Xref: utzoo comp.os.msdos.programmer:4908 comp.sys.ibm.pc.hardware:8106 comp.sys.ibm.pc.misc:9082
Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!lgc.com!mips.mitek.com!convex!linac!uwm.edu!csd4.csd.uwm.edu!markh
From: markh@csd4.csd.uwm.edu (Mark William Hopkins)
Newsgroups: comp.os.msdos.programmer,comp.sys.ibm.pc.hardware,comp.sys.ibm.pc.misc
Subject: Re: Keyboard controller
Keywords: PC, keyboard,keyboard controller
Message-ID: <11459@uwm.edu>
Date: 26 Apr 91 22:04:33 GMT
References: <1991Apr25.111900.4948@rci.dk>
Sender: news@uwm.edu
Followup-To: comp.sys.ibm.pc.programmer
Organization: University of Wisconsin - Milwaukee
Lines: 25

In article <1991Apr25.111900.4948@rci.dk> neh@rci.dk (Niels Erik Holm) writes:
>	mov	al,0A7h		; Unknown code ????
>	out	64h,al
>	mov	al,0ADh		; Disable keyboard
>	out	64h,al
>
>and
>
>	mov	al,0A8h		; Unknown code ????
>	out	64h,al
>	mov	al,0AEh		; Enable keyboard
>	out	64h,al

They're not used for AT's.  But if they match the PS/2 functions then they
mean:

A7: Disable auxilliary device.
A8: Enable auxilliary device.

If the system's keyboard controller's incompatible, it could accidentally mean

A7: Enable PC keyboard mode.
A8: Disable PC keyboard mode.

or who knows what.