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From: P7MAI017%FRCIRP81.BITNET@cunyvm.cuny.edu
Newsgroups: comp.sys.amiga
Subject: (none)
Message-ID: <11008@baldrick.udel.EDU>
Date: 13 Feb 90 14:53:29 GMT
Sender: mmdf@udel.EDU
Lines: 26

In reply to Jose L. Gomez-Rubio and Daniel Richardson, I believe
that it's possible to convert an external drive into an AMIGA 2000 why
I exchange my external drive to my internal drive on my AMIGA 500 !
I'm working also on a board which allow his user to connect any
standard drive (3"1/2,5"1/4 360 and 720 Ko) to his AMIGA via
the DB 23 connectors (for external drive) or via the SHUGART 34 pins
connector (for AMIGA 2000 internal drive).
I'm happy of my 5"1/4 360 Ko connected in this way to my AMIGA 500 because
documentation about that connection isn't very spreaded (that is to say
it is unexistant).
To connect 5"1/4 80 Tracks and 3"1/2 standard drive it's easier.
Briefly, you need to maintain MTR signal active via a flip-flop and
to activate RDY signal while disk is selected and motor don't run.
That later thing is just need in boot to allow AMIGA to recognize your
drive.
It's also the reason why it isn't sufficient to connect DB23 8 pin to
SHUGART 4 (or 16) pin like done by I don't remeber who, to connect
AT drive on AMIGA.
Notes: When I said below 5"1/4 360 Ko that means of course 5"1/4 drive
with 40 Tracks * 2 Sides. So when this drive is properly connected to
AMIGA you can format AmigaDOS disk which contains 440 Ko !

A plus,
Arnauld.

P7MAI017@FRCIRP81.BITNET