* Re: Diamond Fireport 40 (Sym875)
[not found] <Pine.LNX.4.03.9811252309520.23541-100000@mercator.cs.kuleuven.ac.be>
@ 1998-12-10 16:52 ` D. Lance Robinson
1998-12-16 9:13 ` Geert Uytterhoeven
1 sibling, 0 replies; 2+ messages in thread
From: D. Lance Robinson @ 1998-12-10 16:52 UTC (permalink / raw
To: linux-scsi; +Cc: linuxppc-dev
Geert Uytterhoeven wrote:
>...
> I borrowed a FirePort 40 from a friend for testing.
>
...
> The Viking was the last drive on the chain. I tried playing with the
> termination jumper (read: what I thought was the termination jumper, left my
> specs somewhere else :-(, but to no avail. I connected a borrowed CD-Writer
> (PLEXTOR CD-R PX-R412C Rev 1.04) with correct termination to the end of the
> chain to make sure it was no termination problem, but that didn't help.
>
> Then I removed the Viking from the chain, and everything worked fine. Could it
> be that the cable was too long to use FAST-20 transfers with the Viking? It was
> about 75 cm long.
>
Geert,
You still probably have a termination problem. You say that the CD-R
works fine. This is a narrow device and only terminates the narrow
signals. The best thing is to use a wide active terminator at the end of
the cable.
<>< Lance.
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* Re: Diamond Fireport 40 (Sym875)
[not found] <Pine.LNX.4.03.9811252309520.23541-100000@mercator.cs.kuleuven.ac.be>
1998-12-10 16:52 ` Diamond Fireport 40 (Sym875) D. Lance Robinson
@ 1998-12-16 9:13 ` Geert Uytterhoeven
1 sibling, 0 replies; 2+ messages in thread
From: Geert Uytterhoeven @ 1998-12-16 9:13 UTC (permalink / raw
To: linux-scsi; +Cc: linuxppc-dev
On Wed, 25 Nov 1998, Geert Uytterhoeven wrote:
> On Mon, 23 Nov 1998, I wrote:
> > I'm considering to buy a Diamond Fireport 40 (SYM53C875 based) UW-SCSI host
> > adapter for my CHRP box (Linux/PPC). Are there known problems with this board
> > on non-Intel architectures?
> >
> > Should I go for a SYM U2W-SCSI board instead? I have a Quantum Viking II U2W,
> > which is currently connected to the (slow) onboard MESH Fast SCSI.
>
> I borrowed a FirePort 40 from a friend for testing.
>
> I have the following SCSI devices:
>
> - QUANTUM VIKING II 4.5WLS Rev 3506 (U2W, with UW68-to-U50 convertor)
> - HP HP35480A Rev T503
> - QUANTUM FIREBALL_TM3200S Rev 300X (the one with tagged queueing bug ;-(
> - PLEXTOR CD-ROM PX-12TS Rev 1.02
>
> Originally these were all connected to the on-board MESH Fast-SCSI controller,
> using a narrow cable, termination on the CD-ROM.
>
> Since I had no wide cable for testing, I always used the Viking with the
> UW68-to-U50 convertor, even on the '875.
Just bought a Dawicontrol DC-2976UW (Sym875 based), and it works fine with the
ncr53c8xx driver under Linux/PPC. This time I connected the Viking II using a
wide cable. Now it flies at 17 MB/s. Connected to the MESH, it did 6 MB/s only.
The '875 also causes less interrupt stress: a simple read benchmark with hdparm
generates only 256 interrupts, compared to approx. 3500 with the MESH.
The only disadvantage is that I don't have an Open Firmware driver for the
'875, so I can't boot from the disk. I have to keep my Fireball on the MESH.
Well, I'll get a cheap second hand disk for booting, so I can move the Fireball
to the '875, too.
Greetings,
Geert
--
Geert Uytterhoeven Geert.Uytterhoeven@cs.kuleuven.ac.be
Wavelets, Linux/{m68k~Amiga,PPC~CHRP} http://www.cs.kuleuven.ac.be/~geert/
Department of Computer Science -- Katholieke Universiteit Leuven -- Belgium
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[not found] <Pine.LNX.4.03.9811252309520.23541-100000@mercator.cs.kuleuven.ac.be>
1998-12-10 16:52 ` Diamond Fireport 40 (Sym875) D. Lance Robinson
1998-12-16 9:13 ` Geert Uytterhoeven
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