6.27

A.

t = 0x45 = 0b01000101, s = 0b001, b = xx(xx is 00/01/10/11)

address may be

01000101 001 xx

format
0 1000 1010 01xx

address range: 0x08A4 - 0x08A7

t = 0x38

address range: 0x0704 - 0x0707

B.

0x1238 - 0x123B