Path: utzoo!utgpu!water!watmath!clyde!rutgers!sri-spam!ames!pasteur!cory.Berkeley.EDU!johnhlee
From: johnhlee@cory.Berkeley.EDU (John Lee)
Newsgroups: comp.sys.amiga
Subject: Help!! Adding an A2000 internal 5 1/4" drive
Summary: Are Amiga drives queried as specified in the Hardware Ref. Man?
Keywords: drives, hardware, interfacing
Message-ID: <662@pasteur.Berkeley.Edu>
Date: 10 Feb 88 18:46:13 GMT
Sender: news@pasteur.Berkeley.Edu
Reply-To: johnhlee@cory.Berkeley.EDU.UUCP (John Lee)
Distribution: na
Organization: University of California, Berkeley
Lines: 35

(Sorry if you've seen this already, but my previous posting didn't seem
 to go outside Berkeley.)

Help!  I'm attempting to interface an IBM compatible 5 1/4" drive (Qume)
to my B2000 and mount it internally (where a hard drive will eventually go).
I have the Amazing Computing article (vol. #1, issue #4, I think) and after
staring at it, it seems easy--too easy!  After perusing the Hardware 
Reference manual, it states (in the appendix, disk connector interface) that
Amiga drives has an identification mode that basically goes:

	1.  Controller asserts SELxB\
	2.  Controller asserts MTRxB\
	3.  Controller de-asserts MTRxB\
	4.  Controller deaserts SELxB\
	5.  Begin ID loop.  Controller asserts SELxB\ and the drive will
	    respond with the next bit of its ID on RDY\.
	6.  Controller deasserts SELxB\.  Repeat 5-6 until all 32 bits of
	    the drive's ID has been sent, MSB first.  3-1/2" drives are
	    assigned an ID of 0xffffffff and 5-1/4" drives have an ID of
	    0x55555555.

(Signal names may be off, I don't have the manual with me at the minutes, but
 they can't be confused.  the '\' means the signal is active low.)

Now the Amazing Computing article's interface doesn't address this ID
mode at all, and the vanilla 5-1/4" drives don't have an ID mode.  So
my question is:  Is the ID mode used at all, and can I get away without
it?  Since the Hardware Reference manual (Addison-Wesley) was made for
the A1000 and a very early version at that, perhaps the ID function was
ignored under later versions of AmigaDOS.  Thanks in advance!

					John Lee

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