devices compatibility on Dilog SQ703A
shadoooo
I searched for a manual for this card without luck.
This card is a TMSCP to SCSI controller for tape units.
Analyzing the board components I understand that this is a HVD-SCSI
interface, so normal single-ended SCSI tape units won't work. I tried
to connect a seagate 1GB/2GB DAT/DDS unit through a HVD-SE adapter, I
can successfully read the SCSI indent of the device using a console
option to send manual SCSI commands, so I think that the data-
connection and terminations are ok. After that I tried to map the
device as a TK50, but unfortunately something doesn't work, on the OS
the device is reported as offline, and the DAT make blink the leds to
notify some wrong operation problem. I thought that the SCSI commands
protocol used bu the Dilog card would assure compatibility to all tape
devices, because defined by an ANSI standard, but it seems I was
wrong.
Anybody used this interface? What tape units should be supported?
Thanks for any help,I'm out of luck with this card...
Andrea
Johnny Billquist
I can think of one thing. When talking TMSCP, you are using a mapping to
SCSI. The question is which SCSI unit number you are mapped to. Might
not match the unit number set on the DAT. If so, the device you are
trying to talk with through TMSCP might very well be offline, since it
don't exist. :-)
By convention, SCSI tapes usually use unit number 5 or 6 (I think it
is). If you have a TMSCP-SCSI only, it might very well think that TMSCP
unit #0 will match to SCSI unit #0, and not #5.
By the way, are you really sure about the HVD? Since your cabling seems
to work, this is more of an academic question. But many connectors are
actually backwards compatible with SE SCSI.
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: b...@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
shadoooo
number to TK50 unit 0.
I'm not absolutely sure about an option for "byte swapping", but I
tried both enabled and disabled options.
If I try to access the TK50 when it is not mapped, I become a
different error, something like a OS trap,
while if I access the mapped one the unit is "only" offline, but
memory mapped register are working to give this info to the kernel.
About HVD, this is sure. If I connect the 50pin cable straight to the
tape device, nothing works, neither the manual SCSI command operation.
I bought an adapter, and in this way the device can be accessed. But
it seems that the Dilog is sending out some wrong or unexpected SCSI
command,
because when I execute an mt -rew command, for example, the leds on
the front begin to blink, but after that nothing.
Christian Corti
> About HVD, this is sure. If I connect the 50pin cable straight to the
> tape device, nothing works, neither the manual SCSI command operation.
If you did that, you probably have toasted at least some of the SCSI bus
drivers/receivers on your drive and/or your controller.
Christian
shadoooo
stuttgart.de> wrote:
I don't think so. As I said, now with the HVD adapter I can access the
DAT sending a standard INQUIRY command, and it answers as it should...
I read the inquiry answer string that I could also obtain on a linux
box.