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From: stever@videovax.UUCP (Steven E. Rice, P.E.)
Newsgroups: net.micro.amiga
Subject: Re: HELP. PAL Amiga is available ??
Message-ID: <1969@videovax.UUCP>
Date: Tue, 30-Sep-86 19:41:28 EDT
Article-I.D.: videovax.1969
Posted: Tue Sep 30 19:41:28 1986
Date-Received: Sat, 4-Oct-86 04:46:29 EDT
References: <5489@decwrl.DEC.COM> <786@cbmvax.cbmvax.cbm.UUCP>
Reply-To: stever@videovax.UUCP (Steven E. Rice, P.E.)
Organization: Tektronix, Comm Group, TV R&D
Lines: 30

In article <786@cbmvax.cbmvax.cbm.UUCP>, Jeff Porter (porter@cbmvax.UUCP)
writes:

> As it turns out, Brazil has a COMPOSITE video signal with PAL syncs
> and NTSC color burst.  This is what the first Amigas in Europe have.
> . . .

Whoa!!!!!  Brazil uses PAL-M, which is 525 lines per frame, 30 frames per
second, 2:1 interlace (60 fields per second), with a nominal luminance
bandwidth of 4.2 MHz.  The monochrome PAL-M signal is identical with a
monochrome NTSC signal (this includes sync. . .).  And, of course, if
the monochrome PAL-M signal is compatible with NTSC, it is (by definition)
incompatible with European PAL!

The chrominance (color) component of a PAL-M signal is similar, but not
identical, to the various European versions of PAL.  One difference is
that the PAL-M chrominance subcarrier frequency is 3.57561149 MHz, while
the various European PAL standards use a 4.43361875 MHz subcarrier.
Another difference is that European PAL has a 25 Hz subcarrier offset
that causes the reference chrominance phase to rotate through 360 degrees
in each frame.  PAL-M has no such offset.

If the Amigas being sold in Europe really do conform to the Brazilian
standard (PAL-M), they are totally incompatible with European television
sets.  I hope this is not the case. . .

					Steve Rice

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