storage of data in memory

Question

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 am a new with these stuff so kindly help!

Answer 1

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 .