Assembly Language for Beginners

5.10. LOOPS

BMP graphics files

BMPfilesarenotcompressed, soeachbyte(orgroupofbytes)describeseachpixel. I’vefoundthispicture
somewhere inside my installed Windows 8.1:

Figure 5.14:Example picture

You see that this picture has some pixels which unlikely can be compressed very good (around center),
but there are long one-color lines at top and bottom. Indeed, lines like these also looks as lines during
viewing the file:

Figure 5.15:BMP file fragment

5.10.2 Memory “snapshots” comparing.

The technique of the straightforward comparison of two memory snapshots in order to see changes was
often used to hack 8-bit computer games and for hacking “high score” files.