CALL 0060h:0003h - Eagle MS-DOS v1.25 IO.SYS - CHECK FOR KEYSTROKE              
InstallCheck:	MS-DOS v1.25 must be installed
Note:	does not return extended keystrokes
SeeAlso: @0060h:0000h,@0060h:0006h,@0060h:0027h


(Table F0001)
Call Eagle MS-DOS entry point 0003h with:
	nothing
Return: ZF set if no key
	ZF clear if keystroke available
	    AL = keystroke