Date: Thu, 2 Jan 1997 18:33:25 +0100 (MET) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-scsi@FreeBSD.org (FreeBSD SCSI list) Cc: Gilles.Bruno@ujf-grenoble.fr (Gilles BRUNO) Subject: Re: Q. Scsi pinout... Message-ID: <199701021733.SAA08015@uriah.heep.sax.de> In-Reply-To: <2.2.16.19970102152949.335f79f4@adm> from Gilles BRUNO at "Jan 2, 97 03:36:40 pm"
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As Gilles BRUNO wrote:
> Happy new year ! Excuse me if it's not the *real* good place
> to ask this question, but I'm looking for information on the
> scsi buses and pinout, so as to put a scsi hard disk on the
> external port of my aha1505 isa adapter (installing freebsd
> full source may be very disk-consuming...). Until now, I was
> unable to find 'good' online articles about them.
That's from chapter 4 of the SCSI-2 specs, for the 50-pin connector.
I don't think the mini-DB (``high density'' or ``SCSI-2'') connectors
differ in the principle pinout from the old Amphenol (``Centronics'')
parts.
What you're referring to as ``Apple'' is a cut-down pin assignment, so
it fits into a DB-25 connector. I don't assume you need this one.
Aside from Apple, i think it's mainly HP Scanners and SCSI Zip drives
that come with this (crippled) form.
Table 4-2: Single-Ended Contact Assignments - A Cable
==============================================================================
Connector Cable Connector
Signal Contact Number Conductor Contact Number Signal
Name Set 2 Set 1 Number Set 1 Set 2 Name
------------------------------------------------------------------------------
GROUND 1 1 1 | 2 2 26 -DB(0)
GROUND 2 3 3 | 4 4 27 -DB(1)
GROUND 3 5 5 | 6 6 28 -DB(2)
GROUND 4 7 7 | 8 8 29 -DB(3)
GROUND 5 9 9 | 10 10 30 -DB(4)
GROUND 6 11 11 | 12 12 31 -DB(5)
GROUND 7 13 13 | 14 14 32 -DB(6)
GROUND 8 15 15 | 16 16 33 -DB(7)
GROUND 9 17 17 | 18 18 34 -DB(P)
GROUND 10 19 19 | 20 20 35 GROUND
GROUND 11 21 21 | 22 22 36 GROUND
RESERVED 12 23 23 | 24 24 37 RESERVED
OPEN 13 25 25 | 26 26 38 TERMPWR
RESERVED 14 27 27 | 28 28 39 RESERVED
GROUND 15 29 29 | 30 30 40 GROUND
GROUND 16 31 31 | 32 32 41 -ATN
GROUND 17 33 33 | 34 34 42 GROUND
GROUND 18 35 35 | 36 36 43 -BSY
GROUND 19 37 37 | 38 38 44 -ACK
GROUND 20 39 39 | 40 40 45 -RST
GROUND 21 41 41 | 42 42 46 -MSG
GROUND 22 43 43 | 44 44 47 -SEL
GROUND 23 45 45 | 46 46 48 -C/D
GROUND 24 47 47 | 48 48 49 -REQ
GROUND 25 49 49 | 50 50 50 -I/O
==============================================================================
--
cheers, J"org
joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)
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