Re: fx termination

2001-07-25 Thread Gregg Eshelman

Sounds like an active terminator, which should
work better than the Special Black IIfx one.
Termination power must be provided to the bus,
either by the host adaptor (Mac) or one of the
drives to use an active terminator. Its generally
not a good idea to have more than two devices
providing termination power to the bus. Set one
device to provide power to the bus and the rest to
provide termination power only to themselves or
disable it on them.

--- Desert Fox [EMAIL PROTECTED] wrote:
 My Mac IIfx terminator is black with no green light.
 
 -- 
 Paul/.
 95 black 3000GT VR-4
 98 VFR800F, TBR aluminum hi exit
 formerly reasonable and prudent
  
 on 7/25/01 10:15, Scott Barber at
 [EMAIL PROTECTED] scribbled:
 
  I tried to post this question the other day, but
 it hasn't appeared on the
  last two digests, here it is again:
  
  Does the black terminator used for external SCSI
 devices with the MacIIfx
  have a green led?
  I'm being given one, and want to use the correct
 terminator...



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Re: fx termination

2001-07-25 Thread gamba

Scott Barber wrote:
Does the black terminator used for external SCSI devices with the MacIIfx
have a green led?
I'm being given one, and want to use the correct terminator...

IMHO the special fx terminator isn't needed for short distances.
SCSI is specified to work over a long distance that most of us never
encounter. Longer distances require more ideal termination (i.e. impedance
matching).
My fx has always worked fine with standard external SCSI termination at
lengths up to 4 feet, and I bet it would go up to at least 10 feet with no
problem.

Gamba
http://www.accesscom.com/~gamba




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Re: fx termination

2001-07-25 Thread Gregg Eshelman


--- [EMAIL PROTECTED] wrote:
 Scott Barber wrote:
 Does the black terminator used for external SCSI
 devices with the MacIIfx
 have a green led?
 I'm being given one, and want to use the correct
 terminator...
 
 IMHO the special fx terminator isn't needed for
 short distances.
 SCSI is specified to work over a long distance that
 most of us never
 encounter. Longer distances require more ideal
 termination (i.e. impedance
 matching).
 My fx has always worked fine with standard external
 SCSI termination at
 lengths up to 4 feet, and I bet it would go up to at
 least 10 feet with no
 problem.
 
 Gamba
 http://www.accesscom.com/~gamba

There is an article somewhere at apple.com which
tells which IIfx models need the special terminators.
IIfx shipped prior to (some date) need the special
external terminator and an internal SCSI filter
or internal special terminator if not using an
internal drive. (Who would ever have ordered, let
alone used, a IIfx without an internal HD?) IIfx
shipped after that date do not require any of the
special terminators or filters. Apparently at some
point Apple fixed the problem. Unfortunately they
didn't put any easily identifiable marking on the
logic boards or anywhere else to tell which are
the revised ones. :P Someone had a website with
a Mac serial number decoder so you could tell when
your Mac was built, but Apple threw a fit and
threatened to engage in lawyer tossing over it.
The first power up date in PRAM is not a sure fire
indicator of how old the Mac is. If you leave the
PRAM battery out or dead long enough the PRAM
will totally erase and lose that setting.

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manufacture date Re: fx termination

2001-07-25 Thread Gregg Eshelman


--- Kyle Hansen [EMAIL PROTECTED] wrote:
 
 
 Gregg Eshelman wrote:
 
  Unfortunately they
  didn't put any easily identifiable marking on the
  logic boards or anywhere else to tell which are
  the revised ones. :P Someone had a website with
  a Mac serial number decoder so you could tell when
  your Mac was built,
 
 I can tell you how to decode it on an old model. 
 The first character or 2
 are letters.  It/they denote the plant that the Mac
 was made in.  The next
 digit is the last # of the year, and the following 2
 digits are the week it
 was made.  So if you have a serial # that says: 
 F4420351PT it was
 manufactured in the 42nd week of 1994 at the Fremont
 California plant.

That could also be 1994. :)

=
The earth swarms with inhabitants. Why then should nature,
which is fruitful to an excess here, be so very barren in
the rest of the planets? Bernard de Fontenelle, 1686
[EMAIL PROTECTED]
My ICQ# 16024947

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Re: manufacture date Re: fx termination

2001-07-25 Thread Gregg Eshelman


--- Gregg Eshelman [EMAIL PROTECTED] wrote:
 
 --- Kyle Hansen [EMAIL PROTECTED] wrote:
  
  
  Gregg Eshelman wrote:
  
   Unfortunately they
   didn't put any easily identifiable marking on
 the
   logic boards or anywhere else to tell which are
   the revised ones. :P Someone had a website with
   a Mac serial number decoder so you could tell
 when
   your Mac was built,
  
  I can tell you how to decode it on an old model. 
  The first character or 2
  are letters.  It/they denote the plant that the
 Mac
  was made in.  The next
  digit is the last # of the year, and the following
 2
  digits are the week it
  was made.  So if you have a serial # that says: 
  F4420351PT it was
  manufactured in the 42nd week of 1994 at the
 Fremont
  California plant.
 
 That could also be 1994. :)

DOH! 1984... Nine-Teen Eighty-Four.

=
The earth swarms with inhabitants. Why then should nature,
which is fruitful to an excess here, be so very barren in
the rest of the planets? Bernard de Fontenelle, 1686
[EMAIL PROTECTED]
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Re: manufacture date Re: fx termination

2001-07-25 Thread Kyle Hansen



Gregg Eshelman wrote:

  That could also be 1994. :)

 DOH! 1984... Nine-Teen Eighty-Four.

I was wondering what you were talking about.  Yes.  It could also be 1984,
but it wasn't a Plus so you have to use a process of elimination to figure it
out.  I *know* your smart enough to know what year a mac came out Gregg.

-- Kyle H. Hansen

Rarely is the question asked: Is our children learning?  --George W. Bush


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Re: manufacture date Re: fx termination

2001-07-25 Thread Kyle Hansen



the pickle wrote:

 Considering that the IIfx was made from 1990-1992 or thereabouts, finding a
 serial number starting with 4 is probably pretty unlikely, but then I would
 guess Kyle was just giving an example :)

Bingo!  We have a winner.  That serial was just an example taken from a
Performa 475 that I was using as a foot-stool/Ram checker.

-- Kyle H. Hansen

Rarely is the question asked: Is our children learning?  --George W. Bush


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