[rescue] Mac IIfx compatible NuBus video card.
gsm at mendelson.com
gsm at mendelson.com
Sun Nov 8 11:22:35 CST 2009
On Sun, Nov 08, 2009 at 11:24:06AM -0500, Mark G. Thomas wrote:
>So, now I've got a working ethernet card, I'm trying to do something
>useful with the IIfx.
I found this nosing around the Apple web site:
http://support.apple.com/kb/TA42169
Why Is There A New Black Terminator For The Macintosh IIfx?
===========================================================
One of the features of the Macintosh IIfx is a new SCSI chip that
provides SCSI data transfer rates up to 3MB per second, faster than any
earlier Macintosh systems. To achieve these transfer rates, components
on the Macintosh IIfx logic board are smaller and faster, this makes
them more susceptible to signal reflections on the cable. The new
terminator adds the filter capacitors and changes the resistor values
for some of the signals to reduce the reflections.
This originally was from 1992, when 3MB per second was fast. I wonder if later
SCSI terminators designed for 5MB or faster SCSI would work?
There are also several warnings that you should only have 1 black terminator
on a chain, even with a IIfx.
Geoff.
--
Geoffrey S. Mendelson, Jerusalem, Israel gsm at mendelson.com N3OWJ/4X1GM
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