SCSI burner problem

[Bleeding Edge]

You can also try updating the 2940 Bios. If it's the original Bios and you've had the card awhile, the card may have the version that does not auto-terminate correctly. www.adaptec.com/support/overview/aha2940.html#BIOS (http://www.adaptec.com/support/overview/aha2940.html#BIOS) Get the newest drivers from the top of this page too.

Go over the SCSI chain. www.adaptec.com/support/configuration/connect.html (http://www.adaptec.com/support/configuration/connect.html) Verify what BBA mentions.

Also, if your using a non-Adaptec external pin adapter (if your using one at all,) better to get the one from adaptec.

It's probably a termination issue. Could be that Bios -the external drive is terminated, the internal device is terminated and the card is terminating itself!


Edit-

Internal devices, if not self-terminating, are terminated with jumpers on the device. Only the last device of each chain is terminated.

[This message has been edited by Bleeding Edge (edited 06-03-99).]

[LJE2]

Ultra Wide SCSI 68 pin, is 16 bit, Ultra or Fast SCSI (50 pin, 25 pin external connectors) are 8 bit SCSI, if the cable you are using connects to the Adaptec card (using a HD68 connector) and adapts at the CDR to 50 pin or 25 and does not terninate the other 8 bits correctly you will have problems, as Bleeding Edge stated you must get an Adaptec adapter that terminates the other 8 bits correctly and then get the apporpriate cable. By just plugging in the cable and this causing problems leads me to believe this is a termination problem of the other 8 bits when converting from 16 bits to 8 bits.

[Harry]

Thanks for all the help!! I think LJE2 has isolated my problem with the extra 8 bit termination issue.

[Harry]

Do you have any ideas about this?
-I ordered a SCSI CD-Burner - external to plug into my 2940UW Adaptecboard (68-pin plug)
-I have 2 internal SCSI devices already there (IBM OEM hard drive andpd/cd drive)
-the minute I plug in the cable (not even the burner) it disables ID#0 (the hard drive) - freezes the system
-if I plug it in and boot the machine, the hard drive does not showup on the SCSI config utility (and it does not boot, of course), however,it will notice the CD burner type, model, etc. at the correct ID #6.
So far:
-I've checked all the IDs and none are duplicates
-I've disabled and re-enabled parity
-I've terminated the external drive using dip switches
-not sure how to terminate the hard drive or the pd/cd player internally(Adaptec says disable last internal one)
-I've tested the burner in another SCSI board (Umax scanner board)and it works but it states the transfer rate is too slow and an unbufferingmessage occurs.
It bugs me because it should work fine with the AHA-2940UW. Help!

[BBA]

I have a SYMBIOS UW SCSI controller, and I use SCAM for many different drives, never set any SCSI ID's with it. Some older controllers I work with do not support SCAM, so I have to set id's on those. So, what about removing jumpers and allowing SCAM to configure the drives?

Are you plugging it into the internal connector or external connector? Sometimes using the external will change the way the internal works.

BBA