storage of data in memory

i want to know, how will the data be stored in memory ; or what will be the affect of the following code

DATA1 DB 1,2,3

how does my data get stored.. if i am using a 80386 or above intel microprocessor.. i开发者_运维百科 am a new with these stuff so kindly help!

Well, db defines a sequence of bytes so you'll get the three bytes 1, 2 and 3 in increasing memory locations, starting at data1.

If data1 were at 0x00001234, the two statements db 1,2,3 and db 3,2,1 (that's one or the other, not one followed by the other) would give:

           DB 1,2,3          DB 3,2,1
           +------+          +------+
0x00001234 | 0x01 |          | 0x03 |
           +------+          +------+
0x00001235 | 0x02 |          | 0x02 |
           +------+          +------+
0x00001236 | 0x03 |          | 0x01 |
           +------+          +------+

For example, check out this debug session:

c:\src> debug

-a 100
1388:0100 db 1,2,3,4
1388:0104 db 9,8,7,6
1388:0108

-d 100 10f
1388:0100  01 02 03 04 09 08 07 06-00 00 00 00 00 00 00 00   ................

-q

c:\src> _

You can see that the 1, 2, 3 and 4 (in that order) go into memory locations 0x0100 through 0x0103 and the 9, 8, 7 and 6 (again, in the specified order) go into memory locations 0x0104 through 0x0107.