[comp.sys.intel] Undocumented opcodes and hardware

chasm@killer.DALLAS.TX.US (Charles Marslett) (12/19/88)

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