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Path: utzoo!watmath!watdcsu!herbie
From: herbie@watdcsu.UUCP (Herb Chong, Computing Services)
Newsgroups: net.arch
Subject: Re: 360 versus 370, MVCL, ICM, etc.
Message-ID: <552@watdcsu.UUCP>
Date: Thu, 25-Oct-84 13:03:51 EDT
Article-I.D.: watdcsu.552
Posted: Thu Oct 25 13:03:51 1984
Date-Received: Fri, 26-Oct-84 03:09:20 EDT
References: <ima.426> <1433@bmcg.UUCP> <1313@ritcv.UUCP> <197@rlgvax.UUCP>, <1744@sun.uucp>
Organization: U of Waterloo, Ontario
Lines: 18

The newest S/370 machines still have the same slowness of execution
with the "interruptible" instructions MVCL and CLCL.  This varies
from model to model, but not much has changed.  Incidentally, the 370/XA
architecture is changed in the way addressing is handled (31 bits), but
runs slower in S/370 emulation mode than 370/XA mode because the S/370
instructions are interpreted differently (I think it's using a different
set of microcode).  The 370/XA Principles of Operation would be the ultimate
reference for these things.  Of course, even in the slow S/370 mode, the top
of the line models are still faster than any of the older S/370 machines.

Herb...

I'm user-friendly -- I don't byte, I nybble....

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