??? SCSI Port for OmniBook 800CT with other SCSI devices ???
Vincent Phan
I have an H-P OmniBook 800CT: 166MMX with CD-ROM. This notebook have a
special SCSI connector which I used for my H-P CD-ROM. I tried to daisy
chain with few more SCSI devices like: SCSI Scanner, External SCSI
Drive, but there's no luck at all. If anyone out there has came across
this problem, please share your experience....
Thank you very much.
Vincent Phan
sailo...@my-dejanews.com
I have done it, but the SCSI on my OB 800CT has caused me lots of work, it
was not easy. There are a lot of things that all must be correct before
anything will work. You have probably done all of these, but the things that
come to mind are:
There are a bunch of software things that must be right, but if the HP CD-ROM
works by itself, then they are probably correct.
Always turn off the computer and each device before connecting (or removing)
the cables.
If you have Windows 95 or 98, with nothing connected, and the computer
running in Safe Mode, right click on My Computer, left click on Properties.
Select Hardware Profiles, highlight Dock 1, and left click on delete and
remove Dock 1. You cannot do this if the cable is connected. Close the
windows back to Desktop. Anytime you change what is in the SCSI chain,
remove Dock 1 in this manner.
Restart the computer, regular mode is OK.
When is is fully restarted, Shut down and attach all the cables
There are a bunch of different kinds of SCSI. I THINK all are backwards
compatible, but they may not be. Are all yours the same kind of SCSI? The OB
800 uses <SCSI-2 fast>. Make sure they can all talk the same language.
Have the correct connector or a VERY GOOD adapter at each cable connection.
Connect all the cables and devices in a daisy chain, but not a circle. For
example: Omnibook to scanner to external HDD to CD-Rom.
The last device, but ONLY the last device, must be terminated. This is so
the signals do reflect back down the cable. Many devices, but not all, have
a terminator built inside them. On the HP CD-ROM it is turned on/off by DIP
Switch 4. An <active> terminator is better than a <restive> terminator. If
the terminator is not built in, put a separate terminator (looks like a
connector with no cable) on the last unused connector port. Turn off all
other terminators.
Set a different SCSI ID number on each device. I think 0 (zero) is the
number used by the adapter card in the computer, so try to use numbers 2 thru
6. Each device must have a different number.
Turn on (and confirm that) each device is running BEFORE you start the OB
800. Otherwise when the computer wakes up and calls down the SCSI cable to
see who is out there, some may not answer. If they don't answer, then the
computer will not see them.
Start the OB 800 and you may have to wait a long time while it figures out
what is now on the SCSI chain. When it is running, double click on my
computer (or go to explorer) and see how many drives you have. If it is
working right, all the drives (and I suppose the scanner, but I don't know)
should show up.
I have only used drives on the SCSI. Windows 95 can Plug and Play many
things but many devices need special drivers or the like before they can work
with the computer. You may have to contact each device manufacturer. If you
change any part of the SCSI string, you should remove Dock 1 and let Windows
build a new data base.
Perhaps someone else can give better info. Search the web for SCSI, and
SCSI-2, and things like that or look at the web sites for your accessories
for more info.
I have more info about SCSI on my other OB 800's hard drive, but both of them
are sick right now and I can't get at it. I have two Omnibook 800s and have
had LOTS of troubles. :-(
Good luck
Dave Heath
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