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Path: utzoo!watmath!clyde!burl!ulysses!ucbvax!dillon
From: dillon@ucbvax.ARPA (Matt Dillon)
Newsgroups: net.micro.cbm
Subject: Re: An open letter to Bryce
Message-ID: <6234@ucbvax.ARPA>
Date: Sun, 14-Apr-85 18:48:58 EST
Article-I.D.: ucbvax.6234
Posted: Sun Apr 14 18:48:58 1985
Date-Received: Mon, 15-Apr-85 05:24:38 EST
References: <664@burl.UUCP>
Reply-To: dillon@ucbvax.UUCP (Matt Dillon)
Distribution: net
Organization: University of California at Berkeley
Lines: 26
Summary: 

In article <664@burl.UUCP> egb@burl.UUCP (egb) writes:
>Subject: An Open Letter to Bryce
>
>An Open Letter to Bryce Nesbitt ('of 1541 'FLASH'')
>
>Thanks, Bryce for sharing with us the 'Magic Incantation' that
>prevents destructive head-banging when loading certain
>copy-protected commercial software.
>Results? Superb!!!
>I still see the red light flash when the read errors are
>encountered, but the banging no longer occurs.  My grateful
>thanks!
>
>Why does a 'J' placed at that particular spot in the drive's
>memory have such a beneficial effect?

  The way the 'Magic Incantation' works is by modifying a flag in the drive
that tells the 1541's "Brain" that it has already banged the head. The normal
value for the location is (5). Up that to 128 and the head will 'shake'
but never bump. 133 and most of the 'shake' goes away. 156 and you are home
free. PLEASE NOTE; all this does is prevent the banging. The bad sectors
(3 in the case of Fleet System II) are still there and read as such.

 For those that missed the incantation here it is again;

 OPEN1,8,15:PRINT#1,"M-W"CHR$(106)CHR$(0)CHR$(1)CHR$(156):CLOSE1