hunt@boulder.Colorado.EDU (Lee Cameron Hunt) (07/21/90)
I'm trying to daisy-chain a Mac 140Mb SCSI drive on my Microbotics
HardFrame controller. I've never done SCSI daisy-chaining before, so
I'd like to know:
1) Is the daisy-chaining direct (ie: do you just plunk another
drive onto the same cable with the same pinouts?)?
2) The connector is different on the Jasmine (a 55-pin Centronix-like
connector) than my original drive (presumably 'cause it's a Mac
drive which I've heard is different). How do I make a cable
for the Jasmine (pinouts?)?
3) Has anybody ran into any weirdnesses with the Jasmine drive when
interfacing to a HardFrame? When I installed my first drive the
HardFrame polled my Miniscribe drive and I could use the defaults
(for # of heads, interleave, etc.). Is this a SCSI standard thing?
The reason I ask is that the Jasmine drive has a jumper to select
which SCSI device it is which I don't recall having to have to set
on my Miniscribe, but I could be wrong.
Thanks for any info.
--Lee
"Nothing is more disorginized than Calvinball!" -- Calvin & Hobbes
hunt@spot.colorado.edu ...!ncar!boulder!spot!hunt
rick@tmiuv0.uucp (07/23/90)
In article <23738@boulder.Colorado.EDU>, hunt@boulder.Colorado.EDU (Lee Cameron Hunt) writes: > I'm trying to daisy-chain a Mac 140Mb SCSI drive on my Microbotics > HardFrame controller. I've never done SCSI daisy-chaining before, so > I'd like to know: > > 1) Is the daisy-chaining direct (ie: do you just plunk another > drive onto the same cable with the same pinouts?)? Well, yes, it is pretty much the same. Remember that the LAST drive on the chain must have terminators in it and that each device must have a unique SCSI ID number (see question 3 below). > 2) The connector is different on the Jasmine (a 55-pin Centronix-like > connector) than my original drive (presumably 'cause it's a Mac > drive which I've heard is different). How do I make a cable > for the Jasmine (pinouts?)? Are you sure it's not a 50-pin Centronics? That's a standard SCSI II connector, and all you need to do is crimp on the connector -- providing you're using ribbon cable. Make sure that the colored stripe on the cable is lined up with pin 1 of the connector. > 3) Has anybody ran into any weirdnesses with the Jasmine drive when > interfacing to a HardFrame? When I installed my first drive the > HardFrame polled my Miniscribe drive and I could use the defaults > (for # of heads, interleave, etc.). Is this a SCSI standard thing? > The reason I ask is that the Jasmine drive has a jumper to select > which SCSI device it is which I don't recall having to have to set > on my Miniscribe, but I could be wrong. I've not heard of any weirdness, but it's possible. The Jasmine drive is probably a Miniscribe or Quantum in Jasmine's box. If you can open up the box and let me know what kind of drive it is, I'll tell you if there's any strangies with it (some drive manufacturers really don't do SCSI right, and we can have problems with them). Yes, you have to change SCSI ID numbers. SCSI supports eight devices on the bus. The HardFrame is defaulted to device 7, so you have devices 0 to 6 for your use. The odds are that the Miniscribe was set to device 0, so you'll need to set the Jasmine drive to a number from 1 to 6. If you're not sure what the Miniscribe is actually set to, run the RDPrep program. It'll tell you what drives are on your bus. > Thanks for any info. No problem. As Vic Wagner of Metadigm says: "That's what we're here for!" > --Lee > "Nothing is more disorginized than Calvinball!" -- Calvin & Hobbes > hunt@spot.colorado.edu ...!ncar!boulder!spot!hunt > ---------------------------------------------------------------------------- [- O] Rick Stevens (representing MicroBotics on Usenet and CIS) ? EMail: uunet!zardoz!tmiuv0!rick -or- uunet!zardoz!xyclone!sysop V CIS: 75006,1355 (75006.1355@compuserve.com from Internet) "I'm tellin' ya, Valiant! Da whole ting stinks like yesterday's diapers!" - Baby Herman in "Who Framed Roger Rabbit" ----------------------------------------------------------------------------