Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!bionet!ames!dftsrv!jagmac2.gsfc.nasa.gov!jim From: jim@jagmac2.gsfc.nasa.gov (Jim Jagielski) Newsgroups: comp.sys.mac.hardware Subject: IIfx upgrade and SCSI termination for int. hard disks Message-ID: <3086@dftsrv.gsfc.nasa.gov> Date: 10 Aug 90 12:00:48 GMT Sender: news@dftsrv.gsfc.nasa.gov Reply-To: jim@jagmac2.gsfc.nasa.gov (Jim Jagielski) Distribution: na Organization: NASA Goddard Space Flight Center Lines: 27 I'm interested in upgrading my Daystar 50 MacII to the IIfx, but the only real thing (besides bucks :) holding me back is this question of SCSI termination. I know that the IIfx upgrade "makes" you remove the termination from your internal disk and replace it with the IIfx terminator/filter. But my hard disk (CMS -170, Imprimis) does NOT like having it's internal terminators taken out. In fact, when I 1st got it, I tried it and the thing wouldn't boot. I had to rearrange my disks and tape drives to put that 1st. Of course, CMS says that "it should work without the internal terminatators although WE DON'T RECOMMEND IT." Translation: if it don't work without 'em, we don't know why, SO DON'T DO IT. How do I find out if this drive will work if I upgrade to the IIfx? I can't move it to some other point in the chain because one of my tape drives doesn't allow daisy-chaining, so that has to go last. There is some electrical difference between internal and external terminators, so I guess the question is whether the IIfx terminator is a TRUE internal terminator or if it's just a "modified" external one... if a drive needs an internal T, using an external T won't cut it... -- ======================================================================= #include =:^) Jim Jagielski NASA/GSFC, Code 711.1 jim@jagmac2.gsfc.nasa.gov Greenbelt, MD 20771 "Kilimanjaro is a pretty tricky climb. Most of it's up, until you reach the very, very top, and then it tends to slope away rather sharply."