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From: blgardne@esunix.UUCP (Blaine Gardner)
Newsgroups: comp.sys.amiga
Subject: 5.25" Homebrew & CHNG*
Message-ID: <453@esunix.UUCP>
Date: Mon, 17-Aug-87 01:08:47 EDT
Article-I.D.: esunix.453
Posted: Mon Aug 17 01:08:47 1987
Date-Received: Wed, 19-Aug-87 01:32:16 EDT
Distribution: na
Organization: Evans & Sutherland Computer Corporation
Lines: 33
Keywords: 5.25" Homebrew drive diskchange signal generation.

Regarding my postings of a month ago on homebrewing a 5.25" 80 track
(880K) disk drive:

As pointed out by George Robbins the `5.25"' and `3.5"' Amiga adapter
circuits in the A1000 expansion specs are really `40 track' and `80
track' circuits. Once I switched to the 3.5" circuit the 5.25" drive
formatted one of my old Apple II floppies to 880K. The thing works like a
champ now.

But the drive doesn't generate the diskchange signal that the Amiga
wants to see (you were right George, it was the drive's fault). Can
someone give me some help with generating this signal? I imagine it
could be generated from the write-protect sensor, but what kind of
signal does the Amiga expect to see? Can anyone give me some specifics?

The other question I've got is how will this 80 track drive work with
the Amiga or Dos-2-Dos MS-DOS utilities that are assuming a 40 track IBM
style disk format? Can either of them be convinced to make the 80 track
drive read & write like a 40 track drive?

Thanks in advance for any help.


P.S. There appears to be no truth to the rumor that 007 H.Q. is using an
     Amiga in "The Living Daylights". I saw it again last night, and no
     matter how hard I looked, I couldn't make any of their hardware
     look like an Amiga. (Now if the Amiga could just get the kind of 
     advertizing that Phillips had in the movie!)
-- 
Blaine Gardner @ Evans & Sutherland    540 Arapeen Drive, SLC, Utah 84108
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