Message-Id: <[EMAIL PROTECTED]> Date: Tue, 14 Dec 2004 18:55:43 -0500 From: Bill Taylor's <[EMAIL PROTECTED]> Subject: Connecting Apple/IBM SCSI drive 'DORS-32160'?
Hello All,
I've been given an older 2 gig hard drive that according to the label is an Apple/IBM model 'DORS-32160'.
I'm in something of a bind because although I've easily connected the power and data cables, I don't know where to connect the SCSI idea cable?
I'm using a generic SCSI external case, and although it can accommodate two drives [presumably used for a RAID] the wires that connect the SCSI switch to the drive have what looks like a 3 pin receptacle at the end.
On the underside of the drive, there are two rows of pins which so far, have one jumper on them in the eighth position from the right side. In other words, when viewed from upside down with data receptacle at the top, the jumper is on the fifth set of jumpers to the right of the outer edge of the drive.
There's something of an index, detailing what each set of the 21 pins are for. According to this index sticker, and going from left to right, position:
12 = LED out 11 = Disable Parity 10 = Delay Start 6/12 9 = Auto Start Delay 8 = Spare 7 = Disable Unit Attn 6 = SCSI Term On 5 = Disable Auto Spin 4 = ID Bit 0 3 = ID Bit 1 2 = ID Bit 2 1 = Spare [50 pin] ID bit 3 [For Wide]
The spacing on the two rows of 12 pins is such that I can't connect this 3 pin receptacle on the SCSI idea cable. Regardless, I can't determine which sets of pins this cable should be connected to anyway. When all is powered up, the machine wont mount the drive, and I'm prevented form formatting or initializing it with Drive Setup 2.0.7.
The good news is that this and some three other drive formatting and initialization programs do recognize the drive, but all fail to work with it.
I am assuming this is because I've not been able to properly set the SCSI ID.
Can anyone please tell on which set of pins this SCSI ID cable should be connected to?
I've tried doing a Google search on this, and have come up with little to no information detailing on which pins to attach this SCSI ID cable, that at the other end is connected to the SCSI ID switch on the outside of this case.
Thanks in advance for any and all help on this matter.
Cheers,
Bill
Hi Bill...
In the many iterations of SCSI drives, some have the socket for that ID cable built into the end, side or bottom of the plastic end molding. Others, take advantage of the SCSI addressing pins which are to be found on the PC board (the bottom) of the drive.
If you see such a set of pins, there will usually be a jumper which is removable, and bridges (connects) two pins. The SCSI addresses are usually printed on the PC board, adjacent to the pairs of pins.
In some instances, you can remove the jumper and push the end of the ID cable onto the set of pins. I have seen several drive cases which can adapt to this, and others which cannot.
If your drive cannot adapt to the cable of the case, just choose an address and set the drive with the jumper. Be sure that the address you choose, is not the same as/in conflict with any other SCSI device in use.
If you have it or can find it, the little utility/control panel 'SCSI Probe' is very useful when setting up or troubleshooting anything SCSI. It can mount or dismount devices, as well as signifying their addresses.
I have, just for the fun and challenge of it, connected the maximum number of SCSI devices to various vintage Macs. It is puzzling how a chain of devices which are well-tolerated by one old Mac, will not work with another. This has led to the concept of 'SCSI Voodoo'.
If your case has the option of 'active termination, try it with that turned on and off and see which way works best on your Mac. If not, be sure to apply a 'terminator' to the empty Centronics-50 connector on the case. In the instance of a chain of several SCSI devices, terminate the last device in the chain.
Be sure your external drive is up and running before booting your Mac. Beware of connecting or disconnecting SCSI cables while the Mac is up and running.
Good luck!
==Gene Poole==
Starmax 3000, and many other Macs, 512K to DP G4
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