Path: utzoo!attcan!uunet!super!udel!rochester!cornell!mailrus!ncar!ames!oliveb!amiga!boing!dale
From: dale@boing.UUCP (Dale Luck)
Newsgroups: comp.sys.amiga
Subject: Re: Bug in decision for PAL or NTSC
Message-ID: <526@boing.UUCP>
Date: 13 Dec 88 18:56:45 GMT
References: <1994@van-bc.UUCP> <1329@rmi.UUCP>
Reply-To: dale@boing.UUCP (Dale Luck)
Organization: Boing, Milpitas, Ca.
Lines: 23

In article <1329@rmi.UUCP> kkaempf@rmi.UUCP (Klaus Kaempf) writes:
>
>By looking at the line frequency at boot-time, the amiga should decide
>whether to display 200 lines (60 Hz, no dma-time for 256 lines) or
>256 lines (50 Hz, no 200 lines please !).

The amiga software does not decide whether to display 200 lines or
256 lines. The particular version of the agnus chip tells us that.
It it NOT coupled to the line frequency.

Also there is no line frequency pin on the A500. The real time
clock get's it's timing from the same circuitry that generates video
syncs. So genlocks have a tendency to really screw the timing of
an a500 if vsync ever strays from 60/50 hz.
>
>Still puzzled,
>
>Klaus


-- 
Dale Luck     GfxBase/Boing, Inc.
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