feinberg@autarch.acsu.buffalo.edu (john a feinberg) (07/11/90)
Well two people were kind enough to answer my previous post which asked if I needed to have terminators at both ends of a 2-device SCSI bus, even though it already worked with one. Unfortunately, my account ate the messages so I can't reply to the senders directly. Now I have one more question: is there a way I can build my own terminator? Or just maybe stick resistors on the pins of my hard drive, or something like that? I don't want to pay $25 for a plug with some 50 cent resistors attached to it. I'd rather just pay for the 50 cent resistors. John Feinberg SUNY Buffalo
consp22@bingsuns.cc.binghamton.edu (Darren Handler) (07/13/90)
You can do it yourself. I have done it many times at my computer store,
however, I have forgotten the value of the resistors. But I will tell
you everything else.
On the controller board of the hard drive unit itself, torward the back
(where the cables connect) there will be 3 resistor banks, usually
yellow and I believe, 8 pins. If you see these, then the terminators are
installed. If they aren't installed, then all you will see are the flat
connectors where they plug into. You can look (if possible) at the
internal drive you have in you machine. If it is an SE, then the drive
is most likely installed in the machine controller side up. I think the
values of the resistors are 10K or 100K. I also don't remember if the
resistors are the straight through or parallel network type resistor. Sorry.
SCSI connector
\/
---|||||||||||||||||||||||-----------
| |
| |
| ------- -------- -------- |
| | -------------------
| | | |
| Approx location | |-----------------|
| of terminators | | | | | | | | |
| |
| | The resistors look like this
| | are usually lay on their side
| | so you don't see the pins if
| | they are installed into the
| | sockets.
-------------------------------------------------------------------------------
| Consp22@Bingsuns.pod.binghamton.edu | SUNY-B Computer Consultants - |
| Consp22@Bingvaxu.cc.binghamton.edu | Trying to keep the world safe from |
|---------------------------------------| the SUNY-B Computer users. |
| Consultant/Techie - World Computers |-------------------------------------|
| Computer Cons. - SUNY Binghamton | Darren `Mac Hack' Handler |
|-----------------------------------------------------------------------------|
I don't know if I am going to heaven or hell, I just hope God grades on a curvesjhg9320@uxa.cso.uiuc.edu (Maximum Slackness ) (05/18/91)
I have a Mac IIci with an External 80 Meg SCSI drive from LaCie and would
like to add an Internal 105 Meg Drive. I remember hearing something long
ago and far away about the IIci having some wierd termination scheme-
What is it that I have to do to properly terminate the SCSI chain?
--
No matter what you do, somebody always knew that you would...ckoch@soul.UUCP (Chriss Koch) (05/25/91)
> I have a Mac IIci with an External 80 Meg SCSI drive from LaCie > and would like to add an Internal 105 Meg Drive. I remember > hearing something long ago and far away about the IIci having > some wierd termination scheme- > What is it that I have to do to properly terminate the SCSI > chain? Your internal hard disk should be equipped with built-in terminating resistors. Leave them in. Next determine whether your external hard disk is equipped with built-in terminating resistors. If it is, then you need no other termination. However if the external hard disk does not have built-in terminating resistors, use one Cable Terminator, between the cable and the hard drive. -- ------------------------------------------------------------------------------- Chriss Koch Ampex Video Systems Corp., 600 Wooten Rd., Colo Spgs, CO 80915 UUCP: uunet!ampex!soul!ckoch SCORPION BBS 719.637.1458 (sysop) -------------------------------------------------------------------------------