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From: dlow@hpspcoi.HP.COM (Danny Low)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: IBM's Game Port
Message-ID: <15090002@hpspcoi.HP.COM>
Date: 27 Jun 90 17:39:18 GMT
References: <WIZARD.90Jun24095555@chemstor.uoregon.edu>
Organization: HP Lovecraft Division
Lines: 21

>>Game port is another name for a joystick controller. For some strange
>>reason IBM reserved an "interrupt" location for a joystick on the PC.
>>Maybe it had something to do with Flight Simulator also being
>>a Microsoft product. :-)
>
>What interrupt location?  Checking the interrupt assignments for the PC
>(with 1 8259 interrupt controller) and the AT (with 2 8259 interrupt
>controllers cascaded on interrupt2), there is no assignment for the
>game port/joystick controller.  And there is no interrupt setting on
>none of my 2 joystick boards either.

Note that "interrupt" is in quotes. This is a common literary
convention to indicate that the actual meaning is NOT being used. 
Joysticks are not interrupt devices. There are just locations assigned 
in the I/O address space for the stick controller to put 
data for anyone to read.

			   Danny Low
    "Question Authority and the Authorities will question You"
	   Valley of Hearts Delight, Silicon Valley
     HP SPCD   dlow%hpspcoi@hplabs.hp.com   ...!hplabs!hpspcoi!dlow