I recently bought a SCSI tower, SCSI-1 interface. It came with 1 CDROM and 1 HD. I had another CDROM and am trying to add it. HOWEVER, I just can't get it to work! They are on different SCSI IDs, I'm sure of it...but some of the other jumpers on the back I don't know about...here they are maybe somebody out their knows what they mean...


SONY CDROM
PARITY...currently checked on my setup
PREVENT/ALLOW...checked
TEST...not checked

COMPAQ CDROM
PARITY...checked
SECTOR SIZE...checked (dangling)
TERMINATOR...not checked
TERM POWER...checked

Also, on the Compaq cdrom the scsi ID options are 1,2, and 4 but on the SONY cdrom the options are 0,1, and 2....what's up with that? is there any reason why this is inconsistent?

THANKS! ~ PLEASE RESPOND VIA EMAIL...
mtinderholt@nre.com

It seems the (SNY)0,1,2 and the (CMPQ)1,2,4 threw me off because as soon as I put the SONY on #2 and the COMPAQ on #4 IT WORKED!!!

Super...now the question is how do I add more than 2 drives to my SCSI tower?! IF there are only 3 SCSI IDs, 1,2,and 4...I am brain storming here so lemme know if I am wrong in saying this...does the SCSI ID #1 act like a SCSI controller rather than a single disk? So SCSI ID #1 could actually hold, say 2 or 3 devices? and #2 and 3 can hold 2 or 3 devices as well? I read that a single SCSI controller could hold 12 devices...so dividing 12 by the 4 scsi ids i've seen (0,1,2,4) that would mean 3 devices on each id, no?

THANKS AHEAD OF TIME

I don't know if you have your answer yet but your SCSI-1 devices are managed by your controller card and it can only handle 7 devices at one time. Each different device can be on either the external connection or the internal connection but they all must have a unique ID number between 0 and 7. The controller usually has the ID of 4 or 7 so that is why you may only have 7 more unique IDs which correspond to 7 more unique devices. Usually you have to upgrade to SCSI 3 to handle 16 devices with one SCSI card or you can purchase another SCSI-1 card and install it within your system to give you an additional 7 more devices.

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I want tough but fair. Knock the living snot out of the guy. Then when the play is over offer him a hand to help him back up. On the next play, do the same thing to him again - Woody Hayes

SCSI ID #0,1,2 jumpers is referring to 2 to the power of 0(equals 1), 2 to the power of 1(equals 2) and the last one is 4. There are 3 jumpers for a total combination of 7 devices.
If you short the first and second jumpers marked 0 and 1(or 1 and 2 on another drive),
the ID of that drive is 1+2=3

Like omifox said, SCSI 1 controller cards normally
can handle 7 devices. 1 ID for itself, and 6 other devices.

What brand of controller card do you own, model number and
name?

__________________
Serious Soldier

Thanks Pronade. I know a lot about working with SCSI but never found out that information. Now I know a little bit more.

Appreciate that!

__________________
I want tough but fair. Knock the living snot out of the guy. Then when the play is over offer him a hand to help him back up. On the next play, do the same thing to him again - Woody Hayes

Here's a good site for learning even more about SCSI

http://www.scsita.org/aboutscsi/index01.html

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Serious Soldier