[2142] in linux-scsi channel archive
Re: Question about NCR based board.
daemon@ATHENA.MIT.EDU (Larry M. Augustin)
Fri Jul 11 13:02:05 1997
Date: Fri, 11 Jul 1997 09:35:59 -0700
From: "Larry M. Augustin" <lma@varesearch.com>
To: milliByte@DeathsDoor.com
CC: linux-scsi@vger.rutgers.edu
In-reply-to: <19970708151828.HF28718@infinity.milliByte.de>
The '825 can indeed be used for a board with only narrow connectors.
Symbios did have a reference board design like that. I think it was
the 8250S. (The 8251S being the board with narrow and wide adapters.)
The reasons for that design were economics. Connectors are expensive.
Using only narrow interfaces lowered the boards cost. By making only
one chip (the 825) instead of both the narrow chip (the 815) and the
wide chip, production costs on the chip go down.
Larry
>Posted-Date: Tue, 8 Jul 1997 16:58:23 +0200
>Received-Date: Tue, 8 Jul 1997 16:58:23 +0200
>Date: Tue, 8 Jul 1997 15:18:28 +0200
>From: milliByte@DeathsDoor.com (Dirk Foersterling)
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>Reply-To: milliByte@DeathsDoor.com (Dirk Foersterling)
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>Hi linux-scsi@,
>
>I use a NCR 53c825 based board. The driver I use is ncr53c8xx (V1.18d)
>and this driver confirms the SCSI chip being an NCR 53c825. (It is
>printed on the chip, too).
>
>Now that I took time to find out some more about SCSI, I have read
>several times that the 825 is a WIDE chip and that there exist boards
>lacking the narrow connector.
>
>I'm not 100% sure, but it seems that my board is vice-versa and does not
>have a WIDE connector. There's only one internal connector (narrow) and
>a high density 50 pin external connector. AFAIK wide-SCSI connectors are
>68 pin.
>
>The BIOS (SDMS 4.0, Flash-EPROM) counts from SCSI ID 0 up to 15 indicating
>a search for wide devices.
>
>Does anybody on the list know what's up with this board? Its design looks
>like a bad joke. Or did I get something wrong and it is possible to connect
>wide-SCSI devices to that board?
>
> -dirk
>
>--
> D i r k F "o r s t e r l i n g
>milliByte@DeathsDoor.com - http://www.informatik.uni-frankfurt.de/~dirk
> -------------
> 42 means: for tea, too.
