Undocumented opcodes and hardware

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Article #1833

#1833

From: Charles Marslett
Date: Mon, 19 Dec 1988 15:06

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Does anyone know what any of the following "things" do and in
what machines in the MSDOS world they apply to:

    Undefined opcodes for 80x86 class processors:
       0F 07       -- presumably on 386s?
       0F A6 CA    -- maybe on 286s?

    Keyboard controller commands:
       DD
       DF

    I/O ports (note that they are 16-bit I/O addresses):
       3F00
       3F20
       3FA0

Thanks,
    Charles Marslett
    chasm@killer.dallas.tx.us

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!husc6!mailrus!ames!killer!chasm
From: chasm@killer.DALLAS.TX.US (Charles Marslett)
Newsgroups: comp.sys.intel
Subject: Undocumented opcodes and hardware
Keywords: Help machine specific I/O
Message-ID: <6491@killer.DALLAS.TX.US>
Date: 19 Dec 88 15:06:35 GMT
Organization: The Unix(R) Connection, Dallas, Texas
Lines: 20