lippin@spam.berkeley.edu (The Apathist) (06/15/89)
I've just started using a Mac II with a 40MB Apple internal hard drive. Unfortunately, my old hard disk, an old and clunky 20MB LoDown external, can't be mounted together with the internal drive. I suspect the problem is that both are set to use SCSI ID 0. Neither drive has a convenient way to change the SCSI ID, so I'm looking for an inconvenient way. The LoDown has a controller board labeled OMTI 3100, which has a large number of jumpers, some of which might be used to change the ID. Does someone know how to do this? Alternatively, is there a practical way to change the ID of the Apple internal? Thanks, --Tom Lippincott lippin@math.berkeley.edu ..ucbvax!math!lippin "I just channel my rebellion into the mainstream." --Charlie Drakes in "Something Wild"
dwells@Apple.COM (Dave Wells) (06/15/89)
In article <25473@agate.BERKELEY.EDU> lippin@math.berkeley.edu writes: >I've just started using a Mac II with a 40MB Apple internal hard >drive. Unfortunately, my old hard disk, an old and clunky 20MB LoDown >external, can't be mounted together with the internal drive. I >suspect the problem is that both are set to use SCSI ID 0. Neither >drive has a convenient way to change the SCSI ID, so I'm looking for >an inconvenient way. > >The LoDown has a controller board labeled OMTI 3100, which has a large >number of jumpers, some of which might be used to change the ID. Does >someone know how to do this? The OMTI 3100 does have a set of jumpers dedicated to SCSI ID addressing. If I remember right, they should be located toward the center of the board, offset diagonally about an inch or so. If the drive is really set to ID 0 then there should be no jumpers on any of the pins in this set. It's a binary configuration, so the first set (on the SCSI cable end I think) would generate a 1 and the 3rd set would generate a 4. If you want 6, put jumpers on the 3rd and 2nd set. I've started from the wrong end before and not harmed anything, so this shouldn't be a problem. Just try again. (Standard disclaimers apply) You'll have to power off the drive each time you want to change these jumpers or the change won't take effect (besides the increased risk of ruining something.) -Dave -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Dave Wells, Apple Computer, Inc. MS: 37-O (408) 974-5515 Mail: dwells@apple.com or AppleLink d.wells or GEnie D.WELLS These opinions may be nothing more than the ramblings of a fatigued tinkerer -=-=-=-=-=-=-=-=-=-=-=-=- There's one big difference between genius and stupidity. Genius has limits. -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
straka@ihlpf.ATT.COM (Straka) (06/22/89)
For the record: SMS OMTI 310[035], 3110 controller SCSI address jumpering: W1-3 (right next to the 5080 that is nearest to the 50-pin SCSI connector W1=lsb W3=msb shorted=1, open=0 I THINK that W1 is nearest the SCSI connector. Caveat: I'm looking at the manual, not the board. -- Rich Straka att!ihlpf!straka MSDOS: All the wonderfully arcane syntax of UNIX(R), but without the power.