Example

1. 20-bit linear address: from 00000 to FFFFF, size (capacity) of the space = ?

	2^20 = 1MB

  Formula:  (end - start) + 1 = space

	
	(FFFFF - 00000) + 1 = 10 0000 (h)
	= 0001 0000 0000 0000 0000 0000 (b)
	= 2^20
	= 1 MB

	In MS-DOS, total memory space is 1MB

2. Interrupt vector table (IVT): 00000 - 003FF (h), size = ? (KB/MB)

	(003FF - 00000) + 1 = 400 (h)
	= 0100 0000 0000 (b)
	= 2^10 
	= 1 KB

	For MS-DOS, IVT is stored in the first kB of memory.
 

3. ROM BIOS: F0000 to FFFFF, size = ? (K)

	(FFFFF - F0000) + 1 = FFFF + 1 = 10000 (h)
	= 1 0000 0000 0000 0000 (b)
	= 2^16
	= 2^(10+6)
	= 2^6 * 2^10
	= 64 K

	In MS-DOS, ROM BOIS is located in the last 64k of memory space.


4. The memory linear address from 00000 to 9FFFF, what is the capacity?	

	9FFFF + 1 = A0000 (h)
	= 1010 0000 0000 0000 0000
	= 2^19 + 2^17
	= (2^9 + 2^7) * 2^10
	= 2^7(2^2+1) K
	= 640 K

5. Memory address from 0000 0000 to FFFF FFFF, what is the capacity?

	FFFF FFFF + 1 = 1 0000 0000 (h)
	= 1 0000 0000 0000 0000  0000 0000 0000 0000 (b)
	= 2^32
	= 2^2 * 2^30
	= 4G