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From: ddd@THUMPER.BELLCORE.COM (Dorothy DeLuca)
Newsgroups: comp.sys.transputer
Subject: Re:  Any info on T425 - T414 compatibility ?
Message-ID: <9011291437.AA18121@raven.bellcore.com>
Date: 29 Nov 90 14:37:20 GMT
Sender: usenet@ucbvax.BERKELEY.EDU
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I know that on our boards when we raplaced T414's with T425's and tried
to run our code on them we ran into the following problem.  A program
compiled for a T414 could not run on a T425.  We needed to compile the
program for a T800.  In fact the T425 is just a T800 without the
Floating Point.  The problem then was that when we tried to load the
program the loader would try to initialize the T425 as though it were a
T800, ie. initialize some FP registers.  After about 1 to 2 minutes it
would give up trying to initialize these registers and then proceed
with the download and everything would run fine.  Initially we expected
the program to download rather quickly and since it didn't we assumed
that it was hung on the links.  Perhaps in your case you could wait a
little longer maybe the Worm program is just taking a long time in the
init process.  What we finally did was edit the source for the loader
by putting No-Op's in place of the floating point init commands.
Everything worked great after that.


Dorothy DeLuca
Bellcore