PORTIBM PC Portable (uses same BIOS as XT) 0200-020F - Game port reserved I/O address space
0200-0207 - Game port, eight identical addresses on some boards

0201  R-  read joystick position and status (see #P0542)
0201  -W  fire joystick's four one-shots
0201  RW  gameport on mc-soundmachine, mc 03-04/1992: Adlib-compatible,
		Covox 'voice master' & 'speech thing' compatible soundcard.
		(enabled if bit1=1 in PORTIBM PC Portable (uses same BIOS as XT) 038Fh. Because it is disabled on
		power-on, it cannot be found by BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly.) (see PORTIBM PC Portable (uses same BIOS as XT) 0388h-038Fh)


Bitfields for joystick position and status:
Bit(s)	Description	(Table P0542)
 7	status B joystick button 2 / D paddle button
 6	status B joystick button 1 / C paddle button
 5	status A joystick button 2 / B paddle button
 4	status A joystick button 1 / A paddle button
 3	B joystick Y coordinate	   / D paddle coordinate
 2	B joystick X coordinate	   / C paddle coordinate
 1	A joystick Y coordinate	   / B paddle coordinate
 0	A joystick X coordinate	   / A paddle coordinate