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From: robinson@renoir.Berkeley.EDU (Michael Robinson)
Newsgroups: comp.sys.amiga
Subject: Composite circuitry fix?
Message-ID: <19939@ucbvax.BERKELEY.EDU>
Date: Mon, 3-Aug-87 16:20:52 EDT
Article-I.D.: ucbvax.19939
Posted: Mon Aug  3 16:20:52 1987
Date-Received: Tue, 4-Aug-87 05:05:44 EDT
Sender: usenet@ucbvax.BERKELEY.EDU
Reply-To: robinson@renoir.Berkeley.EDU (Michael Robinson)
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Organization: University of California, Berkeley
Lines: 23

In an article in a recent Amazing Computing (V.2 #7), Oran Sands III asserts
that the inferior quality of Amiga composite output (compared to other 
composite output) is due, in part, to a poorly chosen resistor in the 
composite conversion circuitry which does not conform to the Motorola 
specification for the MC1377P composite encoder chip.  He provides rather
extensive and impressive documentation of his claims, however, before I 
open up my Amiga and start flailing about with my soldering iron, I would
like to solicit comment from Commodore representatives, ex-Commodore 
personnel, or anyone else who knows an R-Y axis from a sync pulse.

Also, in the article he makes a distinction between two flavors of Amiga
1000, each of which requires a different fix.  However, he is unable to
describe which computers are which flavor beyond those which are
pre-June '86 and those which aren't.  As I bought my Amiga around June '86,
I was wondering if someone at Commodore could provide a more detailed
distinction between the two.


Thank you.

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Mike Robinson                                 USENET:  ucbvax!ernie!robinson
                                              ARPA: robinson@ernie.berkeley.edu