🚀 go-pugleaf

harry.samuel@NOSPAM.com (Harry Samuel) wrote:

>My 50 pin terminator works fine with the 68 pin 2940UW external connector, my 
>50 pin scanner works also.
>
>-----------------------------Reply Separator---------------------------------
>
>> I could be wrong here, but I think the problem lies in trying to use a
>> narrow device to terminate a wide chain, even though you're using a 68->50
>> pin adaptor. 
>> 
>> From what I've read on the newsgroup, you can put fifty-pin devices on the
>> 68-pin part of the chain, but you can't terminate the 68-pin chain with a
>> narrow (50-pin) device. They just don't seem to work. (the extra bits fall
>> out or something 8-))   )    You need a wide device to terminate. This
>> really stinks for all of us who own 2940UW's, and would like to attach
>> external narrow devices.  I too was looking to add a scanner, but I
>> realized that I'm going to need another SCSI card to do it because the
>> external connector is wide. Hope this helps.
>> 
>> Regards,
>> 
>> Kurt
>> 
>> -- 
>> remove the * from e-mail address to reply
>> 
>> alister@aosrsrch.demon.co.uk wrote in article
>> <33f603cb.9356831@news.demon.co.uk>...
>> > I just installed the Adaptec 2940 Ultra Wide card and connected a
>> > Yamaha CDR400C to the internal 50-pin connector on the card and the
>> > HP5P Scanner to the "wide" external connector via a 68-pin to 50-pin
>> > SCSI cable. The internal 68-pin connector has nothing on it.
>> > 
>> > Well - the CD writer works like a dream but the scanner won't work at
>> > all. The manual says the scanner is SCAM compliant and terminates
>> > automatically. All the SCSI ID numbers are OK = scanner on 02, CDR on
>> > 03 and the 2940 on 07 - but only the CDR and 2940 appear in
>> > SCSI-SELECT utilities program. 2940 BIOS enabled - but apparently "not
>> > loaded". WIN95 won't pick up the scanner via PnP either. There does
>> > not appear to be any communication between the scanner and the 2940.
>> > Cable seems fine and well connected too.....?????
>> > 
>> > When the scanner is connected to external connector on the card not
>> > even the little green LED on the front comes on. I have tried
>> > "un-terminating" the Yamaha CDR by removing the jumper. Now nothing
>> > works - not even the scanner.
>> > 
>> > I was thinking about re-installing the small wedge-shaped scsi board
>> > that came with the HP5P - but I only have one "programmable IRQ" left
>> > and I am worried about possibly spoiling what is otherwise a
>> > successful implementation of CD-R using EZCD PRO and DIRECT CD.
>> > 
>> > Anyone got any ideas. I am very new to all this SCSI stuff.
>> > 
>> > Thaanx in advance. Any help, especially by email, will be much
>> > appreciated this end.
>> > 
>> > Alister
>> > 
>> > 
>> > If you are interested in UK motoring matters, why not visit our homepage
>> at the following URL: http://www.aosrsrch.demon.co.uk
>> > 
>
=======================================================
It's a mistake to use WIDE SCSI adapters unless you need WIDE SCSI.  If you
use an adapter from WIDE to NARROW, it should precede any narrow devices on
the chain, i.e. the WIDE devices should be between the controller and the
adapter to NARROW, so the WIDE bus can be properly terminated before going to
the NARROW cable.  

It's possible, in this case, that not all your devices receive TERMPWR, which
can be enabled with a jumper on the controller.  TERMPWR MUST be provided by
at least one, but may be provided by any or all devices on the chain.  It is
sourced via a diode, so not more than one device is likely to be sourcing
current at any one time.  AT LEAST ONE DEVICE MUST PROVIDE TERMPWR!  In order
to ensure this, I'd recommend enabling it on at least one device on the
outboard (50-pin) side of your 68 <=> 50 pin adapter.







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