PORTIBM PC Portable (uses same BIOS as XT) 210C-210F - XGA(Extended Graphics Array) Video Data (word/dword)
Note:	this port is for the first XGA(Extended Graphics Array) in the system; 211x-217x are used for
	  the second through eighth XGAs

210C  RW  byte data
210Cw RW  word data
210Cd RW  dword data