating TimerB or TimerA(if B is unavailable) of CIAB and
> would like to know the correct way to find out if the clock is
>     .709379Mhz  PAL
> or  .715909Mhz  NTSC

When running under 2.0 or later, use the timer.device ReadEClock() result.
When running under 1.3 and previous, determine the configuration (PAL/NTSC) of
the machine by looking in GfxBase->foo (I don't remember, look it up).

NOTE: Some Amigas (A3000s and the like) have a jumper to indicate to graphics
the PAL/NTSC state of the machine; this jumper does NOT affect the EClock
frequency, only what we ASSUME it is.

						rsbx

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