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From: HALLAM@vax1.physics.oxford.ac.uk
Newsgroups: comp.sys.transputer
Subject: Inmos links, the C004 and everything.
Message-ID: <8903081315.AA10484@uk.ac.ox.prg>
Date: 8 Mar 89 17:31:03 GMT
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X-Unparsable-Date: 8-MAR-1989 13:14:11 GMT +01:00

In respones to the recent letter from D.Bareham it is interseting to note
that he does not explain why the C004 slows down links.

The T.puter data sheet states that the T8 is capable of sending the acknowlege
about 5 bit periods after the start of receiving the message. This would
suggest that the C004 which introduces a 1.5 bit delay should not slow
the link. Unfortunately the link is not able to begin transmission of the
next byte until 5 bit cycles after receiving the acknowlege. 

Appologies to Dave Jefferson of CERN who worked out all this stuff for 
pre-empting but people seem to need to know !

Note to the guys at Inmos : Why didn't you tell us in the data sheet !
You could have figured that we would work it out sooner or later anyhow.

     P.Hallam-Baker, 

Oxford ZEUS collaboration.