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From: Roger.Sheppard@bbs.actrix.gen.nz
Newsgroups: comp.sys.atari.st.tech,comp.periphs.scsi,comp.periphs
Subject: Re: WANTED: Hardware specs
Message-ID: <1990Nov21.134120.29084@actrix.co.nz>
Date: 21 Nov 90 13:41:20 GMT
References: <1990Oct29.120422.21737@newcastle.ac.uk>
Sender: Roger.Sheppard@actrix.co.nz (Roger Sheppard)
Organization: Actrix Networks
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<1990Oct29.234258.22858@math.lsa.umich.edu>
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Organization: Actrix Information Exchange, Wellington, New Zealand
Keywords: hardware, SCSI, ST, ATARI
Comment-To: hyc@math.lsa.umich.edu
 
Some notes on using O.E.M disk drives on Ataries
the Driving power of the YM-2149 that is used to 
drive the drive select and side select is only
one LS load, this meens that all O.E.M. drive
fall out side the specs, they use 1 K Pull up
resistors, you will find that on Atari Drives
that these are removed or replaced with 2.7 K
resistors, Note: this is only on the Side select
and Drive select lines..
There was some info on this in a Elector Mag. some time back
I still have the Mag: but not handy at the moment, but it
was on about putting a Buffer in those lines 7417 i think
I have never seen any othere mentions of this that the
YM-2149 OPs are only 1 LS load..