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Path: utzoo!linus!philabs!seismo!rlgvax!cvl!umcp-cs!zben
From: zben@umcp-cs.UUCP
Newsgroups: net.micro,net.micro.apple
Subject: Re: Apple disk drive question
Message-ID: <3513@umcp-cs.UUCP>
Date: Tue, 1-Nov-83 16:16:24 EST
Article-I.D.: umcp-cs.3513
Posted: Tue Nov  1 16:16:24 1983
Date-Received: Fri, 4-Nov-83 02:25:52 EST
Organization: Univ. of Maryland, Computer Science Dept.
Lines: 7

[..]
Why does write protect switch connect to motor phase 1?  So the DOS can
test for write enable?  How else would it know not to try to write?
I recommend a close comparison of the controller and disk schematics from
the DOS manual with a copy of "Beneath Apple Dos", with particular
attention to the coding sequence given for "testing write protect"...
Ben Cranston       ...seismo!umcp-cs!zben       zben@umd2.ARPA