   

xor AL, AL	;  
mov AL, 06h	;    06h
mov DX, 03CEh	;    
out DX, AL	;    
mov DX, 03CFh	;    
in AL, DX	;    
and AL, 01100b;   
cmp AL, 0	;  A0000h-BFFFFh (128 )
je MEM_128
cmp AL, 1	;  A0000h-AFFFFh (64 )
je MEM_64
cmp AL, 2	;  B0000h-B7FFFh (32 )
je MEM_32
cmp AL, 3	;  B8000h-BFFFFh (32 )
je MEM_32_2