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From: "Robert I. Eachus" <eachus@mitre.org>
Subject: Re: Compiler for Z80/6510
Date: 1999/12/21
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Robert Dewar wrote:
 
> I have the Pops for the 3033, and I still do not know what
> you are talking about, please refer to the exact instructions
> you are referring to, thanks!

    I am not referring to any instructions because they were
undocumented!  You should see in the 3033 documentation that there were
several microcode extensions included in the base price, including the
one for APL support.  It was an optional add-on for many of the 370
series machines, including I think the 3031 and 3032, but was standard
on the 3033.

    With the extensions, benchmarking APL vs. Fortran or PL/I usually
resulted in a significant win for using APL.  In fact, many significant
systems used by the airline industry were written in APL by I. P. Sharp
because it was significantly faster than any other language on high-end
IBM mainframes.
 
    I did a lot of number-crunching on the 3033, and most matrix
operations were much faster in APL than using specialized statistics
packages from Fortran.  (Note:  I didn't care as much about speed as
about accuracy.  The APL domino operator was better for matrix
inversion--and linear equation solving--than several of the statistics
packages, and most especially on stiff or ill-formed matrices.)

-- 

                                        Robert I. Eachus

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