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Path: utzoo!mnetor!seismo!rutgers!cbmvax!daveh
From: daveh@cbmvax.UUCP (Dave Haynie)
Newsgroups: comp.sys.amiga
Subject: Re: 80 track 5.25" drive help needed!
Message-ID: <2060@cbmvax.UUCP>
Date: Tue, 30-Jun-87 18:44:12 EDT
Article-I.D.: cbmvax.2060
Posted: Tue Jun 30 18:44:12 1987
Date-Received: Thu, 2-Jul-87 01:00:09 EDT
References: <383@esunix.UUCP>
Organization: Commodore Technology, West Chester, PA
Lines: 39

in article <383@esunix.UUCP>, blgardne@esunix.UUCP (Blaine Gardner) says:
> Keywords: df2: 80 track 5.25 SOS
> 
> I need help with getting a 5.25" drive to format to 80 tracks under
> AmigaDOS.

> 1) I cannot format to 80 tracks. Using the mountlist entry suppled on
>    the 1.2 workbench I have changed "df1:" to "df2:" and "unit 1" to
>    "unit 2". This allows the drive to work as a 440K AmigaDOS drive.
>    I expected that changing HighCyl from 39 to 79 would allow all 80 
>    tracks to be used, but FORMAT dies on track 41.

Hmmm.... Sounds like the right thing to do (I assume you're hooking the
drive in after df1:, adding a "mount df2:" to your startup-sequence).
Have you added any external, Amiga style logic to the drive, or is this a
straight direct-connect?  Amiga drives auto-identify themselves if the
proper circuitry is present, eliminating the need for a mountlist.  And in
fact I've never used one with a mountlist, but it sounds like you're
doing everything OK.  If you DO want it automatically recognized, the
3-1/2" circuit, not the 5-1/4" circuit, would be the proper one to add
(I'll post it if you're interested).  If for some reason the Amiga thinks
the drive is identifying itself as a 5-1/4" drive (really, this circuit says
"40 tracks", the actual drive diameter isn't important), the Amiga won't
pay attention to the mountlist.

> 2) The diskchange signal is not being read by the Amiga. I have CHNG*
>    wired from pin 2 of the 34 pin drive connector to pin 11 of the 
>    DB23. The Teac drive does generate a diskchange signal.

That's correct.  Are you actually seeing the change signal falling (on a
'scope or something).  This output must be open-collector, but I'd expect
most drives to present such an output directly; both of the Amiga
style drives do this properly.

> Blaine Gardner @ Evans & Sutherland
-- 
Dave Haynie     Commodore-Amiga    Usenet: {ihnp4|caip|rutgers}!cbmvax!daveh
"The A2000 Guy"                    BIX   : hazy
	"Catch a wave and you're sittin' on top of the world" -Beach Boys