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INT 15h, C3h (196) Programmable Option Select (POS) PS/2
Interface to the Programmable Option Select (POS) of the Micro Channel.
AL = 0 Get Base POS Address
On entry: AH C4h
AL 00 . Get POS base address
Returns: For PCjr and PC:
AH = 80h, CF = 1
For PC XT, AT, XT 286, Convertible, PS/2 30:
AH = 86h, CF = 1
For All Others:
CF = 0 . Operation successful
AL = 0
DX = Base POS register address
= 1 . Operation unsuccessful
---------------------------------------------------------------------------
AL = 1 Enable Slot for Setup
On entry: AH C4h
AL 01 . Enable slot for setup
Returns: For PCjr and PC:
AH = 80h, CF = 1
For PC XT, AT, XT 286, Convertible, PS/2 30:
AH = 86h, CF = 1
For All Others:
CF = 0 . Operation successful
AL = 1
DX = Slot number
= 1 . Operation unsuccessful
---------------------------------------------------------------------------
AL = 2 Adapter Enable
On entry: AH C4h
AL 02 . Adapter enable
Returns: For PCjr and PC:
AH = 80h, CF = 1
For PC XT, AT, XT 286, Convertible, PS/2 30:
AH = 86h, CF = 1
For All Others:
CF = 0 . Operation successful
AL = 2
= 1 . Operation unsuccessful
---------------------------------------------------------------------------
This service provides a consistent interface to the Programmable Option
Select of the Micro Channel (MCA) in PS/2 models 50, 60, 70, and 80.
It is a special feature of the Micro Channel that you can now set in
software information that required dip switches before. For example, you
can enable or disable options in MCA slots. This service allows you to
take advantage of this new capability.
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