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From: josh@polaris.UUCP (Josh Knight)
Newsgroups: net.micro,net.arch
Subject: Re: 386 Family Products (really IBM compatibility)
Message-ID: <313@polaris.UUCP>
Date: Wed, 27-Nov-85 00:21:16 EST
Article-I.D.: polaris.313
Posted: Wed Nov 27 00:21:16 1985
Date-Received: Fri, 29-Nov-85 21:43:26 EST
References: <7687@watrose.UUCP> <2796@watcgl.UUCP> <261@rtp47.UUCP>
Reply-To: josh@polaris.UUCP (Josh Knight)
Followup-To: net.arch
Organization: IBM Research, Yorktown Heights, N.Y.
Lines: 32
Keywords: emulation microcode
Xref: watmath net.micro:12892 net.arch:2195

In article <261@rtp47.UUCP> meissner@rtp47.UUCP (Michael Meissner) writes:

>It goes even further, since all of IBM's mainframes also include emulators for
>their previous machines (which I believe are the 704 and 1600).  Now adays,
>the IBM 3084 emulating an IBM 704, runs faster than the original machine.  Some
>of IBM's biggest customers run accounting programs written in the early 70's,
>for which there is no source available (or the source is all assembler).

Well...almost...

The last model for which 1401/1440/1460 and 1410/7010 compatibility was
available was the 370/158.  The last model for which 7070/7074, 7080 and
709/7090/7094 II compatibility was available was the 370/168.  Quite a
while ago, actually (mid 70's).  These features are not available on any
of the 303x, 308x or 3090 processors (reference "IBM System/370 Processor
Summary:  Processors", publication number GA22-7001).  I do keep seeing
adds for a product (can't remember the vendor, sorry :-) which purports
to convert 1401 autocoder (essentially 1401 assembly language) into COBOL.
Also, there may be software emulators (simulators?), but I don't know of
them.

I'm not very knowledgeable about this, but I think one might be able to
micro-code the 308x series processors for your critical 1401 applications,
call your IBM sales representative for a quote (-: (-:   :-) :-).

Any opinions (expressed or implied) or errors are mine and not my employer's.

-- 

		Josh Knight, IBM T.J. Watson Research
    josh at YKTVMH on BITNET, josh.yktvmh@ibm-sj on CSnet,
    ...!philabs!polaris!josh